Gossen MetraWatt METRAHIT IM E-DRIVE FUSO User manual

Operating Instructions
METRAHIT IM E-DRIVE FUSO
(M274F)
Insulation Tester,Milliohmmeter,
TRMS Multimeter,Inter-Turn Short Circuit Tester
3-447-176-72
1/7.23

2Gossen Metrawatt GmbH
Scope of Delivery (depending on instrument variant)
1 Multimeter with rubber holster
1HC40hardcase
(for multimeter and accessories) (Z270J: orange)
1 Quick-change, rechargeable lithium polymer battery (Z270G)
1 USB PD Power Pack (270U)
1 Micro USB Cable (Z270V)
1 Probe (with start/stop and store/send function) (Z270S)
1 Cable set (1 pair of safety measurement cables, red/black,
with 4 mm test tips) (GTY362003P0002)
1 KC&S Kelvin clip and Kelvin probe (Z227C)
1 DAkkS calibration certificate
1 Condensed operating instructions
* Comprehensive operating instructions available on the Internet
for download from www.gossenmetrawatt.com
1 IZYTRONIQ Business Starter
license (card with registration key
for software
Overview, Scope of Delivery
Key
X = standard
O = option
— = not possible, not intended
Overview of Included Features
1Due to system design, the DC component displayed in the smallest measuring range
(300 mV) has an offset. Select the VDC function for precise measurement of the DC
component.
2With optional temperature sensors
3For 300,000 measured values, sampling rate adjustable from 0.1 seconds to 9 hours
430 kA = minimum breaking capacity
Accessories (sensors, plug inserts, adapters, consumable materials)
The accessories available for your instrument are checked for
compliance with currently valid safety regulations at regular inter-
vals, and are amended as required for new applications. Currently
up-to-date accessories which are suitable for your measuring
instrument are listed on our website along with photo, order num-
ber, description and, depending upon the scope of the respective
accessory, data sheet and operating instructions:
www.gossenmetrawatt.de
Accessories Type Article
No.
M274
M
METRAHIT IM E-DRIVE FUSO M274F X
Quick-change, rechargeable
lithium polymer battery with
USB power pack M27x Z270G X
USB PD Netzteil 270U X
Micro-USB-Kabel 270V X
Probe with keys Z270S Z270S X
Cable set
KS17-2
GTY3620
03P0002 X
1 pair of Kelvin clips KC4 Z227A O
1 pair of Kelvin probes KC27 Z227B O
1 Kelvin clip &
1 Kelvin probe KC&S Z227C X
Concentric Kelvin probes for
4-wire measurement KCC Z227O O
Cable reel for 4-wire measure-
ment, 100 meters KCV100 Z227E O
Hard case
Orange HC40 Z270J X
Magnetic holder and
Velcro fastener
HIT-Clip Z117A O
COIL adapter, 10 μH … 50
mH
COIL TEST
ADAPTER Z270F O
COIL adapter, 10 μH … 5 H COIL ADAPTER
XTRA Z270M O
Set of test probes with
alligator clips for
COIL Adapter XTRA
KSC-3L Z110C O
Adapter cable, 4 mm plug
to 6 mm socket AK-4M/6F Z110L O
Adapter cable, 4 mm plug
to 8 mm socket AK-4M/8F Z110M O
Functions expansion to 16 test
sequences with up to 63 test
steps each
Sequence
functions
Expert
Z270P
X
IZYTRONIQ Business Starter li-
cense S101S & Z956A
S101S &
Z956A X
Function METRAHIT IM
E-DRIVE
FUSO
VDC (Ri 9 M)
VAC / Hz TRMS (Ri 9 M)
filter
VAC+DC TRMS (Ri 9 M) 1
filter
VAC+DC TRMS (Ri 1 M)
RISO range (interference voltage) 
Hz (VAC)… 300 kHz
VAC, AC+DC bandwidth 100 kHz
A DC, AC, AC+DC / Hz TRMS 10 nA … 1 A
Fuse F1, current measuring function 1 A/1000 V - 30
kA 4
Current sensor transformation ratio 1 mV : 1 • 10 •
100 • 1000 mA
Hz (A AC) … 30 kHz
Insulation resistance RISO: Test Voltages 50 • 100 • 250 •
500 • 1000 V
Inter-turn short circuit test (1 kV) with COIL adapter
Option
Duty cycle measurement as % 
RPM measurement 
Resistance Rlo with 200 mA per EN 61557 
Milliohm with 4-wire method, mwith 200 mA 
Milliohm with 4-wire method, mwith 1 A
pulse 
Fuse F2, Rlo measuring function 315 mA/1000 V –
30 kA 4
Resistance 
Continuity 
Diode … 4.5 V 
Temperature: °C/°F TC type K and Pt100/1000
2
Capacitance 
Min-Max / data hold 
Expert sequence functions 
64 MBit memory 3
Bluetooth®interface 
3.5" TFT color graphic display 
Probe with start/stop and send/store keys 
Quick-change battery with USB charging 
Protection IP 52
Measuring category 1000 V CAT III,
600 V CAT IV
1kHz
1kHz

Gossen Metrawatt GmbH 3
Contents Page Contents Page
1 Safety Instructions ............................................................ 5
2 Applications ....................................................................... 6
2.1 Intended Use / Use for Intended Purpose .................................... 6
2.2 Use for Other than Intended Purpose........................................... 6
2.3 Liability and Guarantee................................................................ 6
2.4 Opening the Instrument / Repairs................................................ 6
2.5 Manufacturer’s Guarantee........................................................... 6
3 Documentation .................................................................. 6
3.1 Product Variants .......................................................................... 6
3.2 Firmware Version......................................................................... 6
3.3 Symbols ....................................................................................... 6
4 Operating Overview ........................................................... 7
4.1 Connections, Keys, Rotary Switch, Symbols ............................... 7
4.2 Symbols Used in the Digital Display ............................................ 8
4.3 Rotary Switch Position Symbols ................................................ 9
4.4 Used Symbols .............................................................................. 9
5 Initial Startup................................................................... 10
5.1 Battery Pack .............................................................................. 10
5.2 Switching the Instrument On ..................................................... 11
6 System Settings .............................................................. 12
6.1 Digital Keyboard ........................................................................ 12
6.2 Firmware ................................................................................... 12
6.3 Language Selection ................................................................... 12
6.4 Time and Date Settings ............................................................. 13
6.5 Digital Display Settings.............................................................. 13
6.5.1 Brightness ................................................................................... 13
6.5.2 Display Profile.............................................................................. 13
6.6 Set Display of Leading Zeros ..................................................... 13
6.7 Configuring Password Protection .............................................. 13
6.7.1 Selecting or Changing a Password ................................................ 13
6.7.2 Deactivating Password Protection.................................................. 14
6.8 Viewing the Instrument’s Name................................................. 14
6.9 Installing a Functions Expansion ............................................... 14
6.10 Switching the Instrument Off..................................................... 14
6.10.1 Switching the Instrument Off Manually........................................... 14
6.10.2 Automatic Shutdown (auto-off)...................................................... 15
6.11 Default Settings (instrument reset)............................................ 15
7 Control Functions ............................................................16
7.1 Help............................................................................................ 16
7.2 Selecting Measuring Functions and Measuring Ranges............ 17
7.2.1 Automatic Range Selection ........................................................... 17
7.2.2 Manual Range Selection ............................................................... 17
7.2.3 Quick Measurements ................................................................... 17
7.3 Zero Offset / Relative Measurements ........................................ 17
7.4 Display (TFT) .............................................................................. 18
7.4.1 Digital Display .............................................................................. 18
7.4.2 Analog Display ............................................................................. 18
7.5 Measured Value Storage – Data Function
(Auto-hold/Compare) ................................................................. 18
7.5.1 Saving Minimum and Maximum Values – “MinMax”....................... 19
7.6 Measured Value Memory – STORE Function. ............................ 19
7.6.1 Remote read-out and storage via the Z270S probe ....................... 19
7.6.2 Remote Read-Out and Storage via the PC – PUSH/PRINT Function.. 20
7.7 Measurement Data Recording ................................................... 20
7.7.1 One-Time Only (manual) Storage................................................... 20
7.7.2 Measurement Series (automatic storage)....................................... 20
7.7.3 Memory....................................................................................... 22
8 Measurements.................................................................23
8.1 Enabling Parameter Changes .................................................... 23
8.2 Insulation Resistance Measurement – RISO Function .............. 23
8.2.1 Preparing for Measurement .......................................................... 23
8.2.2 Performing Insulation Measurement.............................................. 24
8.2.3 Ending the Measurement and Discharging..................................... 25
8.3 Inter-Turn Short Circuit Measurement – COIL Function ........... 25
8.3.1 Inter-Turn Short Circuit Measurement with the COIL TEST ADAPTER25
8.3.2 Inter-Turn Short Circuit Measurement with the ADAPTER XTRA ...... 28
8.4 Absorption Index Measurement – DAR...................................... 31
8.5 Polarization Index Measurement – PI ........................................ 32
8.6 Voltage Measurement................................................................ 33
8.6.1 Alternating Voltage and Frequency Measurement V AC
and Hz with Selectable Low-Pass Filter ......................................... 33
8.6.2 Duty Cycle Measurement – Duty AC.............................................. 34
8.6.3 RPM Measurement – RPM AC...................................................... 34
8.6.4 Direct and Pulsating Voltage Measurement, V DC and V (AC+DC)... 35
8.7 Resistance Measurement “” .................................................. 36
8.8 Capacitance Measurement F..................................................... 37
8.9 Temperature Measurement with Resistance Thermometers –
Temp RTD .................................................................................. 38
8.10 Temperature Measurement with Thermocouple – Temp TC ..... 39
8.11 Continuity Test .......................................................................... 40
8.12 Diode Testing with Constant Current of 1 mA .......................... 40
8.13 Milliohm Measurement – Rlo (2-wire measurement)................ 41
8.14 Milliohm Measurement – m/4 (4-wire measurement) ........... 42
8.14.1 Compensation of Cable Resistance ............................................... 42
8.14.2 Thermovoltage Compensation....................................................... 43
8.14.3 Milliohm Measurement with 200 mA or 20 mA DC [m
8.14.4 Milliohm Measurement with 1 A Pulsating Measuring Current
(automatic thermovoltage correction at 3 … 300 m)................... 44
8.15 Current Measurement................................................................ 45
8.15.1 Direct and Pulsating Current Measurement, Direct Connection, –
A DC and A (AC+DC) ................................................................... 45
8.15.2 Alternating Current and Frequency Measurement,
Direct Connection, – AAC and Hz.................................................. 46
8.15.3 Direct and Pulsating Current Measurement with
Current Clamp Sensor – ADC und A (AC+DC)................................ 47
8.15.4 Alternating Current Measurement with Current Clamp
Sensor – AAC and Hz................................................................... 48
8.16 Measuring Sequences – Test Sequences.................................. 49
9 Interface Operation and Software ...................................52
9.1 Bluetooth®................................................................................ 52
9.2 Software for Receiving and Evaluating Data ............................. 53
9.2.1 METRAHIT IM Data Reader (PC) ................................................. 53
9.2.2 Terminal Program (PC) ................................................................. 53
9.2.3 METRALOG App (smartphone and tablet)....................................... 54
9.2.4 Sequence Manager: Software for Test Sequences ....................... 54
10 Characteristic Values.......................................................57
11 Maintenance and Calibration...........................................61
11.1 Displays – Error Messages ........................................................ 61
11.2 Fuses ......................................................................................... 61
11.3 Housing Maintenance................................................................ 61
11.4 Measurement Cables................................................................. 61
11.5 Recalibration ............................................................................. 61
12 Accessories .....................................................................62
12.1 General ...................................................................................... 62
12.2 Technical Data for Measurement Cables
(included with KS17-2 cable set and Z270S probe) .................. 62

4Gossen Metrawatt GmbH
13 Returns and Environmentally Sound Disposal ................ 62
14 CE Declaration ................................................................ 63
15 Addresses ....................................................................... 64
15.1 Product Support .........................................................................64
15.2 Recalibration Service .................................................................64
15.3 Repair and Replacement Parts Service
Calibration Center * and Rental Instrument Service...................64

Gossen Metrawatt GmbH 5
1 Safety Instructions
Observe this documentation, in particular all included safety infor-
mation, in order to protect yourself and others from injury, and to
prevent damage to the instrument.
• Carefully and completely read and adhere to these operating
instructions, as well as the instrument’s condensed operating
instructions.
The respective documents can be found at http://www.gossen-
metrawatt.com. Retain these documents for future reference.
• Tests/measurements may only be performed by a qualified
electrician, or under the supervision and direction of a quali-
fied electrician. The user must be instructed by a qualified
electrician concerning performance and evaluation of the
tests/measurements.
• The multimeter may only be operated by persons who are
capable of recognizing touch hazards and taking the appro-
priate safety precautions. Touch hazards in accordance with
the standard prevail anywhere, where dangerous voltages
may occur. Avoid working alone when taking measurements
which involve touch hazards. Be certain that a second person
is present.
• Observe and comply with all safety regulations which are
applicable for your work environment.
• Wear suitable and appropriate personal protective equipment
(PPE) whenever working with the instrument.
• Use only the specified accessories (included in the scope of
delivery or listed as options) with the instrument.
• Carefully and completely read and adhere to the product doc-
umentation for optional accessories. Retain these documents
for future reference.
• Use the instrument in undamaged condition only.
• Inspect the instrument before use. Pay particular attention to
damage, interrupted insulation or kinked cables.
• Damaged components must be replaced immediately.
• Accessories and cables may only be used as long as they’re
fully intact.
• Inspect accessories and all cables and before use. Pay partic-
ular attention to damage, interrupted insulation or kinked
cables.
•Iftheinstrumentorits accessories don’t function flawlessly,
permanently remove the instrument/accessories from opera-
tion and secure them against inadvertent use.
• If the instrument or accessories are damaged during use, for
example if they’re dropped, permanently remove the instru-
ment/accessories from operation and secure them against
inadvertent use.
• Do not use the instrument and its accessories after long peri-
ods of storage under unfavorable conditions (e.g. humidity,
dust or extreme temperature).
• Do not use the instrument and its accessories after extraordi-
nary stressing due to transport.
• Only use the instrument and its accessories within the limits of
the specified technical data and conditions (ambient condi-
tions, IP protection code, measuring category etc.).
• Do not use the instrument in potentially explosive atmo-
spheres.
• The instrument must not be exposed to direct sunlight.
• The instrument and the accessories may only be used for the
tests/measurements described in the documentation for the
instrument.
• Maximum permissible voltage between the voltage measuring
sockets or all connector sockets and ground is 1000 V for
measuring category IIIand 600 V for measuring category IV.
• The multimeter may only be operated with installed recharge-
able battery pack or mains module. Dangerous current and
voltage are otherwise not indicated! The instrument may also
be damaged.
• Weak (undercharged) battery: Do not perform any safety-rele-
vant measurements if the “battery low” symbol appears in the
battery display. Moreover, compliance with the specified data
is no longer assured when the battery is weak.
• Be prepared for the occurrence of unexpected voltages at
devices under test (e.g. defective devices). For example,
capacitors may be dangerously charged.
• Do not perform any measurements in electrical circuits with
corona discharge (high-voltage).
• Dangerous pulsating voltages in HF electrical circuits! Use
caution when performing measurements there.
• Do not use the instrument if the fuse cover has been
removed. Touch contact with dangerous voltage is otherwise
possible.
• The instrument is equipped with fuses. The instrument may
only be used as long as the fuses are in flawless condition.
Defective fuses must be replaced.
• Plugging in the measurement cables must not necessitate any
undue force.
• Never touch conductive ends (e.g. of test probes).
• Fully unroll all measurement cables before starting a test/mea-
surement. Never perform a test/measurement with the mea-
surement cable rolled up.
• Ensure that alligator clips, test probes or Kelvin probes make
good contact.
•Theinstrumentisequipped with a Bluetooth®module. Deter-
mine whether or not use of the implemented frequency band
of 2.402 to 2.480 GHz is permissible in your country.
• Always create a backup copy of your measurement data.
Battery Pack
The instrument is powered by a rechargeable battery pack.
Observe the following points for this reason:
• Carefully and completely read and comply with the “supple-
mentary safety information sheet” for the Z270G battery pack
(3-447-030-51).
The manufacturer’s safety data sheet is included with the sup-
plementary sheet. Read and comply with this supplementary
sheet as well.
• The battery pack may not be exposed to direct sunlight
(whether it’s inside or outside of the instrument).
• Only charge the battery pack within a temperature range of
10 to 45 °C.
• Only store the battery pack within a temperature range of
-20 to 50 °C.
• Only operate the battery pack within a temperature range of
-10 to 50 °C.
• Risk in case of full depletion: In some cases it’s no longer pos-
sible to recharge a fully depleted battery pack (immediate fail-
ure), in which case it must be replaced. Full depletion may
also result in a shortened service life.
In order to prevent full depletion, charge the battery pack at
the mains at least once a year, but preferably at more fre-
quent, regular intervals.
• Transporting the battery pack:
Observe the “supplementary safety information sheet” for the
Z270G battery pack (3-447-030-51)!

6Gossen Metrawatt GmbH
2 Applications
Please read this important information!
2.1 Intended Use / Use for Intended Purpose
The METRAHIT IM E-DRIVE FUSO is a multimeter, milliohmmeter,
insulation measuring instrument, coil tester and data logger for
hybrid and electric drives.
It is a portable device which can be held in the hand during the
performance of measurements. It be used to perform the mea-
surements described in these operating instructions and in the
short-form operating instructions.
Performance characteristics: see “Overview of Included Features”
on page 2.
The multimeter is equipped with an automatic socket blocking
mechanism for your safety, and in order to safeguard your instru-
ment. This mechanism is linked to the rotary switch and only
allows access to those jacks which are actually required for the
selected function. It also prevents the user from turning the rotary
switch to impermissible functions after the measurement cables
have already been plugged in.
Safety of the operator, as well as that of the instrument, is only
assured when it’s used for its intended purpose.
Safety of the operator, as well as that of the instrument, is only
assured when it’s used for its intended purpose.
2.2 Use for Other than Intended Purpose
Using the instrument for any purposes other than those described
in the condensed operating instructions or these instrument oper-
ating instructions is contrary to use for intended purpose.
2.3 Liability and Guarantee
Gossen Metrawatt GmbH assumes no liability for property dam-
age, personal injury or consequential damage resulting from
improper or incorrect use of the product, in particular due to fail-
ure to observe the product documentation. Furthermore, all guar-
antee claims are rendered null and void in such cases.
Nor does Gossen Metrawatt GmbH accept any liability for data
loss.
2.4 Opening the Instrument / Repairs
The instrument may only be opened by authorized, trained per-
sonnel in order to ensure flawless, safe operation and to assure
that the guarantee isn’t rendered null and void. Even original
replacement parts may only be installed by authorized, trained
personnel.
When the instrument is opened, voltage conducting parts may be
exposed. The instrument must be disconnected from the measur-
ing circuit before performing repairs or replacing parts. If repair of
a live, open instrument is required, it may only be carried out by
trained personnel who are familiar with the dangers involved.
Unauthorized modification of the instrument is prohibited.
If it can be ascertained that the instrument has been opened by
unauthorized personnel, no guarantee claims can be honored by
the manufacturer with regard to personal safety, measuring accu-
racy, compliance with applicable safety measures or any conse-
quential damages.
If a guarantee seal is included and it has been damaged or
removed, all guarantee claims are rendered null and void.
2.5 Manufacturer’s Guarantee
All METRAHIT digital multimeters and calibration instruments are
guaranteed for a period of 3 years after date of shipment. The
manufacturer’s guarantee covers materials and workmanship.
Damages resulting from use for any other than the intended pur-
pose or operating errors, as well as any and all consequential
damages, are excluded.
The calibration certificate confirms that the product’s specified
technical data were complied with at the point in time of calibra-
tion. We guarantee compliance with the specified technical data
within the permissible tolerances for a period of 12 months after
delivery.
The guarantee can be extended to 5 years by registering free of
charge on the myGMC portal.
https://www.gmc-instruments.de/services/mygmc/
3 Documentation
3.1 Product Variants
Illustrations may differ from your instrument.
3.2 Firmware Version
These operating instructions describe an instrument based on
firmware version 1.006.003.
Complete information concerning your instrument’s firmware ver-
sion and updating can be found in section 6.2.
3.3 Symbols
The following symbols with the meanings listed below are used in
this documentation.
Danger Symbols
Warning concerning a point of danger
(attention, observe documentation!)
Warning concerning dangerous voltage at the measurement
input: U > 15 V AC or U > 25 V DC
Acoustic Warnings
High-voltage warning: > 1000 V (intermittent acoustic signal)
Very high amperage warning: > 1 A (continuous acoustic signal)
User Interface Symbols in the Following Sections
… Scroll through main menu
… Scroll through submenu
Select decimal point,
increase/decrease measuring range
 Increase/decrease value
(test voltage for insulation resistance measurement or
threshold for continuity test)
!

Gossen Metrawatt GmbH 7
4 Operating Overview
4.1 Connections, Keys, Rotary Switch, Symbols
METRAHIT IM E-DRIVE FUSO
2
3
4
1
5
6
8
section 4.2

section 7.6
section 5.1
section 4.3
13
max. 1000 V !
12
15
section 6.5 
14
section 
11
10
7section 4.4
9
1 Charge level LED (see section 5.1)
2 Display (TFT), see section 4.2 for meanings of symbols
3 Softkeys (menu-dependent keys for selecting switching functions and parameters, and for starting/ending measurements)
4STORE: Save key or push/print function for IZYTRONIQ
5OK: Key for acknowledgment and for restarting the instrument from the standby mode by pressing and holding
6Rotary switch
for measuring functions (see page 8 for meanings of symbols)
7 DAkkS calibration seal
8 Connector sockets for current measurement with automatic blocking
: ground input
A: current measurement input
9S+/S–: sense terminals for 4-wire measurements (m/4)
10 Extended connection for Z270S probe
(operating instructions 3-349-996-15)
11
Connector sockets for voltage measurement with automatic blocking
: ground input
V, , Temp,, ,
COIL measurement input
12 ESC:
Operating mode menu:
Press key briefly: Exit the menu level – jump back to a higher level, exit parameters entry without saving
Press and hold: The instrument is switched to the standby mode. Switch back on by pressing and holding the OK key.
13 MENU: Key for accessing the five main menus.
14 Scroll keys:
Increase parameter values
Operating mode menu: Selection of individual menu items
Decrease values
Operating mode menu: Selection of individual menu items
 Increase measuring range or move decimal point to the right ( Man function)
 Decrease measuring range or move decimal point to the left ( Man function)
15 Brightness sensor

8Gossen Metrawatt GmbH
4.2 Symbols Used in the Digital Display
1 Momentary measuring function
2 Memory symbol
3Important, in this case: Uext (interference voltage) or
warning regarding dangerous voltage: U > 15 V AC or U > 25 V DC
4 Battery pack charge level (see page 10)
5Bluetooth®activity indicator
6Func: switch back and forth amongst the functions of a given rotary
switch position
7Data MinMax: switch amongst “Data” (freeze measured value), “Min-Max
storage” and deactivate both functions
8Man Auto: switch back and forth between manual and automatic measur-
ing range selection
9 Display of the selected measuring range with manual measuring range
selection:
Select a lower measuring range
Select a higher measuring range
10 Selected test voltage
11 Select test voltage:
Select a larger test voltage
Select a smaller test voltage
12 Digital display with decimal point and polarity display
Measuring range exceeded: OL is displayed
13 Scale for analog display
14 Polarity selection
15 Zero: Zero balancing active
16 Start/Stop: For measurements which are not started automatically
17 Ip: test current
134
678
9
12
13
3
1110
1471516
17
16
REC
2
13
12
5

Gossen Metrawatt GmbH 9
4.3 Rotary Switch Position Symbols
1Clip = off
4.4 Used Symbols
See also “Recalibration” on page 61
Switches FUN
C
Display Measuring Function Additional Current Clamp Sensor Function  Clip = 1:1/10/100/1000
(via the “Setup for present measurement” menu)
RISO 0/4 RISO MInsulation resistance measurement
Uext
Pulsating voltage, TRMS DC + AC, 15 Hz … 500 Hz,
only for detection of interference voltage! (before starting
measurement)
Uset Selectable test voltage: 50, 100, 250, 500or 1000 V
UISO Applied/measured test voltage during measurement
Coil 1 Coil U-V, U-W, V-W [μs] Inter-turn short circuit test with optional coil adapter (COIL
TEST ADAPTER or COIL ADAPTER XTRA)
Coil 2DAR[k/s] Dielectric absorption rate
Coil 3PI[k/s] Polarization index
V~ 0/5 VAC Alternating voltage, AC TRMS, full bandwidth AC clamp (V): Current clamp sensor
Hz 1 Hz Voltage frequency, full bandwidth Hz clamp (V): Current clamp sensor
Hz 2 Duty AC %
Duty cycle measurement
Hz 3RPMAC RPM measurement
V~ 4VACFil Alternating voltage, AC TRMS, with low-pass filter (1 kHz)
V0/3 VDC 1Direct voltage DC clamp (V): Current clamp sensor
V1V(AC+DC)1
Mixed voltage, TRMS AC + DC clamp (V): Current clamp sensor
V2V(AC+DC)Fil1
Mixed voltage, TRMS AC DC, with low-pass filter (1 kHz)
0/4 (DC) resistance
1F, nF, F Capacitance
Temp RTD 2C Pt 100/1000
Temperature with Pt 100 / Pt 1000 resistance thermometer
Temp TC 3C, type K Temperature, type K thermocouple
0/2 Continuity test with acoustic signal
1V Diode voltage where I is constant
Rlo10RLO/2L 2-wire milliohm measurement where IP= /+/- 200 mA
m/4 0R
LO/4W 4-wire milliohm measurement where IP= 200 mA or 1 A
A0/4 A DC Direct current amperage
A1A(AC+DC)
Mixed current amperage, AC DC TRMS
A2 AAC Alternating current amperage, AC TRMS
A3 Hz Current frequency
VACDC VAC
2VDC 2
+=
Warning concerning a point of danger
(attention, observe documentation!)
Ground
CAT III / IV Measuring category III or IV device
Continuous, doubled or reinforced insulation
Indicates European Conformity
Fuse
This device, its electronic accessories, batteries and
rechargeable batteries may not be disposed of with the
trash. Further information regarding the WEEE mark can
be accessed on the Internet at www.gossenme-
trawatt.com under the search term WEEE (see also
section 13 ).
Japan MIC Bluetooth® Approval
Calibration seal (blue seal):
!
XY123
2019-09
D-K-
15080-01-01
Consecutive number
Registration number
Date of calibration (year – month)
Deutsche Akkreditierungsstelle GmbH – calibration lab

10 Gossen Metrawatt GmbH
5 Initial Startup
The instrument must first be supplied with power. The instrument
is powered by the rechargeable battery pack included in the
scope of delivery.
The rechargeable battery packis equipped with a patented, con-
tact-protected module socket, which makes replacement possi-
ble without interrupting the measuring circuit.
5.1 Battery Pack
A quick-change, rechargeable lithium polymer battery (Z270G)
with matching USB power pack, as well as a USB cable (micro
USB / type B), are included with the instrument.
Attention!
!
Observe safety information regarding the battery pack
(see section 1 on page 5)!
For initial startup, first charge the battery pack and then insert it
into the instrument.
The battery pack is subject to self-discharging at a rate of roughly
25% per year.
Note
Removing the Battery Pack during Periods of Non-Use
The integrated quartz movement draws power from the
battery pack even when the instrument is switched off.
It’s advisable to remove the battery pack before long peri-
ods of non-use for this reason (e.g. vacation). This pre-
vents excessive depletion, which may result in damage to
the lithium-ion batteries under unfavorable conditions.
Charging the Battery Pack
Attention!
!
The battery pack must be removed from the instrument
for charging (see “Removing the Battery Pack” on
page 10).
➭Connect the
USB cable to
the type B USB
port on the USB
power pack.
➭Connect the
USB cable to
the micro USB
port on the bat-
tery pack.
➭Plug the USB
power pack into
an electrical
outlet.
The charge LED
lights up yellow
during the charging
process. The
charging cable can
be removed as
soon as the charge LED lights up green at the end of the charging
process.
Charging takes approximately 2 hours.
Note
The optional M27x charger (Z270L) includes primary con-
nectors for Central Europe, the UK, North America and
Asia.
Inserting the Battery Pack
The battery pack has to be reinserted after charging.
➭Push the battery
pack into the battery
compartment on the
back of the instru-
ment until noticeable
resistance is de-
tected (a).
➭Press the two locking
tabs on the left and
right sides of the in-
strument together at
the same time (b) and
push the battery
pack to its final posi-
tion.
➭Release the locking
tabs. The battery
pack snaps into
place.
Removing the Battery Pack
Stored measurement data are not lost when the battery pack is
removed. Selected operating parameters are retained in memory.
Time and date, on the other hand, must be reset.
Attention!
!
Switch the instrument off and disconnect it from the
measuring circuit before removing the battery pack.
➭Simultaneously press
and hold the two
locking tabs (a).
➭Slide the battery
pack out towards the
top of the instrument
(b).
Battery Display
(charge level)
The current charge level
is indicated in the display at the top right (see “Connections, Keys,
Rotary Switch, Symbols” on page 7).
The exact charge level can be queried as a percentage under Info
in the General Setup menu:
➭Press the MENU key to this end.
➭Then press the General Setup softkey.
Select the Info parameter with the help of the  scroll keys.
Micro USB 5VDC,2A
Approx. 2 h
270A
USB Cable /
Power Pack
Z270G
a
b
b
Z270G
b
a
a
Z270G

Gossen Metrawatt GmbH 11
Charge level symbols:
5.2 Switching the Instrument On
➭The instrument is switched on automatically after selecting
any rotary switch position other than OFF.
Note
Electrical discharge and high frequency interference may
cause incorrect displays to appear, and may disable the
measuring sequence.
Disconnect the instrument from the measuring circuit. Switch
the instrument off and back on again in order to reset. If
this procedure is unsuccessful, briefly remove the battery
pack (see section 5.1 and section 5.2).
Battery full
Battery OK
Battery weak
Charge the battery pack as soon as possible.
Attention!
!
Do not perform any safety-relevant measure-
ments if the “battery low” symbol appears in
the battery display.
Moreover, compliance with the specified
data is no longer assured when the battery is
weak.
Battery (almost) dead, U < 3.3 V
Attention!
!
The instrument is switched off automatically:

12 Gossen Metrawatt GmbH
6 System Settings
After initial startup, basic system settings have to be selected, for
example date and time. System settings can be changed at any
time.
System settings can be accessed in the General Setup menu.
Note
If settings are selected which deviate from the default
configuration, e.g. “Bluetooth = On” or “Brightness =
Auto”, battery operating time may be less than specified
in the technical data.
6.1 Digital Keyboard
Text is entered at the instrument via a keyboard which appears at
the display:
Select the individual characters from the keypad using the scroll
keys. The position of the cursor is indicated by the green back-
ground at the respective key. Acknowledge the selected charac-
ter by pressing the OK key, after which the character is transferred
to the entry field. The last entered character or characters can be
deleted with the help of the BackSp (backspace) key. You can
move the blinking cursor in the entry field to the desired position
within the word using the <or >softkey in order to add charac-
ters, or to delete them with the help of the BackSp softkey. The
Shift softkey can be used to switch back and forth between upper
and lower case letters, as well as numbers and special charac-
ters. Finished entries are confirmed by pressing the Enter key.
6.2 Firmware
Viewing the Instrument’s Current Firmware Version
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the Info parameter with the help of the  scroll keys.
➭The Version parameter indicates the current software (firm-
ware) revision level.
➭The instrument is returned to the measuring mode after press-
ing the ESC key twice.
> General Setup >  Info > Version
Updating the Firmware
Complete information concerning current software and firmware,
as well as instrument updates and options, can be found in the
myGMC portal. Please register for free, after which you’ll have
access to the downloads and will always receive the latest infor-
mation about your instrument.
https://www.gmc-instruments.de/services/mygmc/
In order to update the firmware, download the current firmware as
a ZIP file and unpack it.
Attention!
!
Read and adhere to the README file.
It contains complete information on supported instru-
ments, system requirements, installation and version
changes.
Follow the instructions in the README file in order to install the
firmware update.
6.3 Language Selection
Japanese, English or German can be selected as the user inter-
face language.
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the Language parameter with the help of the  scroll
keys.
➭Switch to the settings menu with the help of the scroll key.
➭Select the desired language with the  scroll keys.
➭Acknowledge by pressing the OK key. The input cursor jumps
back to the parameters list.
➭Return to the main menu by pressing the ESC key or the MENU
key.
➭The instrument is returned to the measuring mode after press-
ing the ESC key once more.
> General Setup >  Language German/English/
Japanese
 2×
< > BackSp Enter
Entry Field Keypad
Shift
Entry Prompt
Entry field:
Delete
charac-
ters from
right
Entry field:
Accept
pass-
word from
entry field
Entry field:
Scroll left
Entry field:
Scroll
right
Keypad:
Switch
between
upper/
lower
case and
symbols Character Selection
within the Keypad
Transfer of the charac-
ter
from the keypad
to the entry field
MENU
MENU
OK
ESC

Gossen Metrawatt GmbH 13
6.4 Time and Date Settings
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the System parameter with the help of the  scroll
keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Date or Time parameter with the help of the 
scroll keys.
➭Acknowledge the selected parameter by pressing the OK key.
The entry cursor jumps to a random position in the settings
menu.
➭Select the desired entry position with the scroll keys and
change the respective value with the  scroll keys.
➭Acknowledge your change with the OK key. The entry cursor
once again marks the entire parameter line.
➭Return to the main menu by pressing the ESC key twice or the
MENU key once.
➭The instrument is returned to the measuring mode after press-
ing the ESC key once more.
> General Setup  System  Time
09:50:20 
3×
> General Setup  System  Date
13:06:2017 
3×
6.5 Digital Display Settings
Brightness and the display profile (light or dark mode) can be
selected for the display.
6.5.1 Brightness
Brightness of the digital display can be set between 1 (minimum
brightness) and 9 (maximum brightness).
It can also be set to automatic. In this case, digital display bright-
ness is adjusted depending on the intensity of the light which
strikes the brightness sensor.
> General Setup  System  Brightness:
1 … 9, Auto  3×
6.5.2 Display Profile
Two different views can be selected here – black lettering against
a bright background (light mode) or vice versa (dark mode).
> General Setup  System  Display Profiles:
Inverted or Normal 
3×
Default setting: White lettering against a dark background
6.6 Set Display of Leading Zeros
The Display Zeros parameter can be used to specify whether lead-
ing zeros will appear or be suppressed at the measured value dis-
play.
> General Setup  System  Display Zeros:
000.0 / 0.0  3×
6.7 Configuring Password Protection
No password is assigned upon delivery, or after restoring the
default settings.
A password can be selected if required. The following parameters
are then password protected:
• RISO: Changes to test voltage
(Test voltage remains permanently set after changing it with
the password.)
•M/4: Changes to test current
(The default setting is 200 mA. Test current is reset to this
value when the instrument is switched off.)
As long as the instrument remains switched on, the password
only needs to be entered once. It has to be entered again after
switching the instrument off.
Any password can be selected subject to the following restric-
tions:
Maximum length: 31 characters
Content: Any desired alphanumeric characters
The password is entered via the digital keyboard (see section 6.1
on page 12).
6.7.1 Selecting or Changing a Password
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the System parameter with the help of the  scroll
keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Change Password parameter with the help of the 
scroll keys.
➭Acknowledge the selected parameter by pressing the OK key.
Old Password appears in the header and the digital keyboard is
displayed.
➭If a password hasn’t been selected yet: Press the Enter soft-
key.
If a password has already been selected: Enter the password
via the digital keyboard.
➭Press the Enter softkey.
New Password appears in the header and the digital keyboard
is displayed.
➭Enter the (new) password.
➭Press the Enter softkey.
Acknowledge Password appears in the header and the digital
keyboard is displayed.
➭Enter the password again.
➭Press the Enter softkey.
The password has been set or changed.
➭The menu mode is exited by pressing ESC three times and the
instrument is returned to the measuring function.
> General Setup  System 
Changing the Password
MENU
OK
OK
ESC
MENU
OK
OK
ESC
MENU
OK
OK
ESC
MENU
OK
OK
ESC
MENU
OK
OK
ESC
MENU

14 Gossen Metrawatt GmbH
6.7.2 Deactivating Password Protection
A selected password can be deleted. Password protection is
deactivated as a result.
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the System parameter with the help of the  scroll
keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Change Password parameter with the help of the 
scroll keys.
➭Acknowledge the selected parameter by pressing the OK key.
Old Password appears in the header and the digital keyboard is
displayed.
➭Enter the password via the digital keyboard.
➭Press the Enter softkey.
New Password appears in the header and the digital keyboard
is displayed.
➭Press the Enter softkey without making any entry.
Acknowledge Password appears in the header and the digital
keyboard is displayed.
➭Press the Enter softkey again without making any entry.
The password is deleted. The menu mode is exited by press-
ing ESC three times and the instrument is returned to the mea-
suring function.
> General Setup  System 
Changing the Password
Note
If you forget your password, please contact our product
support department (see section 15.1).
6.8 Viewing the Instrument’s Name
Each instrument has its own name so that several instruments
can be distinguished from one another. The name consists of
“MetraHit IM” and the last two elements of the instrument’s hard-
ware address.
The instrument’s name must be known in order to be able to
identify it, for example when it’s connected to a PC.
The name cannot be changed.
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the Interface parameter with the help of the  scroll
keys.
➭The Name parameter specifies the instrument’s name.
➭The instrument is returned to the measuring mode after press-
ing the ESC key twice.
> General Setup  Interface  Name
6.9 Installing a Functions Expansion
You can purchase additional functions. Available functions expan-
sions can be found under “Included Features” and “Scope of
Delivery” on page 2, and in the data sheet which also contains the
order information.
After concluding your purchase, you’ll receive a feature key (pass-
word) which is used to enable your additional functions. The fea-
ture key has to be entered at the instrument.
Attention!
!
When ordering, specify the serial number of the instru-
ment for which you would like to purchase the functions
expansion. The feature key can only be used with this
one specific instrument.
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the System parameter with the help of the  scroll
keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Feature activation parameter with the help of the 
scroll keys.
➭Acknowledge by pressing the OK key.
A list of possible function expansions appears. Additional
functions which have not been enabled are identified in the list
by means of a red padlock.
➭Select the previously purchased function expansions with the
help of the  scroll keys.
➭Press the Activate softkey.
Password appears in the header and prompts you to enter your
feature key.
➭Enter the feature key using the digital keyboard. The digital
keyboard is described in section 6.1, “Digital Keyboard” on
page 13.
➭Acknowledge your entry by pressing the Enter softkey,
➭Successful enabling is confirmed by a message. The enabled
additional functions are then identified in the list by means of a
green checkmark.
> General Setup  System  Feature activation
6.10 Switching the Instrument Off
The instrument can be switched off manually. The instrument
switches itself off automatically as well (auto off).
6.10.1 Switching the Instrument Off Manually
➭The instrument is switched off automatically by setting the ro-
tary switch to the OFF position. The display goes blank.
MENU
MENU
MENU

Gossen Metrawatt GmbH 15
6.10.2 Automatic Shutdown (auto-off)
The period of time after which the instrument is shut down auto-
matically, regardless of whether a measurement or menu view is
open, can be set to a value within a range of 10 to 59 minutes.
Alternatively, automatic shutdown can be deactivated for continu-
ous operation.
The instrument is switched off automatically if the measured value
remains unchanged for a long period of time (maximum measured
value fluctuation of approx. 0.8% of the measuring range per min-
ute or 1C or 1 F per minute), and if none of the keys or the
rotary switch have been activated before a selected period of time
in minutes has elapsed.
Note
Exceptions:
Transmission and memory mode operation, continuous
operation and whenever a dangerous voltage is applied
to the input (U > 15 V AC or U > 25 V DC).
Shutdown is acknowledged with a brief acoustic signal.
> General Setup  System  Auto-OFF:
10 … 59 min/Off 
3×
6.11 Default Settings (instrument reset)
All of the settings which you have changed can be returned to
their default settings here.
Note
Password protection is also reset, i.e. deactivated.
Note
Test sequences (see section 8.16 on page 49) are
retained.
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the System parameter with the help of the  scroll
keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Default Settings parameter with the help of the 
scroll keys.
➭Acknowledge by pressing the OK key.
➭The following warning appears: “Reset?”. The settings are not
reset until you scroll to Yes with the scroll key and acknowl-
edge by pressing OK. Resetting can be aborted by scrolling to
No with the scroll key and pressing OK.
> General Setup  System  Default Settings:
Yes/No prompt 
3×
MENU
OK
OK
ESC
MENU
OK
OK
ESC

16 Gossen Metrawatt GmbH
7 Control Functions
7.1 Help
The following information can be displayed for switch positions
and basic functions after they’ve been selected with the rotary
selector switch:
• Explanation of the measurement
• Measuring ranges
• Wiring diagram
• QR code link for accessing the operating instructions
➭Press the MENU key to this end.
➭Then press the “Help for present measurement” softkey.
Comments concerning the measurement are displayed.
➭The measuring ranges and test voltages (2/4) are displayed by
pressing the 1/2 softkey.
➭The wiring diagram (3/4) is displayed by pressing the 2/4 soft-
key.
➭The QR code (4/4) is displayed by pressing the 3/4 softkey.
➭You can return to the help text (1/4) by pressing the 4/4 soft-
key.
➭The display is returned to the menu by pressing the ESC key
once.
➭The display can be returned to the measurement by pressing
the ESC key twice.
1/4
2/4
ESC
3/4
4/4

Gossen Metrawatt GmbH 17
7.2 Selecting Measuring Functions and Measuring Ranges
7.2.1 Automatic Range Selection
The multimeter is equipped with auto-ranging for all measuring
functions except for temperature measurement, as well as diode
and continuity testing. Auto-ranging is active as soon as the in-
strument is switched on. The instrument automatically selects the
measuring range which allows for highest possible resolution of
the applied quantity. When the instrument is switched to fre-
quency measurement, the previously selected voltage measuring
range remains active.
AUTO-Range Function
The multimeter is switched automatically to the next higher range
at (3099 d + 1 d 0310 d), and to the next lower range at
(280 d – 1 d 2799 d).
In the case of high resolution (available depending upon measur-
ing function), the multimeter is switched automatically to the next
higher range at (30,999 d + 1 d 03100 d), and to the next
lower range at (2800 d – 1 d 27,999 d).
7.2.2 Manual Range Selection
Auto-ranging can be deactivated and measuring ranges can be
selected manually in accordance with the following table by
pressing the Man / Auto button.
The desired measuring range can then be selected with the or
scroll key.
The instrument is automatically returned to automatic range se-
lection when the Man / Auto key is pressed, the rotary switch is ac-
tivated or the instrument is switched off and back on again.
Overview: Auto-Ranging and Manual Range Selection
* Only via manual range selection for V AC
The multimeter is held in the selected measuring range. If the
range limit is exceeded, “OL” appears at the display. You should
then switch to the next higher measuring range with the help of
the scroll key.
7.2.3 Quick Measurements
Measurements performed using a suitable fixed measuring range
are executed more quickly than those which utilize automatic
range selection. Quick measurement is made possible with the
following two functions:
•Manual measuring range selection, i.e. by selecting the measuring
range with the best resolution (see section 7.2.2)
or
•WiththeDATA function (see section 7.5) In this way, the appro-
priate measuring range is selected automatically after the first
measurement and the second measurement is executed more
quickly.
The selected measuring range remains active for the subsequent
series of measurements with these two functions.
7.3 Zero Offset / Relative Measurements
Zero offset or a reference value for relative measurements can be
stored to memory depending upon deviation from the zero point:
The relevant reference or correction value is deducted individually
for the respective measuring function as an offset from all future
measurements and remains in memory until deleted, or until the
multimeter is switched off.
Zero balancing and reference value adjustment can be used with
auto-ranging, as well as for manual measuring range selection.
Note:
Zero offset is available for the following measuring functions and
switch positions: RISO, Coil, DAR, PI, Hz, Duty AC, RPM AC, ,
Temp RTD (the RLeads function is offered here as an alternative),
Temp TC, Continuity, Diode, RLO/2L (ZERO is also activated after
pressing the START key!) and RLO/4W (the thermal compensation
function is offered here as an alternative).
Zero Balancing
➭Plug the measuring cables into the instrument and connect
the free ends to each other, except for capacitance measure-
ment and current measurement in which case the ends of the
cables are not connected to each other.
➭Briefly press the Zero softkey.
The value measured at the moment the key is pressed serves
as a reference value. The instrument acknowledges zero bal-
ancing with an acoustic signal, and “Zero” and the reference
value appear at the display. The Zero softkey is displayed with
a green background.
➭Zero balancing can be cleared by once again pressing the
Zero softkey.
Note
As a result of TRMS measurement, the multimeter dis-
plays a residual value of 1 to 10/35 digits with short-cir-
cuited measurement cables as the zero point for V AC /
I AC or V (AC+DC) / I (AC+DC) measurements (non-lin-
earity of the TRMS converter). This has no influence on
specified accuracy above 1% of the measuring range (or
3% in the mV, V (AC+DC) ranges).
Setting the Reference Value
➭Connect the measuring cables to the instrument and measure
a reference value (max. 50% of the measuring range).
➭Briefly press the Zero softkey.
The instrument acknowledges storage of the reference value
with an acoustic signal and the “ZERO” symbol appears at the
display. The value measured at the moment the key is
pressed serves as a reference value.
➭The reference value can be cleared by once again pressing
the Zero softkey.
Notes Regarding Relative Measurement
• Relative measurement effects the digital display only.
The analog display continues to read out the original mea-
sured value.
• In the case of relative measurement, F or AC quantities may
also appear as negative values.
Function Display
Man /
Auto
Manual mode active:
utilized measuring range is fixed Man
or 
Range switching sequence for:
V: 300 mV*
 3 V  30 V  300 V  1000 V
Hz: 300 Hz
 3 kHz  30 kHz  300 kHz (Hz(U))
:
300   3 k   30 k   300 k   3 M   30 M 
A:
300  A  3 mA  30 mA  300 mA  1 A
A:0.3A  3 A  30 A  300 A
F:
30 nF  300 nF  3  F  30  F  300  F
RISO: 300 k   3 M   30 M   300 M   3000 M 
Man
Man /
Auto Return to automatic measuring range selection Auto
Deviation from zero point
– with short-circuited measurement cables for V, , A
– with open input for capacitance unit of measure F
Display
0 … 200 digits ZERO

18 Gossen Metrawatt GmbH
7.4 Display (TFT)
7.4.1 Digital Display
Measured Value, Unit of Measure, Type of Current, Polarity
The measured value with correct decimal and plus or minus sign
appears at the digital display. The selected unit of measure and
current type are displayed as well. A minus sign appears to the
left of the value during the measurement of zero-frequency quan-
tities, if the plus pole of the measured quantity is applied to the
“” input.
The Display Zeros parameter can be used to determine whether
leading zeros will appear or be suppressed at the measured value
display (see section 6.6).
Exceeded Measuring Range
If the upper range limit of 1000 digits is exceeded, “OL” (overload)
appears at the display.
Exceptions: “OL” appears at the display as of 1030.0 V in the
case of voltage measurement in the 1000 V range, as of 4.500 V
for diode testing and as of 1.100 A in the 1 A range.
7.4.2 Analog Display
Measured Value, Polarity
The analog display emulates the dynamic performance of a mov-
ing-coil mechanism. This display is especially advantageous for
observing measured value fluctuation, and for balancing proce-
dures.
Display as a horizontal (green) bar which indicates the momentary
measured value in real-time.
The analog scale displays a small negative range for the measure-
ment of zero-frequency quantities with positive measured values,
allowing for precise observation of measured value fluctuation
around zero. If the measured value exceeds a certain negative
range, polarity is reversed at the analog display.
The analog scale displays a small positive range for the measure-
ment of zero-frequency quantities with negative measured value,
allowing for precise observation of measured value fluctuation
around zero in this case as well.
Scaling of the analog scale is automatic. This is very helpful for
manual measuring range selection.
Exceeded Measuring Range
Exceeding the measuring range is indicated exclusively via the
digital display.
Refresh Rate
The analog display is refreshed 40 times per second.
7.5 Measured Value Storage – Data Function
(Auto-hold/Compare)
General
An individual measured value can be automatically “frozen” with
the DATA function (auto-hold).
Applications
This function is useful, for example, when contacting the measur-
ing points with the test probes requires your full attention. After
the measuring signal has been applied and the measured value
has settled in in accordance with the “condition” listed in the table
below, the measured value is frozen at the digital display and an
acoustic signal is generated. The test probes can now be
removed from the measuring points and the measured value can
be read from the digital display. If the measuring signal falls below
the value specified in the table, the function is reactivated for stor-
age of the next value.
The Data function can be activated in all measuring functions. This
is possible for the following functions after measurement has
been started: RISO, RLO/2L and RLO/4L.
Procedure
Apply the measured quantity to the instrument and set the mea-
suring range with the Man / Auto softkey before activating the Data
function with the Data / MinMax softkey. Man appears at the display
with a green background. After activating the Data function with
the corresponding softkey, Man is grayed out and cannot be
changed until Data / MinMax is pressed again three times for deac-
tivation. Data appears at the display with a green background. If
automatic measuring range selection was active prior to activation
of the Data function, switching to manual measuring range selec-
tion is also disabled as long as the MinMax function is active.
Data and the associated value appear between the digital and
analog displays.
Measured Value Comparison (DATA Compare)
If the currently frozen value deviates from the first saved value by
less than 100 digits, the acoustic signal is generated twice. If devi-
ation is greater than 100 digits, only a brief acoustic signal is gen-
erated.
Note
The Data function has no effect on the analog display, at
which the current measured value continues to appear.
However, when the digital display is “frozen”, the decimal
point is fixed as well (fixed measuring range, Man appears
with a gray-green background).
The selected measuring range cannot be manually
changed as long as the Data function is active.
The Data function is deactivated by briefly pressing the Data / Min-
Max softkey three times, if you switch to the MinMax function,
when the measuring function is changed or when the instrument
is switched off and back on again.
V, A, Hz
t [s]
100%
10%
Activated Reactivated
Save Save
3000 digits
of measuring range
F, %

Gossen Metrawatt GmbH 19
1Reactivation results from falling short of specified measured value limits.
2Two acoustic signals are generated the first time a measured value is saved as a reference value.
For subsequent data hold, two acoustic signals are only generated if the currently frozen value
deviates from the first saved value by less than 100 digits.
Key: MV = measured value, MR = measuring range
Example
The voltage measuring range is set manually to 30 V.
The first measured value is 5 V and is stored to memory because
it’s greater than 10% of the measuring range (= 3 V), and is thus
reliably above the background noise level. As soon as the mea-
sured value drops to less than 10% of the measuring range, i.e.
amounts to less than 3 V which corresponds to removal of the
test probes from the measuring point, the instrument is ready to
store a new value.
7.5.1 Saving Minimum and Maximum Values – “MinMax”
General
Minimum and maximum measured values applied to the measur-
ing instrument’s input after the MinMax function has been acti-
vated can be “frozen” at the display.
Applications
The most important use of this function is the determination of
minimum and maximum values during long-term measured value
observation. The MinMax function can be activated in all measur-
ing functions. This is possible for the following functions after
measurement has been started: RISO, RLO/2L and RLO/4L.
The MinMax function has no effect on the analog display, at which
the current measured value continues to appear.
Procedure
Apply the measured quantity to the instrument and set the mea-
suring range with the Man / Auto softkey before activating the Min-
Max function with the Data / MinMax softkey. Man appears at the
display with a green background. After activating the MinMax
function with the corresponding softkey, Man is grayed out and
cannot be changed until MinMax is pressed again for deactivation.
MinMax appears at the display with a green background. If auto-
matic measuring range selection was active prior to activation of
the MinMax function, switching to manual measuring range selec-
tion is also disabled as long as the MinMax function is active.
Both Min and Max, as well as the associated values, are displayed
between the digital and analog displays along with the time of
their occurrence.
The MinMax function is deactivated by briefly pressing the Data /
MinMax softkey, when the measuring function is changed or when
the instrument is switched off and back on again.
Note
As opposed to the Data function, the MinMax function can
also be used for temperature measurement.
The MinMax function is reset by pressing the ESC key.
After pressing Data / MinMax once again, the minimum and maxi-
mum values are displayed together with the average value
(“Avg.”). The Min Avg Max display appears without timestamp.
7.6 Measured Value Memory – STORE Function.
The following options are available for the storage of measured
values:
• Store at the instrument by pressing the STORE key on the
instrument
• Store at the instrument by pressing the STORE key on the
probe
• Store at the PC by triggering the PUSH/PRINT function in the
IZYTRONIQ report generating program
7.6.1 Remote read-out and storage via the Z270S probe
The probe with integrated control unit permits remote triggering at
difficult to access places, and at locations which require your full
attention. The probe can be used for all measuring functions
except for current measurement. The connector cable is shielded
against interference.
➭Connect the probe’s double plug to the voltage socket (V).
➭Connect the KS17-2 safety measurement cable to the ground
socket.
➭Establish contact with the measuring point.
➭Start the respective measuring function by pressing the START
key on the probe.
➭As soon as the measured value has settled in, it can be stored
by pressing the STORE key on the probe.
Alternatively, the measured value can be stored with the help
of the STORE key on the instrument.
The REC storage symbol appears briefly in the header in order to
visualize the storage process.
Function
Data
Key
Data /
MinMax
Condition Response from Instrument
Measuring
Function
Measuring
Signal
Display Acous-
tic
Data + MV
Activate short is
displayed 1 ×
Save
(stabilized
measured
value)
V, A, F, Hz,
%
> 10%
MR is
displayed
1 ×
2 × 2
 0L
Reactivate 1
V, A, F, Hz,
%
< 10%
MR stored MV
 = 0L
Change to
MinMax short is
cleared 1 ×
Function
MinMax
Key
Data /
MinMax
Min. and Max.
Measured Values
Response from Instrument
Display Acoust
ic Sig-
nal
Min + MV
Max + MV
Activate
and save short are saved momentary
measured value 1 ×
Save and
display
Storage continues in
background, new min. and
max. values are displayed.
stored min. value 1 ×
stored max. value 1 ×
Stop short are deleted is cleared 1 ×
START
STORE
Test T ip
Safety Cap
Safety Collar
Z270S
REC S– A
V
Temp m/4
COIL
S+
KS17-2

20 Gossen Metrawatt GmbH
Electrical Safety
Measurements per DIN EN 61010-031 may only be performed in
environments in accordance with measuring categories III and IV
with the safety cap attached to the control unit’s test tip.
In order to establish contact inside 4 mm sockets, the safety cap has
to be removed by prying open the snap fastener with a pointed
object (e.g. the other test probe).
7.6.2 Remote Read-Out and Storage via the PC – PUSH/PRINT
Function
The procedure for storage via the PUSH/PRINT function is described in
the online help included with IZYTRONIQ report generating software.
7.7 Measurement Data Recording
The multimeter offers the option of saving measurement data
once by pressing a button or repeatedly as a measurement series
over longer periods of time.
Data are stored to a battery-backed memory module, and are
retained even after the multimeter is switched off. The system
acquires measured values relative to real-time.
Note
Measurement data recording is ended automatically as
soon as internal memory is full.
No measurement data are overwritten. Memory has to be
cleared in order to record further measurement data (see
page 22).
Stored measurement data can be read out via Bluetooth . See
also interface operation in section 9 on page 52.
Refer to section 7.6 on page 19 concerning storage of current
data to IZYTRONIQ software.
7.7.1 One-Time Only (manual) Storage
The STORE key is used for on-time only storage of a data value.
Recording type must be set to “Data Value”.
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the Memory menu with the  scroll keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Recording Type parameter with the help of the 
scroll keys.
➭Acknowledge the selected parameter by pressing the OK key.
➭ Select the Data Value parameter with the help of the  scroll
keys.
➭Acknowledge your change with the OK key. The entry cursor
once again marks the entire parameter line.
> General Setup  Memory  Recording Type
Data Value
3×
7.7.2 Measurement Series (automatic storage)
Recording type must first be set to “Periodic” for measurement
series, and several basic parameters have to be set, for example
the sampling rate.
Note
Consider available memory space when selecting your
settings (see page 22).
Afterwards, you can start memory mode operation and then the
measuring function at any time.
The general procedure is described here first, and the following
subsections explain the respective parameters and their configu-
ration in detail.
➭Activate recurrent recording:
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the Memory menu with the  scroll keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Recording Type parameter with the help of the
 scroll keys.
➭Acknowledge the selected parameter by pressing the OK
key.
➭Select the Periodic parameter with the help of the 
scroll keys.
➭Acknowledge your change with the OK key. The entry cur-
sor once again marks the entire parameter line.
➭Set the sampling rate for memory mode operation (see
page 21).
➭Set recording time (see page 21).
➭Select an hysteresis in order to assure efficient use of memory
capacity (see page 21).
➭Select a trigger function if required (see page 21).
➭Create a group if necessary in order to store the measured
values in a sorted manner (see page 22).
➭Check current memory occupancy (see page 22).
➭Before starting lengthy measured value recordings, check the
battery’s charge level (see section 5.1).
➭Start recording.
➭Press the MENU key.
➭Press the General Setup softkey.
➭Select the Memory menu with the  scroll keys.
➭Switch to the submenu with the help of the scroll key.
➭Select the Recording Start parameter with the  scroll
keys.
➭Acknowledge the selected parameter by pressing the OK
key.
The “Start” setting changes to “Stop”.
The following message appears: “Recording has started.”
At the same time, “REC” appears in red to the left of the
battery level display.
➭The display is returned to the measuring function by
pressing the ESC key three times.
Maximum rated voltage 300 V 600 V 600 V
Measuring category
CAT IV CAT III CAT II
Maximum rated current 1 A 1 A 16 A
With safety cap attached —
Without safety cap — — 
MENU
OK
ESC