Gossen Metrawatt M550P, M550O, M550N User manual

Operating Instructions

METRISO INTRO, BASE, TECH

Insulation, Low Resistance and Voltage Measurement Instrument

3-349-812-03

4/8.19

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Features Overview of Both Instrument Variants Scope of delivery:

a b

Replacement Fuse

Fuse

Battery Compartment Lid

METRISO INTRO BASE TECH
Article number M550N M550O M550P
Measurements

U = 1000 V

R

INS

R

U = 250, 500 V ✓✓✓

INS

R

U = 50, 100 V — ✓✓

INS

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

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 II I 600 V / CAT IV 300 V

Measuring category CAT II I 600 V / CAT IV 300 V
10 MΩ test resistor

DAkkS calibration certificate

✓

—

✓
✓ —
✓

✓

R

INS RLORINS RLORINS RLO

—

✓
✓

✓
✓

✓ —
✓

—

—

—

✓

✓✓
✓✓

✓

✓✓

✓✓

✓✓

✓✓
✓✓

✓✓
✓✓

✓
✓✓
✓✓
✓✓

1 Insulation and resistance measuring instrument
1 DAkkS calibration certificate (not METRISO INTRO)
1 Set batteries (8 ea. in battery holder) (not METRISO INTRO)
1Carrying strap
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)

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Inserting the Battery Holder (side view) Connections (housing top)

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 Pr o b e w i t h
Control Keys

1

10 MΩ*

Connector with

Shielded Cable,

Option KS-C (Z541F)

(G500/G100G500/G1000)

Connections

GUARD*

* not METRISO INTRO

1

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Z550A 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

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 G

ISO

2500V
1000 V

Tk

1

0

0

k

1

G

1

0

k

1

M

1

0

G

0

1

0

0

0

V

12

0

0

G

1

0

0

M

1

0

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 & R

LO

– Discharge voltage for Riso/Rins

* not

METRISO INTRO

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Digital Display Symbols

M

Vk

TRMS

AC

DC

Rlo>10%

MAN

DATA
ZERO

G

ISO

2500V
1000 V

T

k

1

0

0

k

1

G

1

0

k

1

M

1

0

G

0

1

0

0

0

V

1

2

0

0

G

1

0

0

M

1

0

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

1 Battery level indicator
2 Digital display with decimal point and polarity display
3 MAN: Low-resistance measurement:

manual measuring range selection active

4 Rlo: 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 ΔRlo > 10%

5 Low-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

7 DC/AC: Selected current type

ISO xxxV:

8

Insulation resistance measurement: selected test voltage

9 Ω V: 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

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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 – kΩ/Ω Function (METRISO BASE/TECH) .......19

8 Measuring Low-Value Resistance (up to 10 Ohm) – R

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

Function ......20

LO

9 Test Resistor for Insulation Measurement for Checking the

Insulation Measuring Instrument ............................................ 23

10 Characteristic Values .............................................................. 24

List of Abbreviations and their Meanings ..................................... 28

11

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 measur­ing 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 addi­tional 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 bond­ing 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:

•Systems set-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 measure­ment cable:

• Floor covering electrostatic discharge capability

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2 Safety Features and Precautions

!

XY123

2019-08

D-K

15080-01-01

Consecutive number

Registration number
Date of calibration (year – month)

Deutsche Akkreditierungsstelle GmbH – calibration lab

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.
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.

When used for its intended purpose,

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 per­sonnel 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 ser­vice 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 II I 600 V / CAT IV 300 V

Indicates European Conformity

The device and included batteries may not be dis­posed 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.

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3 Initial Start-Up

Attention!

!

Attention!

!

Attention!

!

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.

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.

Ð Loosen both slotted screws for the battery compartment lid

on the back, and remove the lid.

Ð Remove the battery holder and insert eight 1.5 V size AA bat-

teries with correct polarity in accordance with the symbols.

Make sure that all of the batteries are inserted with correct
polarity. If just one battery is inserted with reversed polar­ity, it will not be recognized by the instrument and may
result in leakage from the batteries.

Ð Push 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.

Ð Replace the battery compartment lid and retighten the

screws.

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

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

– SETUP Function

Ð Turn the rotary switch to the SETUP position.

info appears at the display.

Ð Press ENTER to query battery voltage or firmware version.
Ð Then 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

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List of all parameters (alphabetical order)

Note

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

Parame­ter

0.d iSP
A.d iSP
APoFF
bAtt

bEEP
blight

Com

1nfo
liled
SET
uErS

ion
rlead

Page: Header

13: 0.diSP – Show/Hide Leading Zeros

12: A.diSP – Analog Display: Select Display Mode

12: APoFF – Specified Time for Automatic Shutdown and Continuous ON

11: bAtt – Query Battery Voltage

12: bEEP – Acoustic Indication of Exceeded Limit Values

12: bLiGt – Switching LCD Illumination On/Off

For service purposes only

11: Querying Parameters – InFo Menu (as moving letters)

13: LiLEd – Optical Indication of Limit Value Violations

11: Entering Parameters – SEt Menu

11: vErSion – Query Firmware Version

11: rLEAd – Offset Resistance for Low-Resistance Measurement

3.3.2 Querying Parameters – InFo Menu (as moving letters)

bAtt – Query Battery Voltage

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.

Ð Connect the measurement cables to the + and COM jacks.
Ð Short circuit the two test probes connected to the measure-

ment cables (including extension cables).

Ð Select 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:

 SET rlead

1nFo

zero / Clear 

Low-resistance measurement as described in section 8.1 is con­ducted in both directions with automatic polarity reversal.

If the test probes are not short circuited, the SHort LEAdS
prompt appears at the display.

1nFo bAtt: 12.05 V.

The measurement results, i.e. the resistance of the two measure­ment cables, are subtracted from future low-resistance measure­ments as an offset value, and ZERO appears in the footer.

After selecting the CLEAr parameter and acknowledging by press-

vErSion – Query Firmware Version

ing the ENTER key, you’re provided with the opportunity of per-
forming future measurements without using the offset. If this is the

1nFo bAtt:  uErS ion: 1.0.0

GMC-I Messtechnik GmbH 11

case, ZERO is no longer displayed. In this case, measurement
cable resistance is included in the measurement.

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APoFF – Specified Time for Automatic Shutdown and Continuous ON

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

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 ser­vice 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.

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)

 SET rlead  ... ...  APoFF

1nFo

10 ... 59 min on



A.diSP – Analog Display: Select Display Mode

One of two different display modes can be selected for the analog
display:

• bArG: bar graph

(10 minutes = default setting)

• Po int: pointer



1nFo

SET rlead  ...  A.d iSP

bLiGt – Switching LCD Illumination On/Off

Automatic deactivation of display illumination after xx seconds

bArG / Po int



(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 measur­ing function is selected or started, illumination is reactivated.

(po int = default setting)

When set to oFF, illumination is permanently deactivated.

1nFo  SET rlead  ... ...  bligt

15 / 30 / 45 / 90 s off 

(15 seconds = default setting)

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0.diSP – Show/Hide Leading Zeros

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

ESC

stby OFF

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



3.3.4 Default Settings

Previously entered changes can be undone, and default settings
can be restored. This may be advisable under the following cir­cumstances:

• After the occurrence of software or hardware errors

• If you are under the impression that the instrument does not
work correctly

Ð Disconnect the device from the measuring circuit.
Ð Briefly remove the batteries (see also section 3.2).
Ð Press and hold the key,

and reinsert the batteries.

LiLEd – Optical Indication of Limit Value Violations

This parameter allows you to decide whether or not limit value vio-

After hearing two acoustic signals, the instrument has been
restored to its default settings.

lations will be indicated optically.
on = optical indication activated

1nFo

 SET rlead  ... ...  liled

on / off 

(on = default setting)

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4 General Operation

+

C

OM

S

HI

E

L

D

KS-C
(Z541F)

Limit

Green

Limit

Red

!

Red

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 con­sisting of measurement cable
and high-resistance measure­ment cable for measurements
in the GΩ range”, 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 instru­ment 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 comple­tion of an automatic measuring sequence, and after the predeter­mined 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 func­tion 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

LED Status Function – Cause

Limit value indication

– Measured insulation resistance does not violate the limit

value.

– Measured low-resistance Rlo does not violate the limit

value.

Limit value indication

– 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

Dangerous voltage of greater than 50 V is present at the mea­surement 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 mea­surement inputs.

LCD Status Functions

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

Display

1

Prerequisite: The LiLEd parameter is set to on (see page 13).

2

Function testing should be executed regularly (see following section on testing
LEDs).

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

1

1

2

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Testing the LED which Indicates the Detection of External Voltage

Limit

when Switched Off – OFF Switch Position

Ð Apply a voltage of greater than 50 V (+ and COM jacks).
Ð Turn the rotary switch to the V position.
Ð Read the voltage value at the LCD.
Ð Turn 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

METRISO INTRO BASE TECH

)

(M550O) (M550P)

33

33

333

333

3

—

333

3

Limit

/ R

R

ISO

Limit R

INS

LO

50 kΩ @ U
100 kΩ @ U
500 kΩ @ U

1 MΩ @ U
1 MΩ @ U

2 Ω

ISO/UINS

ISO/UINS

ISO/UINS

ISO/UINS

ISO/UINS

(M550N

= 50 V —

= 100 V —

= 250 V

= 500 V

= 1000 V

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 RLO < 2 Ω (Continuity test)
– Insulation

Measurement

: Signal

when

R

INS

< 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 measure­ment 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 dis­play (see AdiSP parameter on page 12).

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5 Measuring Insulation Resistance – Riso/Rins Function

Note

L1
L2

N
PE

L3

R

B

R

E

+

COM

R

ISO

+ COM SHIELD

Rx

0V !

!

R

ISO

R

INS

MAN

DATA

ISO

500V

1

0

0

k

1

G

1

0

k

1

M

1

0

G

1

00

G

1

0

0

M

1

0

M

---

START

ENTER

5.1 Connection

Checking the Measurement Cables

Before performing insulation measurement, the test
probes on the measurement cables should be short-cir­cuited in order to assure that the instrument displays a
value very close to 0 Ω (see section 8). This makes it pos­sible to detect interrupted measurement cables, which
simulate high insulation resistance.
For this instrument,
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.

Ð Connect 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

5.2 Performing the Measurement

Note: Condensation must be ruled out when performing measure-

ments at close to the freezing point.
Ð Select the measuring function and the desired test voltage

with the rotary switch, e.g. R

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
initiate continuous measurement by briefly pressing the

fuse testing

is only performed after swit-

which appears at the display.

100V.

iSO

START

CONTIN

key, or

key.

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DATA blinks at the display until the measured value has settled in.

Attention!

!

Note

Note

Caution!

M

MAN

DATA

ISO

500 V

1

0

0

k

1

G

1

0

k

1

M

1

0

G

1

0

0

G

1

0

0

M

1

0

M

3.25

U

ISO/INS

M

MAN

DATA

ISO

500 V

3.25

U

ISO

/

IN

S

R

ISO/RINS

= const.

0

2

5

V

5

0

V

5

0

0

V

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 Ω to V. The length of the bar graph is contin­uously reduced as voltage at the device under test drops.

Special Case: Capacitive Devices Under Test

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.).

When an insulation resistance measurement has been performed
on a capacitive object it is automatically discharged by the instru­ment. Contact between the object and the instrument must nev­ertheless not be interrupted. Do not disconnect until:

•The caution LED (> 50 V) is no longer illuminated

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 en­dangering!

•The high-voltage symbol is no longer displayed

Three-Phase Systems

All conductors (L1, L2, L3 and N) must be measured

•The analog bar graph has dropped to a value of less than 50 V

against PE!

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.

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6 Measuring Direct, Alternating and

Note

L1
L2

N
PE

L3

R

B

R

E

Max.

1.2 kV

U

+

COM

+ COM SHIELD

V

TRMS

AC

DC

0

1

0

0

0

V

390

1

1

0

V

2

3

0

V

DC / AC

DC

AC

V

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.

Ð Select the V measuring function with the rotary switch.
Ð Select the desired voltage type with the scroll keys:

direct voltage (DC),
alternating voltage (AC TRMS)
or pulsating voltage (DC + AC TRMS)

Ð Connect the measurement cables to the + and COM jacks.
Ð Contact 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.

Ð After 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.

Input impedance for the voltage measuring range is
10 MΩ.

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7 Measuring Resistance – kΩ/Ω Function

kΩ

+

C

O

M

Rx

Rx

0V !

!

DATA

20.4

0

1

0

0

0

START

ENTER

(METRISO BASE/TECH)

Ð Connect 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.

Ð Select measuring function kΩ or Ω with the rotary switch.
Ð Start 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.

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8 Measuring Low-Value Resistance (up to 10 Ohm)

Attention!

!

Note

Attention!

!

+

COM

R

LO

+ COM SHIELD

R < 10 Ω

R

LO

Rx

0V !

!

R

LO

AUTO

Ω→

¬Ω

---

Rlo

START

ENTER

– R

Function

LO

According to the regulations, the measurement of low-value resis­tance 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.

In the measuring function RLO, measurements are per­formed with currents about 200 mA.
Please check before measuring whether your DUT or
your circuit is designed for these high current values.

Connection

Low-value resistance can only be measured at voltage­free objects.

Ð Connect the device under test to the + and COM jacks.
Ð Select the Rlo measuring function with the rotary switch.

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 dis­play 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.

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Ω→

←Ω

ΔRlo>10%:

←Ω & Ω

→

AUTO: Ω→

DATA

00.1

DATA

00.7

Rlo

07._0.1

Δ Rlo>10%

Ω→

Rlo ←Ω

DATA

Limit

< Limit R

LO

= OK 3

←Ω

ΔRlo ≤ 10% ? ←Ω→
ΔRlo > 10% ? ←

Ω & Ω→

Measurement Types

You can choose one of two different types of measurement:

• Measuring sequence with automatic polarity reversal (reversal
of current flow direction)

• Manual measurement with specified current flow direction

8.1 Measurement with Automatic Polarity Reversal – AUTO Function

Automatic polarity reversal is selected as a default value. MAN
does not appear at the display.

Ð Start measurement in both current flow directions by briefly

pressing the START key for one-time polarity reversal or start
continuous measurement for permanent polarity reversal by
briefly pressing the CONTIN. key.

After the measuring sequence has been started, the instrument performs
measurement with automatic polarity reversal, first with current flow in
one direction (
until the measured value has settled in. The larger (worst) measured value
is displayed.

Difference > 10%

If, during measurement with automatic polarity reversal, the difference
between
both polarities (current flow directions) are displayed separately (sepa­rated by an underscore). ΔRlo>10% appears at the display.

Limit Value Indication

If the measured value is less than or equal to 2 Ω, the Limit LED
lights up green. If the measured value is greater than 2 Ω, the LED
lights up red. As a prerequisite, the LiLED parameter must be set
to “on” (see page 13).

Resistances which do not demonstrate a stable value until after a
“settling in period” should not be measured with automatic polar­ity reversal. Measurement with automatic polarity reversal may

Ω→

), and then in the other (←Ω).

←Ω→

appears at the display.

Ω→

and ←Ω is greater than 10%, the resistance values for

DATA

blinks at the display

lead to varying and/or inflated measurement values, and thus to
an ambiguous reading.

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8.2 Measurement with Manual Polarity Reversal

DATA

ZERO

00.1

DATA

ZERO

00.7

Rlo Ω→

Rlo ←Ω

Ω→

←Ω

MAN: Rlo Ω→
MAN: Rlo ←Ω

MAN

MAN

– MAN Function

In order to determine whether or not the obtained results are inde­pendent of current flow direction, measurement can be per­formed separately for both directions.

Ð Press the

sired current flow direction:
MAN and Ω→ or MAN and ←Ω appear at the display.

Ð Start 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.

Differing results indicate voltage at the device under test (e.g.
thermovoltage or unit voltages).

Measurement results can be distorted by parallel connected
impedances at load current circuits and by equalizing current,
especially in systems which make use of “overcurrent protection
devices” (previous neutralization) without an isolated protective
conductor. Resistances which change during measurement (e.g.
inductance), or a poor contact, can also cause distorted mea­surements.

Examples of resistances whose values may change during mea­surement include:

– Incandescent lamp resistance with changing values caused

by warming due to measuring current

– Resistances with a large inductive component
In order to assure unambiguous measurement results, causes of

error must be located and eliminated.

 scroll keys to this end, depending upon the de-

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8.3 Taking Measurement Cables and Extension Cables into

Note

+

COM

10M

Ω

+ COM SHIELD

R

ISO/RINS

10 MΩ

METRISO BASE

METRISO TECH

Account (up to 10 Ohm) – ZERO Function (Roffset)

Measurement cable ohmic resistance can be subtracted from the
measurement results automatically. Proceed as follows:

Ð With the switch in the SETUP position and the SET menu at the

display, select the rLEAd parameter. Refer to page 11 for fur­ther instructions.

During future low-resistance measurements for which cable resis­tance is to be taken into account, ZERO appears at the display
and cable resistance R
measurement as described above in the preceding pages.

is subtracted. Perform low-resistance

Offset

9 Test Resistor for Insulation Measurement for

Checking the Insulation Measuring Instrument

According to section 5.3.1.2 of VDE 0105-100 (EN 50110-1), the
following applies: “These measuring instruments must be tested
before, and if applicable after use.”
The two outermost jacks on the connection panel must be con­nected to each other internally via a 10 MΩ test resistor to this
end.

The sum of test resistor and cable resistance (for both cables),
including test probes, amounts to 10 MΩ ±5%. This value allows
for quick self-testing.

The cable resistance R
under parameter rLEAd can only be deleted under this
parameter by selecting setting CLEAr, see page 11.

GMC-I Messtechnik GmbH 23

which is stored in menu SET

Offset

Ð Connect the measurement cables to the + and COM jacks.
Ð Insert the test probes into the above described jacks.
Ð Select the R

as well as the desired test voltage, e.g. R

Ð Press the start key and view the measurement results.

measuring function with the rotary switch,

iSO/iNS

iSO

100V.

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10 Characteristic Values

Meas.

Qty.

UiSO Range Measuring Range

100 k 10.0 kΩ ... 99.9 kΩ 0.1 k

1 M 100 kΩ ... 999 kΩ 1 k

10 M 1.00 MΩ ... 9.99 MΩ 10 k

RINS

BASE/TECH: 50 V

BASE/TECH: 100 V

INTRO: 250 V ... 1000 V

BASE: 250 V / 500 V

100 M 10.0 MΩ ... 99.9 MΩ 100 k

1 G 100 MΩ ... 999 MΩ 1 M

10 G 1.00 GΩ ... 9.99 GΩ 10 M

100 G 10.0 GΩ ... 99.9 GΩ 100 M ±(8% rdg. + 3 d) 3)±(10% rdg. + 3 d)

TECH: 250 V / 500 V / 1000 V

200 G 100 GΩ ... 199 GΩ 1 G ±(25% rdg. + 5 d) 3)±

100 V 10.0 V ... 99.9 V 0.1 V

500 V 100 V ... 510 V

100 V 10.0 V ... 99.9 V 0.1 V

1000 V 100 V ... 999 V

AC/

DC

U

METRISO BASE

METRISO INTRO
METRISO TECH

RLO 10 Ω 0.17 ... 9.99 Ω

R

METRISO TECH

Display range as of 01.0

1)

Display range up to 600 V

2)

Display range up to 1.2 kV

3)

the indicated accuracy is only achieved with the shielded high-resistance measur­ing cable KS-C (article no. Z541F)“

4)

does not conform to DIN EN 61557-2

5)

up to 5 Ω

METRISO BASE

100 Ω 10.0 ... 99.9 Ω 0.1 Ω

1 kΩ 100 ... 999 Ω 1 Ω

Ω

10 kΩ 1.00 ... 9.99 kΩ 10 Ω

Reso­lution

1)

1 V

2)

1 V

0.01 Ω4 V < U0

Open-Circuit

Voltage U

0max

Te st

Current

Intrinsic Uncertainty

Measuring

Uncertainty

50 V /100 V:

1.25 U

ISO

IN = 1 mA

±(5% rdg. + 3 d) ±(7% rdg. + 3 d)

250 V /
500 V /

1000 V:

1.1 U

≤ 5 mA

I

K

ISO

(50% rdg. + 20 d)

— ±(2.5% rdg. + 3 d) ±(5% rdg. + 3 d)

— ±(2.5% rdg. + 3 d) ±(5% rdg. + 3 d)

< 6 V

U0 max. 15 V

200 mA ≤ I

I ≤ 260 mA

1 mA ≤ I

I ≤ 1,3 mA

±(2.5% rdg. + 3 d) ±(5% rdg. + 3 d)

±(2.5% rdg. + 3 d) ±(5% rdg. + 3 d)

Overload
Capacity

METRISO BASE:
600 V AC/DC

METRISO INTRO
METRISO TECH:

3)

3) 4)

600 V AC/DC

1000 V AC/DC

METRISO BASE:

600 V AC/DC

METRISO INTRO
METRISO TECH:

1000 V AC/DC TRMS

METRISO BASE:

600 V AC/DC

METRISO TECH

1000 V AC/DC TRMS

TRMS

TRMS

TRMS

TRMS

TRMS

TRMS

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Reference Conditions

Reference temperature+ 23 °C ±3 K
Relative humidity 40 ... 75%
Measured quantity

frequency 45 Hz ... 65 Hz
Measured quantity

waveform Sine, deviation between TRMS and

Battery voltage 9.5 V ±0.1 V
Test resistance 10 MΩ±1%

rectified value < 1%

Electrical Safety

Standard
VDE regulation VDE 0411, part 1, 1994-03
Protection class II
Pollution degree 2
Measuring category METRISO INTRO/TECH:

CAT II 1000 V / CAT III 600 V / CAT IV 300 V
METRISO BASE:

CAT II I 600 V / CAT IV 300 V
Fuses
Fuse link FF315mA/1000V, effective in all resis-

tance measuring ranges, 1 additional

replacement fuse in the battery compartment
Elektronic fuse for protecting low-resistance and resis-

tance measurement R

LO

and R

Power Supply

Batteries 8 ea. 1.5 V mignon cells (8 ea. size AA)

(alkaline manganese per IEC LR14)
or 8 rechargeable NiMH batteries (must be

recharged externally)
Nominal range of use 8.5 ... 12 V
Battery test Battery capacity display with battery sym-

bol in 4 segments: .

Querying of momentary battery voltage via

menu function.
Battery saver circuit Automatic shutdown of display illumination

Service life For R

Safety shutdown If supply voltage is too low, the instrument

after 15 second s (after the last time the

rotary switch is actuated) can be set via

the blight parameter.

The test instrument is automatically

switched to the standby mode*

measured value remains unchanged and none

of the controls are activated during this time.

* Specified time “APoFF” (entered in minutes)

adjustable via SETUP menu (default setting
approx. 10 min).

(1000 V / 1 MΩ) and RLO with 20

ISO

second on-time and 1 measurement each

for a duration of 5 seconds

– With batteries (alkaline manganese):

900 measurements

– With rechargeable batteries (2000 mAh):

850 measurements

is switched off, or cannot be switched on.

When the rotary switch is set to the OFF

position, the instrument is completely dis-

connected from the batteries (after

approximately 10 seconds).

when the

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Electromagnetic Compatibility (EMC)

!

Interference emission EN 61326-1:2006 class B
Interference immunity EN 61 326-1:2006

Ambient Conditions

Accuracy
temperature range 0 ... +40 °C

Operating temperature –10 ... +50 °C
Storage temp. range –25 ... +70 °C (without batteries)
Relative humidity Up to 75%

(max. 85% during storage/transport),

no condensation allowed
Elevation Max. 2000 m
Calibration interval 1 year (recommended)

Mechanical Design

Dimensions 225 x 130 x 140 mm
Weight Approx. 1.4 kg with batteries
Protection Housing: IP 52, measurement cables and

connectors: IP 40 per DIN VDE 0470,
part 1 / EN 60529,
housing category 2

Extract from table on the meaning of IP codes

IP XY

st

digit X)

(1

2 ≥ 12.5 mm dia. 2 Dripping (at 15° angle)
3 ≥ 2.5 mm dia. 3 Spraying water
4 ≥ 1.0 mm dia. 4 Splashing water
5 Dust protected 5 Jet-water
6 Dust-proof 6 Powerful water jets

Protection Against

Foreign Object Entry

IP XY

(2nd digit Y)

Protection Against

Penetration by Water

Displays

Digital display With additional bar graph or pointer

depending on selection with a.disp
parameter, backlit (transflective);
leading zeros can be suppressed at the
digital display depending on 0.disp
parameter;
overranging indicated with 0L at display;
dimensions: 65 x 36 mm

Limit LED LED lights up red to indicate an exceeded

limit value
LED lights up green to indicate adherence
to the limit value

LED LED lights up red to indicate:

– the presence of an external voltage

bevore insulation testing
with the device switched on or off
(device switched off not with M550N)

– the presence of the test/measuring voltage

during (insulation) measurement (U > 50 V)
the presence of a residual voltage
after insulation testing (U > 50 V)
with the device switched on or off

at LCD Detection of external voltage at the LCD

with the device switched on where U DC >
50 V and U AC > 40 V (50 Hz) for all mea­suring functions

(U > 50 V)

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Display Values in Consideration of Measuring Uncertainty

100

Ux/V

R

x

/kΩ

U

N

= 100 V

0

20

40

60

80

100

250

Ux/V

R

x

/kΩ

U

N

= 250V

0

50

100

150

200

250

Table for determining minimum display values for insulation resis­tance in consideration of the instrument’s measuring uncertainty.

Limit Value

020 kΩ 025 kΩ
100 kΩ 111 kΩ 100 MΩ 111 MΩ
200 kΩ 219 kΩ 200 MΩ 219 MΩ
500 kΩ 541 kΩ 500 MΩ 541 MΩ

0.20 MΩ 0.25 MΩ

0.50 MΩ 0.57 MΩ

1.00 MΩ 1.11 MΩ 1.00 GΩ 1.11 GΩ

2.00 MΩ 2.19 MΩ 2.00 GΩ 2.19 GΩ

5.00 MΩ 5.41 MΩ 5.00 GΩ 5.41 GΩ

10.0 MΩ 11.1 MΩ 10.0 GΩ 11.1GΩ

20.0 MΩ 21.9 MΩ 20.0 GΩ 22.6 GΩ

50.0 MΩ 54.1 MΩ 50.0 GΩ 55.9 GΩ

Minimum

Display Value

Limit Value

Table for determining maximum display values for low-value resis­tance in consideration of the instrument’s measuring uncertainty.

Limit Value

0.15 Ω 0.11 Ω

0.20 Ω 0.16 Ω 5.00 Ω 4.72 Ω

0.50 Ω 0.44 Ω 10.0 Ω 9.47 Ω

1.00 Ω 0.92 Ω 20.0 Ω 17.7 Ω

2.00 Ω 1.87 Ω 50.0 Ω 44.7 Ω

Maximum

Display Value

Limit Value

Minimum

Display Value

Maximum

Display Value

Voltage at Device Under Test During Insulation Resistance
Measurement

Measuring voltage Ux at the device under test depending upon its
resistance R

at nominal voltage UN = 100, 250, 500 and 1000 V:

x

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11 List of Abbreviations and their Meanings

0

100

200

300

400

500

500

U

N

= 500V

Ux/V

R

x

/kΩ

0

200

400

600

800

1000

1

U

N

= 1000V

Ux/V

R

x

/MΩ

Voltage

U

ISO

U AC/DC Measured voltage (sinusoidal alternating voltage)

Test voltage or nominal voltage

Resistance

LIMIT Limit value for insulation resistance or low-value resis-

tance
Offset Correction value for measurement cable resistance
R

ISO

R

LO

Insulation resistance

Low-value resistance (cable resistance)

Fuse

FUSE “Blown fuse” message

12 Maintenance

12.1 Battery and Rechargeable Battery Operation

When only one filled segment remains in the battery symbol,
install a new set of batteries or charge the rechargeable batteries.

Check to make sure that no leakage has occurred at batteries or
rechargeable batteries at short, regular intervals, or after the
instrument has been in storage for a lengthy period of time.

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Note

Prior to lengthy periods of rest (e. g. holiday), we recom-

Attention!

!

Attention!

!

mend removing the (rechargeable) batteries. This helps to
prevent excessive depletion or leakage of batteries,
which, under unfavourable circumstances, may cause
damage to the instrument.

If leakage has occurred, the electrolyte must be carefully and
completely removed with a damp cloth before installing new bat­teries.

Replacing the Batteries

See section 3.2 and section 12.3.

12.2 Fuses

If a fuse has blown due to overload, a corresponding message
error appears at the LCD panel. The instrument’s voltage measur­ing ranges are nevertheless still functional.

12.2.1 Fuse Link – FUSE Message

This fuse is active in all resistance measuring ranges except for
voltage measurement. A replacement fuse is included in the bat­tery compartment (FF315mA/1000V).

Disconnect the instrument from the measuring circuit be­fore opening the battery compartment lid in order to re­place the fuse (refer to page 5 for location)!

Checking the Fuse

If a resistance measuring range is selected with the rotary switch
with a blown or defective fuse in the instrument, and if the instru­ment is turned on with the switch in this position, fuse appears at
the LCD. Prerequisite: The + and COM measurement jacks are not
short circuited.

After eliminating the cause of error and replacing the defective
fuse, the fuse message is cleared after the instrument has once
again been switched on.

Severe damage to the instrument may occur if incorrect
fuses are used.
Only original fuses from GMC-I Messtechnik GmbH as­sure required protection by means of suitable blowing
characteristics.
Short-circuiting of fuse terminals or the repair of fuses is
prohibited!
The instrument may be damaged if fuses with incorrect
ampere ratings, breaking capacities or blowing charac­teristics are used!

Replacing the Fuse

Ð Open the battery compartment lid by loosening the two

screws.

Ð Remove the defective fuse and insert a new one. A replace-

ment fuse is included in the battery compartment.

Ð Insert the new fuse.
Ð Replace the battery compartment lid and retighten the

screws.

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12.2.2 Electronic Fuse

Note

Pb Cd Hg

This fuse protects low-resistance (Rlo) and resistance measure­ments (kΩ) from overloading (electronic hardware circuit).

„EL.Fu“ appears when the fuse blows.
Ð Eliminate the cause of overloading. This error message must

be cleared by switching to OFF position.

12.3 Housing

No special maintenance is required for the housing. Keep outside
surfaces clean. Use a slightly dampened cloth or a plastic cleaner
for cleaning. Avoid the use of cleansers, abrasives or solvents.

Return and Environmentally Sound Disposal

The instrument is a category 9 product (monitoring and control
instrument) in accordance with ElektroG (German electrical and
electronic device law). This device is subject to the RoHS direc­tive. Furthermore, we make reference to the fact that the current
status in this regard can be accessed on the Internet at
www.gossenmetrawatt.com by entering the search term WEEE.

We identify our electrical and electronic devices in
accordance with WEEE 2012/19/EU and ElektroG
using the symbol shown at the right per DIN EN 50419.

These devices may not be disposed of with the trash.
Please contact our service department regarding the return of old
devices (see address in section 15).

If you use
ries which no longer function properly, they must be duly disposed of in
compliance with the applicable national regulations.
Batteries or rechargeable batteries may contain harmful substances or
heavy metal such as lead (PB), cadmium (CD) or mercury (Hg).

They symbol shown to the right indicates that batteries or recharge­able batteries may not be disposed of with the trash, but must be
delivered to collection points specially provided for this purpose.

batteries

or

rechargeable batteries

in your instrument or accesso-

13 Recalibration

The measuring tasks performed with your instrument, and the
stressing it’s subjected to, influence aging of its components any
may result in deviation from the specified levels of accuracy.

In the case of strict measuring accuracy requirements, as well as
in the event of use at construction sites with frequent stress due
to transport and considerable temperature fluctuation, we recom­mend a relatively short calibration interval of once per year. If your
instrument is used primarily in the laboratory and indoors without
considerable climatic or mechanical stressing, a calibration inter­val of once every 2 to 3 years is sufficient as a rule.

During recalibration* at an accredited calibration laboratory (DIN
EN ISO/IEC 17025), deviations from traceable standards demon­strated by your measuring instrument are documented. Ascer­tained deviations are used to correct displayed values during later
use of the instrument.

We would be happy to perform DAkkS or factory calibration for
you at our calibration laboratory. Further information is available at
our website:

www.gossenmetrawatt.com (→ COMPANY → Quality and Certif­icates → DAkkS-Calibration Center).

Recalibration of your instrument at regular intervals is essential for
the fulfillment of requirements according to quality management
systems per DIN EN ISO 9001.

The device should be regularly calibrated in a calibration
laboratory which is certified according DIN EN ISO/
IEC 17025.

* Examination of the specification, as well as adjustment, are not included in calibra-

tion. However, in the case of our own products, any required adjustment is per­formed and adherence to the specification is confirmed.

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14 Appendix

L1

L2

L3

N

PE

Between each active conductor and ground

L1

L2

L3

PEN

Between each active conductor and the PEN conductor

L1

L2

L3

N

PE

Between each active conductor (phase and neutral
conductors) and ground

L1

L2

L3

PEN

Between each active conductor and the PEN conductor

14.1 Sample Connection Layouts for Insulation Resistance Measurement

Insulation Resistance Measurement per DIN VDE 0100, Part 600

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Insulation Resistance Measurement in Different Types of Systems

TN–S

• With or without consumer

•N – PE, separately

TN–C

• With or without consumer

• N – PE, together

TT

• With or without consumer

3-phase current (switched at all poles)

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GMC-I Messtechnik GmbH 33

Caution:

– Open the overcurrent protective device
– Disconnect the N conductor
– Jumper the L and N conductors
– Insulation measurement between L conductors and N to PE
– Device switch can be open – if single-pole

In the distributor: individual and combined measurements

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14.2 Attaching the strap to the test instrument

Front

Feed the strap through from the front
of the test instrument and secure it
with the slotted screw (M3).

Back

1

Bottom Right

Detach the strap from the instrument:
Turn out the slotted screw (M3) at the
bottom.

Bottom Left

Strap

Clasp

Clasp

Front View

2

Slide the strap through the test probe
holder.

Eyelet for Attachment to Tester (METRISO ...)

Side View

14.3 Attaching the Test Probe Holder to the Carrying Strap

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14.4 Technical Data for Measurement Cables

Attention!

!

3

Front

Feed the strap through from the front
of the test instrument and secure it
with the slotted screw (M3).

Back

(scope of delivery: KS17-4 safety cable set)

Electrical Safety

Maximum rated voltage 600 V

Measuring category

Max. rated current: 1 A 1 A 16 A
With safety cap attached
Without safety cap ——

CAT IV CAT III CAT II

1000 V

1000 V

••

—

•

Ambient Conditions (EN 61010-031)

Temperature –20 °C ... + 50 °C
Relative humidity Max. 80%
Pollution degree

2

Using the KS17-4

Observe the instrument’s maximum values for 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
test probe at the end of the measurement cable.

In order to establish contact inside 4 mm jacks, the safety caps
have to be removed by prying open the snap fastener with a
pointed object (e.g. the other test probe).

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14.5 Optional Accessories (not included)

(G500/G1000)

START/STOP SHIELD COM

Option Z550A

+

ISO Calibrator 1 (material no. M662A)

Calibration adapter for testing the accuracy of instru­ments used for measuring insulation resistance and
low-resistance for test voltages up to 1000 V (per VDE
0413, parts 1, 2, 4 and 10)

Test Probe for Remote Triggering

(material no. Z550A)
Optional plug-on measurement cable with a triggering
key on the test probe and an additional key for illumi­nating the measuring point, including shielded, plug-in
connector cable.

KS-C (material no. Z541F)

Cable set consisting of measurement cable and
shielded high-resistance measurement cable for mea­surements in the GΩ range

KY95-3 (material no. Z110J)

(

METRISO BASE/TECH: scope of delivery 1 piece)

Alligator clips (1 pair) for KS17-4 and KS-C

1081 probe (material no. GTZ3196000R0001)

Triangular probe for floor measurements per EN 1081,
DIN VDE 0100-600 (Standing-Surface Insulation)

KS24 (material no. GTZ3201000R0001)

Cable set consisting of a 4 m long extension cable with
a permanently attached test probe at one end and a
contact protected socket at the other end, and 1 alli­gator clip which can be plugged onto the test probe

36 GMC-I Messtechnik GmbH

14.5.1

Application Test Probe for Remote Triggering (Option Z550A)

When inserting
the 3-pole plug,
make sure that
the jack plug is
inserted in the
START/STOP
position. Press
and align the 3­pole plug such
that it is placed
flush on the con­nection terminal.
This is the only
way to assure
that the three
contacts of the
jack plug are
properly con­nected with the command cables.

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