Gossen MetraWatt METRAHIT PM PRIME User manual

METRAHITPM PRIME & METRAHITPM PRIME BT
Professional Multimeters / High Resolution TRMS Digital Multimeters
Operating Instructions
3-349-684-03
17/7.23

2Gossen Metrawatt GmbH
Scope of Delivery
Scope of Delivery
1Multimeter
1 KS17-2 measurement cable set
2 Batteries 1.5 V, type AA
1 DAkkS calibration certificate
1 Rubber holster
1 Condensed operating instructions *
* Detailed operating instructions are available for download on the Internet
at www.gossenmetrawatt.com
Included Functions
1
16 Mbit = 2048 kByte = 300,000 measured values,
sampling rate adjustable from 0.1 seconds to 9 hours
Function METRAHIT PM PRIME (M248A)
METRAHIT PM PRIME BT ( M248B)
Voltage, VDC (Ri 10 M) ✔
Voltage, VAC TRMS (Ri 5 M) ✔
Voltage, VAC+DC TRMS (Ri 5 M) up to 300 kHz
Frequency, Hz @ VAC @ VAC+DC @ VAC @ VAC+DC
1 kHz low-pass filter 100 kHz
Bandwidth @ VAC+DC or VAC 1 Hz to 1 MHz
Pulse frequency, MHz @ 5 V TTL 2,0 % to 98 %
Duty cycle as % @ VAC @ VAC+DC
Voltage level measurement, dB ✔
Resistance, ✔
Continuity test, ICONST = 1 mA ✔
Diode test, I
CONST
= 1 mA Typ K
Temp. measurement C/F @ TCPt100/Pt1000
Temp. measurement C/F RTD ✔
Capacitance measurement, F 300 mA/3 mA
30 mA/300 mA
3 A / 10 A (16 A)
Current, ADC
Current, AAC+DC TRMS
Current, AAC TRMS 10 kHz
Bandwidth @ AAC+DC or AAC up to 30 kHz
Frequency, Hz @ AAC @ VAC+DC mV / A
mA / A
Current clamp measurement with
adjustable transformation ratio 16 MBit (2 MB)
Data logger function 1(memory) ✔
Relative value measurement REL ✔
Zero point ✔
Min / Max / Data Hold ✔
IR interface (38.4 kBd) METRAHIT PM PRIME BT only
(M248B)
Bluetooth interface (38.4 kBd) ✔
Power pack socket ✔
Rubber holster 10 A / 1000 V
Fuse IP52
Protection 600 V CAT III
300 V CAT IV
Measuring category ✔
DAkkS Calibration Certificate METRAHIT PM PRIME (M248A)
METRAHIT PM PRIME BT ( M248B)
Function METRAHIT PM PRIME (M248A)
METRAHIT PM PRIME BT ( M248B)

Gossen Metrawatt GmbH 3
Contact Persons
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 in-
strument are listed at the following web address along with photo,
order number, description and, depending upon the scope of the
respective accessory, data sheet and operating instructions:
www.gossenmetrawatt.com
See also section 14 on page 70.
Contact, Support and Service
Gossen Metrawatt GmbH can be reached directly and simply –
we have a single number for everything! Whether you require sup-
port or training, or have an individual inquiry, we can answer all of
your questions here:
Do you prefer support by e-mail?
Enquiries concerning training and seminars can also be submitted
by e-mail and online:
[phone]
Monday to Thursday:
Friday:
8 a.m. to 4 p.m.
8 a.m. to 2 p.m.
Or contact us by e-mail at:
[email protected]
Measuring and Test
Tech nology:
[e-mail]
Industrial Measuring
Tech nology:
support.industrie@gossenmetra-
watt.com
[email protected]
https://www.gossenmetrawatt.com/training

4Gossen Metrawatt GmbH
Scope of Delivery
Please contact GMC-I Service GmbH for repairs, replacement
parts and calibration1) :
Software Enabling for METRAwin10
Please contact us directly (see page 3).
[phone] Beuthener Str. 41
90471 Nürnberg
Germany
[email protected]
www.gmci-service.com
1) DAkkS calibration laboratory per DIN EN ISO/IEC 17025 –
accredited by the Deutsche Akkreditierungsstelle GmbH under
reference number D-K-15080-01-01.

Gossen Metrawatt GmbH 5
Table of Contents
Content Page Content Page
1 Safety Instructions ..............................................................7
2 Application ........................................................................10
2.1 Intended Use / Use for Intended Purpose ......................................... 10
2.2 Use for Other than Intended Purpose ............................................... 10
2.3 Liability and Guarantee ................................................................... 10
3 Documentation ..................................................................11
3.1 Meanings of Danger Symbols ......................................................... 11
3.2 Meanings of Acoustic Warning Signals ............................................ 11
4 Operating Overview – Connections, Keys, Rotary Switch,
Symbols
............................................................................12
5 Initial Start-Up ................................................................... 16
5.1 Establishing Electrical Power Supply ............................................... 16
5.2 Switching the Instrument On ........................................................... 16
5.3 Setting the Operating Parameters ................................................... 17
5.4 Switching the Instrument Off .......................................................... 17
6 Control Functions .............................................................. 19
6.1 Selecting Measuring Functions and Measuring Ranges .................... 19
6.1.1 Automatic Range Selection ............................................................. 19
6.1.2 Manual Measuring Range Selection ................................................ 20
6.1.3 Quick Measurements ..................................................................... 20
6.2 Zero Offset / Relative Measurements .............................................. 20
6.3 Display (LCD) ................................................................................. 21
6.4 Measured Value Storage: DATA (auto-hold / compare) ..................... 22
6.4.1 Saving Minimum and Maximum Values – Min/Max Function ............. 23
6.5 Measurement Data Recording ........................................................ 24
6.5.1 Long-Term Recording .................................................................... 24
6.5.2 Storage of Individual Values using the SAMPLE or dAtA Sampling
Rate ............................................................................................. 26
7 Measurements ..................................................................27
7.1 Voltage Measurement .................................................................... 27
7.1.1 Direct and Pulsating Voltage Measurement, V DC and V (DC+AC) ..... 28
7.1.2 Alternating Voltage and Frequency Measurement V AC and Hz
V AC with Selectable Low-Pass Filter, V AC + FiL and dB V AC ........ 30
7.1.3 Frequency and Duty Cycle Measurement ........................................ 33
7.2 Resistance Measurement ........................................................... 34
7.3 Continuity Test with Constant Current of 1 mA ............................... 35
7.4 Diode Testing with Constant Current of 1 mA ................................. 36
7.5 Temperature Measurement ............................................................ 37
7.5.1 Measurement with Thermocouples, Temp TC .................................. 37
7.5.2 Measurement with Resistance Sensors ........................................... 38
7.6 Capacitance Measurement ............................................................ 39
7.7 Current Measurement .................................................................... 40
7.7.1 Direct and Pulsating Current Measurement, Direct Connection, A DC
and A (DC+AC) .............................................................................. 41
7.7.2 Alternating Current and Frequency Measurement,
Direct Connection, A AC and Hz ...................................................... 42
7.7.3 Direct and Pulsating Current Measurement with Current Clamp Sensor,
A DC and A (DC+AC) ..................................................................... 43
7.7.4 Alternating Current Measurement with Current Clamp Sensor,
A AC and Hz .................................................................................. 44
7.7.5 Alternating Current Measurement with Current Clamp Transformer,
A AC and Hz .................................................................................. 45

6Gossen Metrawatt GmbH
Table of Contents
Content Page Content Page
8 Device and Measuring Parameters .................................. 46
8.1 Paths to the Various Parameters ....................................................47
8.2 List of All Parameters ....................................................................47
8.3 Querying Parameters – InFo Menu ..................................................48
8.4 Entering Parameters – SETUP Menu ................................................49
8.5 StorE Menu – Parameter for Memory Mode Operation ......................51
8.6 Default Settings ..............................................................................53
9 Interface Operation ........................................................... 54
9.1 Arten von Schnittstellen und Anwendungszwecke .............................54
9.2 Activating the Interface ...................................................................54
9.3 Configuring Interface Parameters ....................................................55
10 Technical Data .................................................................. 57
11 Maintenance and Calibration ........................................... 64
11.1 Displays – Error Messages .............................................................64
11.2 Batteries ........................................................................................64
11.3 Fuse ..............................................................................................65
11.4 Cleaning ........................................................................................66
11.5 Recalibration ..................................................................................66
12 Repair ............................................................................... 67
13 Disposal and Environmental Protection ........................... 68
14 Accessories ...................................................................... 70
14.1 General .........................................................................................70
14.2 Technical Data for Measurement Cables
(scope of delivery: KS17-2 safety cable set) .....................................70
14.3 NA X-TRA Power Pack (not included) ...............................................70
14.4 Interface Accessories (not included) ................................................71
15 CE Declaration .................................................................. 73

Gossen Metrawatt GmbH 7
Safety
1 Safety Instructions
• Read and follow these instructions carefully and completely in
order to ensure safe and proper use.
• The instructions must be made available to all persons who
use the instrument.
• Keep for future reference.
General
• Tests/measurements may only be executed by a qualified elec-
trician.
• Observe and comply with all safety regulations which are appli-
cable for your work environment.
• Wear suitable and appropriate personal protective equipment
(PPE) whenever working with the instrument.
Accessories
• We recommend only using the specified accessories (included
in the scope of delivery or listed as options) with the instru-
ment.
If you use other accessories, Gossen Metrawatt assumes no li-
ability for property damage, personal injury or consequential
damage. Furthermore, no support will be provided.
• Carefully and completely read and adhere to the product docu-
mentation for optional accessories. Retain these documents
for future reference.
Handling
• Use the instrument in undamaged condition only.
Inspect the instrument before use. Pay particular attention to
damage, interrupted insulation or kinked cables.
•
Use the accessories and all cables in undamaged condition only.
Inspect accessories and all cables before use. Pay particular
attention to damage, interrupted insulation or kinked cables.
• If the instrument or its 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 in-
advertent use.
• If there are any signs of interior damage to the instrument or
accessories (e.g. Loose parts in the housing), permanently re-
move the instrument/accessories from operation and secure
them against inadvertent use.
• The tester and the accessories may only be used for the tests/
measurements described in the documentation for the tester.
• Observe and abide by visual and acoustic warning signals!
• The multimeter may only be operated by persons who are ca-
pable of recognizing touch hazards and taking the appropriate
safety precautions.
Touch hazards in accordance with the standard exist any-
where, where voltages of greater than 33 V (RMS) or 70 V DC
may occur. Avoid working alone when taking measurements
which involve touch hazards. Be certain that a second person
is present.
• The instrument is equipped with an automatic socket blocking
mechanism. 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

8Gossen Metrawatt GmbH
Safety
the rotary switch to impermissible functions after the measure-
ment cables have already been plugged in.
Do not bypass the automatic socket blocking mechanism.
• Maximum permissible voltage between the voltage measuring
sockets or all connector sockets and ground is 600 V for mea-
suring category III and 300 V for measuring category IV.
• Be prepared for the occurrence of unexpected voltages at de-
vices under test (e.g. defective devices). For example, capaci-
tors may be dangerously charged.
• Hazardous touch voltages are not detected when the ohm or
capacitance measurement is selected.
• If the instrument switches itself off in the event that hazardous
touch voltage is applied (only possible during memory mode
operation), the high-voltage warning symbol remains visible at
the display.
• Do not perform any measurements in electrical circuits with
corona discharge (high voltage).
• Dangerous pulsating voltages in HF electrical circuits! Use cau-
tion when performing measurements there.
• Dangerous voltage peaks with significant frequency compo-
nents of greater than 1 kHz are not displayed when the low-
pass filter is activated.
Measure voltage without the low-pass filter first, in order to be
able to detect any dangerous voltages.
• If dangerous voltages are applied in the high-impedance volt-
age measuring functions (switch position V), switching to low-
impedance measuring functions (switch position , continuity,
temperature or capacitance) causes “HiVoLt” to appear at the
display and the respective measurement is disabled.
Operating Conditions
• 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.
• Do not expose the instrument to direct sunlight.
• 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.).
In particular, do not overload the measuring ranges beyond
their allowable capacities.
• Do not use the instrument in potentially explosive atmo-
spheres. Danger of explosion!
Measurement Cables and Establishing Contact
• Plugging in the measurement cables must not necessitate any
undue force.
• Never touch conductive ends (for example 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.
• Avoid short circuits due to incorrectly connected measurement
cables.
• The measuring instrument, including measurement cables and
plug-on test probes, may only be utilized up to the maximum
specified measuring category.
If the measuring categories specified for the measuring instru-
ment and the measurement cables differ from each other, the
lower category applies.

Gossen Metrawatt GmbH 9
Safety
• Ensure that alligator clips, test probes, etc. make good con-
tact.
• Do not move or remove test probes, alligator clips, etc. until
testing/measurement has been completed.
Rechargeable or regular batteries
• The multimeter may only be operated with installed batteries or
rechargeable batteries. Dangerous currents and voltages are
otherwise not indicated, and the instrument may be damaged.
• Use batteries in undamaged condition only. Risk of explosion
and fire in the case of damaged batteries!
Inspect the batteries before use. Pay particular attention to
leaky and damaged batteries.
• Use the instrument only with the battery compartment lid in-
serted and properly closed.
Touch contact with dangerous voltage is otherwise possible.
Fuses
• The instrument may only be used as long as the fuses are in
flawless condition. Defective fuses must be replaced. Fuses
may only be replaced by our repair service department.
• Never bridge the fuses. Never put the fuses out of operation.
• Use the instrument only with the fuse compartment cover in-
serted and properly closed.
Touch contact with dangerous voltage is otherwise possible.

10 Gossen Metrawatt GmbH
Application
2 Application
Please read this important information!
2.1 Intended Use / Use for Intended Purpose
The instruments METRAHIT PM PRIME1) and METRAHIT PM
PRIME BT2) are high resolution TRMS digital multimeters for pro-
fessional use. All three are portable instruments which can be
held in the hand while performing measurements. They can be
used to perform the measurements described in these operating
instructions.
Performance characteristics of the individual models: See „Scope
of Delivery“ 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 al-
lows access to those jacks which are actually required for the se-
lected 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 user, as well as that of the instrument, is only as-
sured 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 im-
proper or incorrect use of the product, in particular due to failure
to observe the product documentation. The same applies to
maintenance measures which are not executed properly or in due
time. Furthermore, all guarantee claims are rendered null and void
in such cases.
Nor does Gossen Metrawatt GmbH assume any liability for data
loss.
1) Formerly METRAHIT ULTRA.
2) Formerly METRAHIT ULTRA BT.

Gossen Metrawatt GmbH 11
Documentation
3 Documentation
The following symbols with the meanings listed below are used in
this documentation.
3.1 Meanings of Danger Symbols
Warning concerning a point of danger
(attention, observe documentation!)
Symbol on the LCD:
Warning concerning dangerous voltage at the measurement
input:
U > 45 V
Hinweis
The auto power off function (APoFF parameter) is deactivated
when dangerous touch voltage is applied.
3.2 Meanings of Acoustic Warning Signals
High-voltage warning: > 600 V (intermittent acoustic signal)
Heavy current warning: > 10 A (intermittent acoustic signal)
Heavy current warning: > 16 A (continuous acoustic signal)
!

12 Gossen Metrawatt GmbH
Operating Overview – Connections, Keys, Rotary Switch, Symbols
4 Operating Overview – Connections, Keys, Rotary Switch, Symbols
1 Display (LCD) (see page 14 for significance of symbols)
2MAN / AUTO shift key for manual/automatic range selection
Increase parameter values
Operating mode menu:
select menu entries against flow direction
3 ON / OFF | LIGHT , on/off key for switching device and display light
4FUNC | ENTER multifunction key
Operating mode menu: acknowledge entry (ENTER)
5
Increase measuring range or move decimal point to right (MAN function)
6Rotary switch for measuring functions, (see page 15 for significance of sym-
bols)
7 DAkkS calibration seal
8 Connector socket for ground / connected to ground
9 Connector socket for current measurement with auto-blocking
10 Connector socket for voltage, resistance, temperature, diode and capaci-
tance measurement with automatic blocking
11 DATA/MIN/MAX
Key for freezing, comparing and deleting the measured value, and for the
Min-Max function
Decrease values
Operating mode menu: select of menu entries in flow direction
12 MEASURE | SETUP
Key for switching between measuring and menu functions
13 ZERO | ESC
Key for zero balancing
Operating mode menu: Exit current menu level and return to a
higher level, exit parameters
configuration without saving data
14 
Decrease measuring range or move decimal to left (MAN function)
15 Power pack connector jack
16 Infrared interface
1
3
4
16
5
6
9
*
section 6.3
section 5
section 7
section 9
section 8
section 5 ff.
section 5
13
12
section 6.1
10
2section 6.1
14
8
Max. 600 V!
11
15
section 6.1 
section 6.4 
section 8 
section 5 
section 8 
section 5.1 
7
section 3.1

Gossen Metrawatt GmbH 13
Operating Overview – Connections, Keys, Rotary Switch, Symbols
Symbols Used in the Digital Display 1 Battery level indicator
2 ON: continuous operation (automatic shutdown deactivated)
3 DATA: display memory, “freeze measured value”
4 STORE: memory mode active
5 FILTER: low-pass filter active
6IR: infrared interface indicator
7 Bluetooth interface control display
8Auxiliary display: digital display with decimal point and polarity display
9 Transformation ratio (factor for current sensor and transformer clamps)
10 dB: alternating voltage level measurement
11 Selected type of current
12 TRMS measurement
13 Unit of Measure
14 Warning regarding dangerous voltage: U > 45 V AC/DC
15 Main display : digital display with decimal point and polarity display
16 Continuity test with acoustic signal active
17 Pt100/Pt1000: selected platinum resistance sensor with automatic recog-
nition of Pt100/Pt1000
18 TC: temperature measurement with type K thermocouple (NiCr-Ni)
19 h (hours): unit of time
20 MAN: manual measuring range selection active
21 ZERO: zero balancing active
22 REL: relative measurement with reference to offset
23 min: minimum value storage
24 Diode measurement selected
25 max: maximum value storage
26 Stopwatch active or time since beginning of measurement
27 ON: no function here
28 sec (seconds): unit of time
29 Upm : no function here
Battery full
Battery OK
Battery weak
Battery (almost) dead, U < 2.0 V
Data transmissionto / from multimeter active
IR interface in standby mode
(ready to receive starting commands)
Battery Level Indicator
Interface Indicator
126
8
13
14
16
4 5
7
3
10
12
9
18
23 262019
17
15
24
11
21 22 25 2728 29
7

14 Gossen Metrawatt GmbH
Operating Overview – Connections, Keys, Rotary Switch, Symbols
Symbols Used for Rotary Switch Positions
Switch FUNC Main Display Auxiliary Display Measuring Function
V~ 0/4 V~ AC TRMS Hz Alternating voltage, AC TRMS, full bandwidth / voltage frequency
Hz (V) 1 Hz V~ AC Voltage frequency, up to 300 kHz / alternating voltage, AC TRMS
V~ 2 V FILTER ~ AC TRMS Hz Alternating voltage, AC TRMS, with low pass filter (1 kHz) / voltage frequency
dB 3 dB V~ AC TRMS Alternating voltage level measurement
V0/4 V DC+AC TRMS Hz Pulsating voltage, TRMS ( ) / voltage frequency
V1 Hz V DC+AC TRMS Voltage frequency / pulsating voltage, TRMS
V2 V FILTER DC+AC TRMS Hz Pulsating voltage, TRMS with low pass filter (1 kHz) / voltage frequency
dB 3 dB V DC+AC TRMS Alternating voltage level measurement
V 0/2 V DC — Direct voltage
MHz 0/2 MHz —(High) frequency at 5 V~ up to 1 MHz
%1 % Hz Duty cycle / frequency
——(DC)resistance
0/2 — Continuity test () with acoustic signal
1V DC — Diode voltage up to max. 4.5 V
Temp . TC 0/2 C, type K C internal temp. at jacks Temperature, type K thermocouple
Temp . RT D 1°Pt100 Temperature with Pt100 / Pt1000 resistance sensor
— nF — Capacitance
A0/3 A DC — Direct current value
A1 A DC+AC TRMS Hz Pulsating current amperage, TRMS AC+DC / current frequency
A2 Hz A DC+AC TRMS Frequency / pulsating current amperage, TRMS AC DC
A~ 0/2 A~ AC TRMS Hz Alternating current amperage, TRMS AC / current frequency
Hz (A) 1 Hz ~ AC Hz ~ AC Current frequency / alternating current amperage, TRMS AC
0/3 A DC — DC amperage with AC DC Current clamp sensor, 1 V:1/10/100/1000 A
1
A DC+AC TRMS Hz Pulsating current amperage, TRMS / current frequency with AC DC current clamp sensor, see above
2
Hz A DC+AC TRMS Current frequency / pulsating current amperage, TRMS, with AC DC current clamp sensor, see above
0/2 A~ AC TRMS Hz Alternating current amperage, TRMS, with Current clamp sensor, see above
Hz ( ) 1 Hz ~ AC ~ AC Current frequency
1kHz
VAC DC+VAC
2VDC
+=
A
A
A
A
A

Gossen Metrawatt GmbH 15
Operating Overview – Connections, Keys, Rotary Switch, Symbols
User Interface Symbols in the Following Sections
... Scroll through main menu
... Scroll through submenu
Select decimal point
 Increase/decrease value
time Submenu/parameter (7-segment font)
1nFo Main menu (7-segment font, boldface)
Symbols on the Device
Warning concerning a point of danger
(attention, observe documentation!)
Ground
CAT III / IV Measuring category III or IV device
(Significance per IEC 61010-1:
III: Measurements in building installations: stationary
consumers, distributor terminals, devices connected
permanently to the distributor
IV: Measurements at power sources for low-voltage
installations: Meters, mains terminals, primary over-
voltage protection devices
Continuous, doubled or reinforced insulation
Indicates European Conformity
▲IR ▼Position of the infrared interface, window on the top of
the instrument
Position of the power pack adapter socket,
see also section 5.1
Fuse for current measuring ranges, see section 11.3
This device 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).
Calibration Seal (blue seal):
See also “Recalibration” on page 66.
!
5V/600mA
Consecutive number
Registration number
Date of calibration (year – month)
Deutsche Akkreditierungsstelle GmbH – calibration lab
XY123
2019-04
D-K
15080-01-01

16 Gossen Metrawatt GmbH
Initial Start-Up – Setup
5 Initial Start-Up
5.1 Establishing Electrical Power Supply
You can operate the instrument either with batteries, rechargeable
batteries or with the optional power pack.
Operation with Batteries or Rechargeable Batteries
Please refer to section 11.2 for instructions on how to insert (and
subsequently replace) batteries.
Attention!
!
Observe and comply with the instructions and the safety in-
formation given in section 11.2.
Momentary battery voltage can be queried in the Info menu (see
section 8.3.
Operation with power pack (accessory, not included, see section 14.3)
Installed batteries are disconnected electronically if the NA X-TRA
power pack is used, and therefore need not be removed from the
instrument.
If the external power supply is switched off, the device is switched
to battery / rechargeable battery operation without interruption.
5.2 Switching the Instrument On
Switching the Instrument On Manually
➭Press the ON / OFF | LIGHT key until the display appears.
Power-up is acknowledged with a brief acoustic signal. As
long as the key is held depressed, all of the segments at the
liquid crystal display (LCD) are illuminated.
The LCD is depicted on page 13.
The instrument is ready for use as soon as the key is released.
Display Illumination
After the instrument has been switched on, background illumina-
tion can be activated by briefly pressing the ON / OFF | LIGHT key. Il-
lumination is switched back off by once again pressing the same
key, or automatically after approximately 1 minute.
Switching the Instrument On with a PC
The multimeter is switched on after transmission of a data block
from the PC, assuming that the “irStb” parameter has been set to
“iron” (see section 8.4).
However, we recommend using the power saving mode: “iroff”.
Note
Electrical discharge and high frequency interference may
cause incorrect displays to appear, and may disable the
measuring sequence.
Disconnect the device from the measuring circuit. Switch the
instrument off and back on again in order to reset. If the
problem persists, briefly dislodge the battery from the con-
nector contacts (see also section 11.2).

Gossen Metrawatt GmbH 17
Initial Start-Up – Setup
5.3 Setting the Operating Parameters
Setting Time and Date
See the “tiME” and “dAtE” parameter in section 8.4.
5.4 Switching the Instrument Off
Switching the Instrument Off Manually
➭Press the ON / OFF | LIGHT key until 0FF appears at the display.
Shutdown is acknowledged with a brief acoustic signal.
If hazardous contact voltage has been detected (HV symbol appears), the instru-
ment cannot be switched off.
Automatic Shutdown
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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 (see “APoFF” parameter on page 49). Shut-
down is acknowledged with a brief acoustic signal.
Automatic shutdown is disabled in the following operating modes: continuous
operation and whenever dangerous contact voltage has been detected (excep-
tion: memory mode).
Disabling Automatic Shutdown
The instrument can be set to continuous operation.
➭While switching the instrument on, simultaneously press the
and keys to this end.
The “Continuous On” function is indicated at by means of the
ON display to the right of the battery symbol.
The “Continuous On” setting can only be canceled by changing the
respective parameter (see “APoFF” page 49) or by switching the
instrument off manually.
In this case, the parameter is reset to 10 minutes.
ON / OFF
LIGHT
FUNC
ENTER

18 Gossen Metrawatt GmbH
Initial Start-Up – Setup
ON / OFF
LIGHT
Auto-Range
8.8.8.8.8
Illumination ON
000.00
ON / OFF
LIGHT
Illumination OFF
000.00
ON / OFF
LIGHT
0ff
ON / OFF
LIGHT
long
(1 s)

Gossen Metrawatt GmbH 19
Control Functions
6 Control Functions
6.1 Selecting Measuring Functions and Measuring Ranges
The rotary switch is linked to the automatic socket blocking
mechanism, which only allows access to two connector jacks for
each function. Be certain to remove the appropriate plug from its
respective jack before switching to and from the “A” functions.
The socket blocking mechanism prevents the user from inadver-
tently turning the selector switch to impermissible functions after
the measurement cables have been plugged into the instrument.
Presence of Dangerous Touch Voltages
If dangerous volt-
ages are applied in
the high-imped-
ance voltage mea-
suring functions
(switch position V
or PQ), switching
to low-impedance
measuring func-
tions (switch posi-
tion MHz, , conti-
nuity, temperature
or capacitance)
causes “HiVoLt” to
appear at the dis-
play and the re-
spective measure-
ment is disabled. The measuring function is not switched until
dangerous touch voltage is no longer applied to the input. If the
instrument switches itself off in the event that hazardous touch
voltage is applied (during memory mode operation with large
sampling period), the high-voltage warning symbol remains visible
at the display.
6.1.1 Automatic Range Selection
The multimeter is equipped with auto-ranging for all measuring
functions, except for temperature measurement and diode and
continuity testing. Auto-ranging is active as soon as the instru-
ment is switched on. The instrument automatically selects the
measuring range which allows for highest possible resolution of
the applied quantity.
AUTO-Range Function
The instrument is switched automatically to the next higher range
at (310,000 d + 1 d) 031,000 digits, and to the next lower
range at (28,000 d – 1 d) 27,999 digits.
The instrument automatically switches to the next higher or next
lower measuring range for the following measured quantities:
230 . 00
V
050 . 00
AC
TRMS
Hz
U > 45 V:
V~
V
VTem p
TC
Temp
RTD
hivolt
Measuring Range Reso-
lution
Switching to Next
Higher Range
at (... d + 1 d)
Switching to Next
Lower Range
at (... d -1 d)
V,A,, Hz 5¾ 310,000 28,000
V , V , A , A 4¾ 31,000 2800
3 nF ... 3 mF 3¾ 3100 280

20 Gossen Metrawatt GmbH
Control Functions
6.1.2 Manual Measuring 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
activated or the instrument is switched off and back on again.
Overview: Auto-Ranging and Manual Range Selection
* Via manual measuring range selection only
6.1.3 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. selection of the measuring
range with the best resolution (see section 6.1.2)
or
•WiththeDATA function (see section 6.4). 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.
6.2 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 for
auto-ranging, as well as for manual measuring range selection.
Function Display
MAN / AUTO
Manual mode active:
utilized measuring range is fixed MAN
or 
Range switching sequence for:
V : 300 mV*  3V  30 V  300 V  600 V
Hz (V AC) :300 Hz  3 kHz  30 kHz  300 kHz
MHz: 300 Hz  3 kHz  30 kHz  300 kHz  1 MHz
 : 300  3 k  30 k  300 k  3 M  30 M 
A : 300  A  3 mA  30 mA  300 mA  3A  10 A (16 A)
Hz (A AC): 300 Hz  3 kHz  30 kHz
F : 3 nF  30 nF  300 nF  3  F  30  F  300  F 
 3  mF
MAN
MAN / AUTO Return to automatic measuring range selection —
Deviation from zero
– With short-circuited measurement cables for V, , A
– With open input for capacitance unit of measure (F)
Display
0 to 200 digits ZERO REL
> 200 D to (150,000 digits) 50% of the measuring range REL