Gossen MetraWatt METRISO INTRO User manual

METRISO INTRO, BASE, TECH
Insulation, Low Resistance and Voltage Measurement Instrument 3-349-812-03
4/8.19
Operating Instructions
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Features Overview of Both Instrument Variants Scope of delivery:
1 Insulation and resistance measuring instrument
1 DAkkS calibration certificate (not METRISO INTRO)
1 Set batteries (8 ea. in battery holder) (not METRISO INTRO)
1Carryingstrap
1 Alligator clip (not METRISO INTRO)
1 KS17-4 cable set
1 Condensed operating instructions
1 Supplement Safety Information
1 Detailed operating instructions for download from our website
Battery Compartment Lid and Location of the Fuses
(housing bottom)
METRISO INTRO BASE TECH
Article number M550N M550O M550P
Measurements
RINS U = 1000 V ✓—✓
RINS U = 250, 500 V ✓✓✓
RINS U = 50, 100 V —✓✓
R 10 Ω ... 10 kΩ—✓✓
RLO 0.17 Ω ... 10 Ω✓✓✓
U 0 ... 1000 V ✓—✓
U 0 ... 500 V ✓✓✓
Display Functions
Backlit display ✓✓✓
Limit value LED (green/red) for:
Additional acoustic signal, limit value per VDE 0100 RINS RLO RINS RLO RINS RLO
LED for dangerous contact voltage
(when switched off) —✓✓
LCD symbol for external voltage ✓✓✓
Battery level display ✓✓✓
Special Functions
Discharge capacitive devices under test ✓✓✓
Safety shutdown (UBatt < 8 V) ✓✓✓
Features
CAT II 1000 V / CAT III 600 V / CAT IV 300 V ✓—✓
Measuring category CAT II I 600 V / CAT IV 300 V ✓✓✓
10 MΩtest resistor —✓✓
DAkkS calibration certificate —✓✓
a b
Replacement Fuse
Fuse
Battery Compartment Lid
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GMC-I Messtechnik GmbH 3
Inserting the Battery Holder (side view) Connections (housing top)
1Z550A accessory as option: Test probe with a key for triggering measurement, and
an additional key for illuminating the measuring point, including shielded plug-in
connector cable
Battery Holder
Battery Compartment Lid
Battery Holder
Contacts
Battery
Contact
Spring
User Interface
Compartment
+COM
+COM SHIELD
Shielded
Cable
Test
Resistor*
Test
Resistor*
Measuring
Test Probe with
Control Keys 1
10 MΩ*
Connector with
Shielded Cable,
Option KS-C (Z541F)
(G500/G100G500/G1000)
Connections
GUARD*
* not METRISO INTRO
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User Interface (Example METRISO TECH)
LCD panel
Start measurement
Parameters transfer
Exit
Activate instrument
Continuous
Scroll down:
Red LED: limit value exceeded
Red LED:
– External voltage with device switched off *
Setup menu SEt
Function
selector switch
Guide for
carrying strap
Guide for
carrying strap
M Vk
TRMS
AC
DC
Rlo>10%
MAN
DATA
STORE
ZERO GISO 2500V
1000 V
Tk
100
k
1
G
10
k
1
M
10
G
0
1000V
1200
G
100
M
10
M
Green LED: limit value adhered to
– SETUP: parameter selection
– V: voltage type selection
– Rlo: polarity reversal
Scroll up:
– SETUP: parameter selection
– V: voltage type selection
– Rlo: polarity reversal
– Test/Measuring voltage with device switched on
for Riso/Rins,
menu
from standby
state
measurement
R & RLO
– Discharge voltage for Riso/Rins
* not
METRISO INTRO
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Digital Display Symbols
1 Battery level indicator
2 Digital display with decimal point and polarity display
3MAN: Low-resistance measurement:
manual measuring range selection active
4Rlo: Low-resistance measurement:
special case for automatic low-resistance measure
ment with measurement in both directions of current
flow: both measured values are displayed where Δ Rlo > 10%
5Low-resistance measurement:
polarity reversal display (reversed current flow
direction) Ω→ or ←Ω
6 Analog display pointer: bar graph or pointer,
see A.diSP parameter on page 12
Triangle at display: indicates overranging
7DC/AC: Selected current type
8
ISO xxxV: Insulation resistance measurement: selected test voltage
9ΩV: Unit of measure
10 ZERO:
Cable compensation for low-resistance measurement is
active,
see rLEAd parameter on page 11
11 DATA: Blinks during measurement
Static: measured value is stable
12 Warning regarding dangerous voltage:
U > 50 V AC/DC
13 Acoustic signal (beeper) active for exceeded limit
values, see bEEP parameter on page 12
14 ON Instrument is continuously on
(except with switch in OFF position),
see APOFF parameter on page 12
MVk
TRMS
AC
DC
Rlo>10%
MAN
DATA
ZERO GISO 2500V
1000 V
T
k
100
k
1
G
10
k
1
M
10
G
0
1000V
1200
G
100M
10
M
6
7
8
1 3
10 9
13
12
4 52
11
On
14
Battery full
Battery OK
Battery weak
Battery (almost) dead, U < 8.5 V
Battery level indicator
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Contents Page Contents Page
1 Applications ...............................................................................7
2 Safety Features and Precautions ..............................................8
3 Initial Start-Up ...........................................................................9
3.1 Battery test ......................................................................................9
3.2 Installing or Replacing Batteries .....................................................9
3.3 Query and Set Device Parameters – SETUP Function ...................10
3.3.1 Paths to the Various Parameters ...............................................................10
3.3.2 Querying Parameters – InFo Menu (as moving letters) ..............................11
3.3.3 Entering Parameters – SEt Menu ...............................................................11
3.3.4 Default Settings .........................................................................................13
4 General Operation ....................................................................14
4.1 Switching On, Monitoring and Switching Off ................................14
4.2 Measured Value Display ................................................................15
5 Measuring Insulation Resistance – Riso/Rins Function ......................16
5.1 Connection ....................................................................................16
5.2 Performing the Measurement .......................................................16
5.3 Ending the Measurement ..............................................................17
6 Measuring Direct, Alternating and
Pulsating Voltage – V Function ................................................18
7 Measuring Resistance – k Ω / Ω Function (METRISO BASE/TECH) .......19
8 Measuring Low-Value Resistance (up to 10 Ohm) – R
LO
Function ......20
8.1 Measurement with Automatic Polarity Reversal – AUTO Function ........... 21
8.2 Measurement with Manual Polarity Reversal – MAN Function .....22
8.3 Taking Measurement Cables and Extension Cables into Account (up
to 10 Ohm) – ZERO Function (Roffset) ...........................................23
9 Test Resistor for Insulation Measurement for Checking the
Insulation Measuring Instrument ............................................ 23
10 Characteristic Values .............................................................. 24
11
List of Abbreviations and their Meanings ..................................... 28
12 Maintenance ........................................................................... 28
12.1 Battery and Rechargeable Battery Operation ................................28
12.2 Fuses .............................................................................................29
12.2.1Fuse Link – FUSE Message ........................................................................ 29
12.2.2Electronic Fuse .......................................................................................... 30
12.3 Housing .........................................................................................30
13 Recalibration ........................................................................... 30
14 Appendix ................................................................................. 31
14.1 Sample Connection Layouts for Insulation Resistance Measurement ......31
14.2 Attaching the strap to the test instrument ....................................34
14.3 Attaching the Test Probe Holder to the Carrying Strap ................34
14.4 Technical Data for Measurement Cables
(scope of delivery: KS17-4 safety cable set) .................................35
14.5 Optional Accessories (not included) ..............................................36
14.5.1 Application Test Probe for Remote Triggering (Option Z550A) ................................ 36
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1 Applications
These instruments fulfills all requirements of applicable European
and national EC directives. We confirm this with the CE mark. The
relevant declaration of conformity can be obtained from GMC-I
Messtechnik GmbH.
METRISO INTRO/BASE/TECH insulation and resistance measur-
ing instruments allow for quick and efficient testing of protective
measures in accordance with DIN VDE 0100, ÖVE-EN 1 (Austria),
NIV/NIN SEV 1000 (Switzerland), and regulations specific to addi-
tional countries.
The device is equipped with a microprocessor and complies with
IEC/EN 61557 / VDE 0413 regulations:
Part 1: General requirements
Part 2: Insulation resistance measuring instruments
Part 4: Instruments for the measurement of resistance at
earthing conductors, protective conductors and bond-
ing conductors
Part 10: Combined measuring equipment for testing, measuring
or monitoring protective measures
As well as requirements per VDE 0701-0702:
Repair, modification and inspection of electrical appliances.
The test instrument is especially well suited for:
•Systemsset-up
• Initial start-up
• Periodic testing
• Troubleshooting in electrical systems
The following measurements and tests can be performed with the
insulation measuring instruments:
• Insulation resistance
• Low-resistance
• Voltage
The following can also be tested by using a shielded measure-
ment cable:
• Floor covering electrostatic discharge capability
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2 Safety Features and Precautions
The electronic measuring and test instrument is manufactured
and tested in accordance with safety regulations IEC/EN 61010-1
/ VDE 0411-1 and EN 61557.
When used for its intended purpose,
safety of the operator, as well as that of the instrument, is assured.
Read the operating instructions thoroughly and carefully before using
your instrument. Follow all instructions contained therein. Make sure that
the operating instructions are available to all users of the instrument.
Tests may only be executed by a qualified electrician.
The measuring and test instrument may not be placed into service:
• If the battery compartment lid has been removed
• If external damage is apparent
• If connector cable or measuring adapters are damaged
• If the instrument no longer functions flawlessly
• After extraordinary damage due to transport
• After long periods of storage under unfavorable conditions
(e.g. humidity, dust or extreme temperature)
Opening of Equipment / Repair
The equipment may be opened only by authorized service per-
sonnel to ensure the safe and correct operation of the equipment
and to keep the warranty valid.
Even original spare parts may be installed only by authorized ser-
vice personnel.
In case the equipment was opened by unauthorized personnel,
no warranty regarding personal safety, measurement accuracy,
conformity with applicable safety measures or any consequential
damage is granted by the manufacturer.
Meaning of Symbols on the Instrument
Warning concerning a source of danger
(attention: observe documentation!)
Protection class II device
CAT II/ III Device assigned to measuring categories
METRISO INTRO/TECH:
CAT II 1000 V / CAT III 600 V / CAT IV 300 V
METRISO BASE:
CAT III 600 V / CAT IV 300 V
Indicates European Conformity
The device and included batteries may not be dis-
posed of with the trash. Further information regarding
the WEEE mark can be accessed on the Internet at
www.gossenmetrawatt.com by entering the search
term “WEEE”.
Calibration Seal (blue seal):
See also “Recalibration” on page 30.
!
XY123
2019-08
D-K
15080-01-01
Consecutive number
Registration number
Date of calibration (year – month)
Deutsche Akkreditierungsstelle GmbH – calibration lab
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GMC-I Messtechnik GmbH 9
3 Initial Start-Up
3.1 Battery test
Four different battery symbols, ranging from fully depleted to fully
charged, continuously indicate the momentary charge level in the
upper left-hand corner of the display
If battery voltage has fallen below the allowable lower
limit, the pictograph shown at the right appears. The
instrument does not function if the batteries have been depleted
excessively, and no display appears.
3.2 Installing or Replacing Batteries
New batteries must be inserted for initial start-up, or if only one
filled segment remains in the battery symbol.
Attention!
!
Before opening the battery compartment (see page 5 for
location), disconnect the instrument from the measuring
circuit (mains) at all poles.
Eight 1.5 V size AA batteries in accordance with IEC LR 6 are
required for operation of the insulation measuring instrument. Use
new alkaline manganese batteries only.
Rechargeable NiCd or NiMH batteries may also be used. These
can only be recharged externally. We recommend rechargeable
NiMH batteries.
Always replace batteries in complete sets.
Dispose of batteries in an environmentally sound fashion.
ÐLoosen both slotted screws for the battery compartment lid
on the back, and remove the lid.
ÐRemove the battery holder and insert eight 1.5 V size AA bat-
teries with correct polarity in accordance with the symbols.
Attention!
!
Make sure that all of the batteries are inserted with correct
polarity. If just one battery is inserted with reversed polar-
ity, it will not be recognized by the instrument and may
result in leakage from the batteries.
ÐPush the battery holder into the battery compartment such
that the battery holder’s contacts touch the contact springs at
the bottom of the battery compartment (see drawing on
page 3).
If the battery holder is not inserted as specified, the instrument
cannot be supplied with power.
ÐReplace the battery compartment lid and retighten the
screws.
Attention!
!
The instrument may only be placed into service if the
battery compartment lid is securely fastened!
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3.3 Query and Set Device Parameters
– SETUP Function
ÐTurn the rotary switch to the SETUP position.
info appears at the display.
ÐPress ENTER to query battery voltage or firmware version.
ÐThen select the desired operating parameters with the scroll
keys and acknowledge by pressing the ENTER key.
The desired information is displayed in the scroll mode (moving
letters).
3.3.1 Paths to the Various Parameters
info
SETUP
bAtt:
uers
ion
1nFo SET
Query Parameter ↓
rlead
APoFF
blight
bEEP
A.d
iSP
0..d
iSP
START
ENTER
Acknowledge
START
ENTER
Set Parameter ↓
←Main Menus →
ESC
stby OFF
START
ENTER
ESC
stby OFF
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List of all parameters (alphabetical order)
3.3.2 Querying Parameters – InFo Menu (as moving letters)
bAtt –Query Battery Voltage
1nFo bAtt:12.05 V.
vErSion – Query Firmware Version
1nFo bAtt:uErS ion:1.0.0
3.3.3 Entering Parameters – SEt Menu
rLEAd – Offset Resistance for Low-Resistance Measurement
Measurement cable ohmic resistance can be subtracted from the
measurement results automatically. Offset must be determined
and saved to memory via the rLEAd parameter to this end.
ÐConnect the measurement cables to the +and COM jacks.
ÐShort circuit the two test probes connected to the measure-
ment cables (including extension cables).
ÐSelect the rLEAd parameter and acknowledge by pressing the
ENTER key. Select ZERO and acknowledge by pressing the
START key in order to trigger measurement of offset resistance:
1nFo
SET rlead
zero / Clear 
Low-resistance measurement as described in section 8.1 is con-
ducted in both directions with automatic polarity reversal.
Note
If the test probes are not short circuited, the SHort LEAdS
prompt appears at the display.
The measurement results, i.e. the resistance of the two measure-
ment cables, are subtracted from future low-resistance measure-
ments as an offset value, and ZERO appears in the footer.
After selecting the CLEAr parameter and acknowledging by press-
ing the ENTER key, you’re provided with the opportunity of per-
forming future measurements without using the offset. If this is the
case, ZERO is no longer displayed. In this case, measurement
cable resistance is included in the measurement.
Parame-
ter
Page: Header
0 . d iSP 13: 0.diSP – Show/Hide Leading Zeros
A . d iSP 12: A.diSP – Analog Display: Select Display Mode
APoFF 12: APoFF – Specified Time for Automatic Shutdown and Continuous ON
bAtt 11: bAtt – Query Battery Voltage
bEEP 12: bEEP – Acoustic Indication of Exceeded Limit Values
blight
12: bLiGt – Switching LCD Illumination On/Off
Com For service purposes only
1nfo 11: Querying Parameters – InFo Menu (as moving letters)
liled 13: LiLEd – Optical Indication of Limit Value Violations
SET 11: Entering Parameters – SEt Menu
uErS
ion
11: vErSion – Query Firmware Version
rlead 11: rLEAd – Offset Resistance for Low-Resistance Measurement
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
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APoFF – Specified Time for Automatic Shutdown and Continuous ON
Shutdown time APoFF can be specified with this parameter. The
instrument is switched off automatically if the measured value
remains unchanged for a long period of time and if none of the
keys or the rotary switch have been activated before specified
APoFF time (entered in minutes) has elapsed.
The selected on-time has as substantial influence on battery ser-
vice life.
If the on setting is selected, the instrument is set for long-term
measurement and ON appears at the display to the right of the
battery symbol. In this case, the instrument can only be switched
off manually.
1nFo
SET rlead ... ... APoFF
10 ... 59 min on 
(10 minutes = default setting)
bLiGt – Switching LCD Illumination On/Off
Automatic deactivation of display illumination after xx seconds
(after the last time the rotary switch is actuated) can be selected in
order to extend the battery service life. As soon as a new measur-
ing function is selected or started, illumination is reactivated.
When set to oFF, illumination is permanently deactivated.
1nFo SET rlead ... ... bligt
15 / 30 / 45 / 90 s off 
(15 seconds = default setting)
bEEP – Acoustic Indication of Exceeded Limit Values
This parameter allows you to decide whether or not exceeded
limit values will be indicated acoustically.
on = acoustic indication activated
1nFo
SET rlead ... bEEP
on / off
(on = default setting)
A.diSP – Analog Display: Select Display Mode
One of two different display modes can be selected for the analog
display:
•bArG: bar graph
•Po int: pointer
1nFo
 SET rlead ... A.diSP
bArG / Po int 
(po int = default setting)
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
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GMC-I Messtechnik GmbH 13
0.diSP – Show/Hide Leading Zeros
This parameter determines whether or not leading zeros will
appear in the measured value display.
1nFo  SET rlead ... 0.diSP
0000.0: with leading zeros (default value)
0.0: leading zeros suppressed

LiLEd – Optical Indication of Limit Value Violations
This parameter allows you to decide whether or not limit value vio-
lations will be indicated optically.
on = optical indication activated
1nFo
SET rlead ... ... liled
on / off 
(on = default setting)
3.3.4 Default Settings
Previously entered changes can be undone, and default settings
can be restored. This may be advisable under the following cir-
cumstances:
• After the occurrence of software or hardware errors
• If you are under the impression that the instrument does not
work correctly
ÐDisconnect the device from the measuring circuit.
ÐBriefly remove the batteries (see also section 3.2).
ÐPress and hold the key,
and reinsert the batteries.
After hearing two acoustic signals, the instrument has been
restored to its default settings.
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
START
ENTER
ESC
stby OFF
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4 General Operation
The test leads are connected to the “+” and “COM” jacks.
Measuring High-Value Resistance with the KS-C Probe (Option)
When measuring electrostatic
discharge capacity for floor
coverings, the shielded cable
should also be connected to
the COM and SHIELD jacks (KS-C
accessory set, “cable set con-
sisting of measurement cable
and high-resistance measure-
ment cable for measurements
in the GΩrange”, see diagram). Be sure to observe color coding.
For measuring with the Test Probe for Remote Triggering (Option Z550A)
see section 14.5.1.
4.1 Switching On, Monitoring and Switching Off
After switching on the device, an acoustic message is generated
which signals that the test instrument is ready for operation.
If battery voltage falls below the allowable limit value (U < 8 V) the instru-
ment cannot be switched on, or it is immediately switched off.
Measurement cannot be started in the resistance measuring
ranges in the event of external voltage.
The instrument only switches itself off automatically after comple-
tion of an automatic measuring sequence, and after the predeter-
mined on-time has expired (APOFF parameter in SETUP switch
position, see page 12). On-time is reset to its original value as
defined in the setup menu, as soon as any key or the rotary func-
tion switch is activated.
If the instrument is switched off automatically with the rotary
switch in any position other than OFF, it can be reactivated by
pressing the stby OFF key.
The instrument can be switched off manually by turning the rotary
switch to the OFF position.
Optical Indicators
1Prerequisite: The LiLEd parameter is set to on (see page 13).
2Function testing should be executed regularly (see following section on testing
LEDs).
+
COM SHIELD
KS-C
(Z541F)
LED Status Function – Cause
Limit value indication 1
– Measured insulation resistance does not violate the limit
value.
– Measured low-resistance Rlo does not violate the limit
value.
Limit value indication 1
– Measured insulation resistance has fallen short of the se-
lected limit value.
– Measured low-resistance Rlo does has exceeded the per-
missible limit value.
External voltage when on or off (not M550N) and during discharge
2
Dangerous voltage of greater than 50 V is present at the mea-
surement inputs:
– Initialization of the (insulation) resistance and
low-resistance measurements is disabled.
– The discharging cycle has not yet been completed,
e.g. residual voltage at capacitive devices under test
Test/Measuring voltage with device switched on
Dangerous voltage of greater than 50 V is present at the mea-
surement inputs.
LCD Status Functions
Display
External voltage when off, and during discharge
Dangerous voltage of greater than 50 V is present at the
measurement inputs:
– Initialization of the insulation resistance and
low-resistance measurements is disabled.
– Test voltage applied during insulation measurement
– The discharging cycle has not yet been completed,
e.g. residual voltage at capacitive devices under test
Limit
Green
Limit
Red
!
Red
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GMC-I Messtechnik GmbH 15
Testing the LED which Indicates the Detection of External Voltage
when Switched Off – OFF Switch Position
ÐApply a voltage of greater than 50 V (+ and COM jacks).
ÐTurn the rotary switch to the V position.
ÐRead the voltage value at the LCD.
ÐTurn the rotary switch to the OFF position.
Test results: If applied voltage is unchanged and the LED which
indicates the detection of external voltage lights up red, the LED is
OK. In this case, the LED reliably indicates external voltage even
when the instrument is switched off. We recommend executing
this test at regular intervals.
Limit Values for Insulation and Low-Resistance Measurements
Acoustic Signals
Limits can also be indicated acoustically by setting the beeP
parameter to on (see page 12).
The loudspeaker symbol appears in this case.
– Low-Resistance Measurement: Signal when R
LO
< 2 Ω (Continuity test)
– Insulation Measurement : Signal when RINS < limit value
4.2 Measured Value Display
The following appear at the LCD panel:
• Measured value in digital format
• Measured value in analog format as bar graph or pointer
• Unit of measure
Measured values for automatic measuring sequences are
retained at the display as digital values until the next measure-
ment sequence is started, or until automatic shut-off occurs.
If the upper range limit is exceeded, 0L appears at the display,
thus indicating overranging.
If the lower range limit is fallen short of, ur appears at the display,
thus indicating underranging.
Either a bar graph or a pointer can be selected for the analog dis-
play (see AdiSP parameter on page 12).
METRISO INTRO BASE TECH
(M550N
) (M550O) (M550P)
Limit
RISO / RINS
50 kΩ@ UISO/UINS = 50 V — 33
100 kΩ@ UISO/UINS = 100 V — 33
500 kΩ@ UISO/UINS = 250 V 333
1 MΩ@ UISO/UINS = 500 V 333
1 MΩ@ UISO/UINS = 1000 V 3 — 3
Limit RLO 2 Ω 333
Limit
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16 GMC-I Messtechnik GmbH
5 Measuring Insulation Resistance – Riso/Rins Function
5.1 Connection
Note
Checking the Measurement Cables
Before performing insulation measurement, the test
probes on the measurement cables should be short-cir-
cuited in order to assure that the instrument displays a
value very close to 0 Ω(see section 8). This makes it pos-
sible to detect interrupted measurement cables, which
simulate high insulation resistance.
For this instrument, fuse testing is only performed after swit-
ching from one insulation resistance measuring range to
another. When further measurements are performed in the
same measuring range, fuse testing is dispensed with for the
sake of a faster test procedure.
ÐConnect the device under test to the +and COM jacks.
Sample connection layouts for insulation resistance measurement are
included in section 14.1. Insulation resistance can only be measured at
voltage-free objects. If mains voltage or external voltage is applied to the
measurement inputs, measurement cannot be started. This is indicated
by the
high-voltage symbol which appears at the display.
5.2 Performing the Measurement
Note: Condensation must be ruled out when performing measure-
ments at close to the freezing point.
ÐSelect the measuring function and the desired test voltage
with the rotary switch, e.g. RiSO 100V.
The momentarily selected test voltage (nominal voltage) appears
in the bottom right-hand corner of the display.
Ð
Start an individual measurement by briefly pressing the START key, or
initiate continuous measurement by briefly pressing the
CONTIN key .
L1
L2
N
PE
L3
RBRE
+COM
RISO
+COM SHIELD
Rx
0V !
!
RISO
RINS
MAN
DATA ISO 500V
100
k
1
G
10
k
1
M
10
G
1 00
G
100
M
10
M
---
START
ENTER
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GMC-I Messtechnik GmbH 17
DATA blinks at the display until the measured value has settled in.
Attention!
!
Do not touch the instrument’s terminal contacts during
insulation resistance measurements!
If nothing has been connected to the terminal contacts, or if a
resistive load component has been connected for measurement,
your body would be exposed to a current of approximately 1 mA
at a voltage of 1000 V. The resulting electrical shock is not life
endangering. However, the noticeable shock may lead to injury
(e.g. resulting from a startled reaction etc.).
Note
Three-Phase Systems
All conductors (L1, L2, L3 and N) must be measured
against PE!
Note
The instrument’s batteries are exposed to excessive
stress during insulation resistance measurement. For this
reason it’s advisable to perform individual rather than
continuous measurements.
5.3 Ending the Measurement
Individual measurement: Measurement is ended automatically as
soon as the measured value has settled in.
Continuous measurement is ended by briefly pressing the ESC key.
In either case, the measured value is retained at the 7-segment
display. When discharging begins, the unit of measure for the bar
graph changes from Ωto V. The length of the bar graph is contin-
uously reduced as voltage at the device under test drops.
Special Case: Capacitive Devices Under Test
Caution!
If measurement is performed at a capacitive object such
as a long cable, it becomes charged with up to approx.
1000 V (test voltage)! Touching such objects is life en-
dangering!
When an insulation resistance measurement has been performed
on a capacitive object it is automatically discharged by the instru-
ment. Contact between the object and the instrument must nev-
ertheless not be interrupted. Do not disconnect until:
•Thecaution LED (> 50 V) is no longer illuminated
•Thehigh-voltage symbol is no longer displayed
•Theanalogbar graph has dropped to a value of less than 50 V
M
MAN
DATA ISO 500 V
100
k
1
G
10
k
1
M
10
G
100
G
100 M
10
M
3.25
UISO/INS
M
MAN
DATA ISO 500 V
3.25
U
ISO/INS
RISO/RINS
= const.
0
25V
50V
500V
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6 Measuring Direct, Alternating and
Pulsating Voltage – V Function
You can measure direct voltage, as well as sinusoidal alternating
voltage with frequencies ranging from 45 to 65 Hz with this test
instrument.
ÐSelect the V measuring function with the rotary switch.
ÐSelect the desired voltage type with the scroll keys:
direct voltage (DC),
alternating voltage (AC TRMS)
or pulsating voltage (DC + AC TRMS)
ÐConnect the measurement cables to the +and COM jacks.
ÐContact the measuring point with both test probes.
The measured value is displayed directly (without pressing the
START key) in analog format at the bar graph and in digital format
at the 7-segment display.
ÐAfter completing the measurement, switch the instrument off
by turning the rotary switch to the OFF position.
The ESC, START and CONTIN. keys are disabled in this case.
Note
Input impedance for the voltage measuring range is
10 MΩ.
L1
L2
N
PE
L3
RBRE
Max.
1.2 kV
U
+COM
+COM SHIELD
V
TRMS
AC
DC
0
1000V
390
110V
230V
DC / AC
DC
AC
V
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7 Measuring Resistance – kΩ/ΩFunction
(METRISO BASE/TECH)
ÐConnect the device under test to the +and COM jacks.
Resistance can only be measured at voltage-free objects. If mains
voltage or external voltage is applied to the measurement inputs,
measurement cannot be started.
This is indicated by the high-voltage symbol which appears at the
display.
ÐSelect measuring function kΩor Ωwith the rotary switch.
ÐStart an individual measurement by briefly pressing the START
key, or initiate continuous measurement by briefly pressing
the CONTIN key.
DATA blinks at the display until the measured value has settled in.
kΩ
+
COM
Rx
Rx
0V !
!
DATA
20.4
0
1000
START
ENTER
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8 Measuring Low-Value Resistance (up to 10 Ohm)
– RLO Function
According to the regulations, the measurement of low-value resis-
tance at protective conductors, earth conductors or equipotential
bonding must be performed with (automatic) polarity reversal of
the test voltage, or with current flow in one or the other direction.
Attention!
!
In the measuring function RLO, measurements are per-
formed with currents about 200 mA.
Please check before measuring whether your DUT or
your circuit is designed for these high current values.
Connection
Note
Low-value resistance can only be measured at voltage-
free objects.
ÐConnect the device under test to the +and COM jacks.
ÐSelect the Rlo measuring function with the rotary switch.
Attention!
!
The measurement cannot be started until the test probes
are in contact with the device under test.
If voltage is present at the device under test (U > 10 V),
the display is switched to voltage measurement. The dis-
play is not returned to low-resistance measurement until
voltage is less than approximately 8 V. If resistance is
greater than 10 Ω, OL pears at the display.
+COM
RLO
+COM SHIELD
R < 10 Ω
RLO
Rx
0V!
!
RLO
AUTO
Ω→
¬Ω
---
Rlo
START
ENTER
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