Gossen MetraWatt METRISO G1000, METRISO G500, METRISO G500MM Operating Instructions Manual

METRISO G500/G1000 and METRISO G500MM

Insulation and Resistance Measuring Instruments

3-349-609-03

2/4.11

Operating Instructions

2 GMC-I Messtechnik GmbH

Features Overview of Both Instrument Variants Scope of delivery:

1 Insulation and resistance measuring instrument
1 DKD calibration certificate
1 Set batteries (8 ea. in battery holder)
1Carrying strap
1 Alligator clip
1 KS17-4 cable set
1 Condensed operating instructions
1 CD ROM with following content:

– Complete operating instructions (English and German)
– Data sheet

Battery Compartment Lid and Location of the Fuses
(housing bottom)

METRISO G1000 G500 G500MM

Article number M550C M550D (M550E)

Measurements

R

ISO

U = 1000 V 3 ——

R

ISO

U = 50, 100, 250, 500 V 33

3

R 10 ... 10 k 33

3

R

LO

0.01 ... 10  33—

U 0 ... 1000 V 3 ——

U 0 ... 500 V 33

3

Display functions

Backlit display 33

3

Limit value LED (green/red) for:
Additional acoustic signal,
limit value per VDE 0100

R

INS RLORINS RLO

R

INS

LED for dangerous contact voltage

(when switched off)

33

3

LCD symbol for external voltage 33

3

Battery level display 33

3

Special Functions

Discharge capacitive devices under test 33

3

Safety shutdown (UBatt < 8 V) 33

3

Features

Measuring categories CAT II 1000 V / CAT III 600 V 3 ——

Measuring category CAT I I I 600 V 33

3

10 M test resistance 33—

DKD calibration certificate 33

3

a b

Replacement Fuse

Fuse

Battery Compartment Lid

GMC-I Messtechnik GmbH 3

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

1

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 (available presumably as of 2

nd

quarter 2011)

Battery Holder

Battery Compartment Lid

Battery Holder
Contacts

Battery

Contact
Spring

User Interface

Compartment

+

COM

+

COM

SHIELD

Shielded

Cable

Te st

Resistor

Te st
Resistor

Measuring

Test Probe with
Control Keys

1

10 M

Connector with

Shielded Cable,

Option KS-C (Z541F)

(G500/G100G500/G1000)

Connections

4 GMC-I Messtechnik GmbH

User Interface (Example METRISO G1000)

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

1

2

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

– Discharge voltage for Riso/Rins

for Riso/Rins & R

menu

from standby
state

measurement

GMC-I Messtechnik GmbH 5

Digital Display Symbols

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 (G1000/G500):

special case for automatic low-resistance measure
ment with measurement in both directions of current
flow: both measured values are displayed where Rlo > 10%

5 Low-resistance measurement (G1000/G500):

polarity reversal display (reversed current flow
direction)  or 

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
8

ISO xxxV:

Insulation resistance measurement: selected test voltage

9  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

M Vk

TRMS

AC

DC

Rlo>10%

MAN

DATA
ZERO

G

ISO

2500V

1000 V

Tk

1

00

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

6 GMC-I Messtechnik GmbH

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

– R

iso/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/ Function ................................19

8 Measuring Low-Value Resistance

(up to 10 Ohm)

– R

LO

Function (METRISO G500/G1000) ..................................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 ) – 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 ..................................... 29

12 Maintenance ........................................................................... 29

12.1 Battery and Rechargeable Battery Operation ................................ 29

12.2 Fuses ............................................................................................. 29

12.2.1Fuse Link – FUSE Message ........................................................................29

12.3 Housing ......................................................................................... 30

13 Recalibration ........................................................................... 31

14 Appendix ................................................................................. 31

14.1 Sample Connection Layouts for Insulation Resistance Measurement 31

14.2 Optional Accessories (not included) ..............................................34

15 Repair and Replacement Parts Service

Calibration Center and Rental Instrument Service ............................. 35

16 Product Support ...................................................................... 35

GMC-I Messtechnik GmbH 7

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 G500/G1000 insulation and resistance measuring instru­ments allow for quick and efficient testing of protective measures
in accordance with DIN VDE 0100, ÖVE-EN 1 (Austria), SEV 3755
(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

8 GMC-I Messtechnik GmbH

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.

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 stresses due to transport

• After long periods of storage under unfavorable conditions
(e.g. humidity, dust or extreme temperature)

Meaning of Symbols on the Instrument

Warning concerning a source of danger
(attention: observe documentation!)

Protection class II device

CAT II Device assigned to measuring categories

G1000: CAT II 1000 V / CAT III 600 V
G500/G500MM: CAT III 600 V

EC mark of 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”.

!

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.

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.

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.

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.

Attention!

!

The instrument may only be placed into service if the
battery compartment lid is securely fastened!

10 GMC-I Messtechnik GmbH

3.3 Query and Set Device Parameters

– 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

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

GMC-I Messtechnik GmbH 11

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
(

METRISO G500/G1000

)

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:

1nFo

 SET rlead

zero / Clear 

Low-resistance measurement as described in section 8.1 is con­ducted 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 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
pressing the ENTER key, you’re provided with the opportunity of
performing 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.

Parame­ter

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
(METRISO G500/G1000)

START

ENTER

START

ENTER

START

ENTER

START

ENTER

START

ENTER

12 GMC-I Messtechnik GmbH

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 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.

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 measur­ing 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.d iSP

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

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 vio­lations 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 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.

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

14 GMC-I Messtechnik GmbH

4 General Operation

The test leads are connected to the “+” and “COM” jacks.
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 G range”, see diagram). Be sure to observe color coding.

4.1 Switching On, Monitoring and Switching Off

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

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).

KS-C
(Z541F)

+

C

O

M

S

H

I

E

L

D

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 (METRISO G500/G1000).

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 (METRISO G500/G1000).

External voltage when off and during discharge

2

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

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

GMC-I Messtechnik GmbH 15

Testing the LED which Indicates the Detection of External Voltage
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

Acoustic Signals

Exceeded limit values can also be indicated acoustically by set­ting the beeP parameter to on (see page 12).

The loudspeaker symbol appears in this case.

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).

METRISO G1000 G500

G500MM

(M550C) (M550D) (M550E)

Limit R

ISO

/ R

INS

50 k @ U

ISO/UINS

= 50 V 33

3

100 k @ U

ISO/UINS

= 100 V 33

3

500 k @ U

ISO/UINS

= 250 V 33

3

1M @ U

ISO/UINS

= 500 V 33

3

1M @ U

ISO/UINS

= 1000 V 3 ——

Limit R

LO

2  33—

16 GMC-I Messtechnik GmbH

5 Measuring Insulation Resistance

– R

iso/Rins

Function

5.1 Connection

Note

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  (see section 8).
This makes it possible to detect interrupted measurement
cables, which simulate high insulation resistance.

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 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.
Ð Select the measuring function and the desired test voltage

with the rotary switch, e.g. R

iSO

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

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

0

0

G

1

0

0

M

1

0

M

---

START

ENTER

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  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

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 en­dangering!

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

•The high-voltage symbol is no longer displayed

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

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

I

S

O

/

I

N

S

R

ISO/RINS

= const.

0

2

5

V

5

0

V

5

0

0

V

18 GMC-I Messtechnik GmbH

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.

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.

Note

Input impedance for the voltage measuring range is
10 M.

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

11

0

V

2

3

0

V

DC / AC

DC

AC

V

GMC-I Messtechnik GmbH 19

7 Measuring Resistance – k/ Function

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 k or  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.

k

+

C

O

M

Rx

Rx

0V !

!

DATA

20.4

0

1

0

0

0

START

ENTER

20 GMC-I Messtechnik GmbH

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

– RLO Function (METRISO G500/G1000)

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.

Connection

Note

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.

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 dis­play is not returned to low-resistance measurement until
voltage is less than approximately 8 V. If resistance is
greater than 10 , OL pears at the display.

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

+

COM

R

LO

+ COM SHIELD

R < 10 

R

LO

Rx

0V !

!

R

LO

AUTO



¬

---

Rlo

START

ENTER

GMC-I Messtechnik GmbH 21

Note

Continuous measurement, which can normally be
selected with the CONTIN key, is disabled during low­resistance measurement.

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.

After the measuring sequence has been started, the instrument
performs measurement with automatic polarity reversal, first with
current flow in one direction (), and then in the other ().
DATA blinks at the display until the measured value has settled in.
The larger (worst) measured value is displayed.  appears at
the display.

Difference > 10%

If, during measurement with automatic polarity reversal, the differ­ence between  and  is greater than 10%, the resistance
values for both polarities (current flow directions) are displayed
separately (separated by an underscore). Rlo>10% appears at
the display.

Limit Value Indication

If the measured value is less than or equal to 2 , the Limit LED
lights up green. If the measured value is greater than 2 , 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 polar-

ity reversal. Measurement with automatic polarity reversal may
lead to varying and/or inflated measurement values, and thus to
an ambiguous reading.



¬

Rlo>10%:

&

AUTO: 

DATA

00.1

DATA

00.7

Rlo

07.0.1

Rlo>10%



Rlo 

DATA

Limit

< Limit R

LO

= OK 3



Rlo  10% ? 
Rlo > 10% ? &

22 GMC-I Messtechnik GmbH

8.2 Measurement with Manual Polarity Reversal
– 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

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

sired current flow direction:
MAN and  or MAN and  appear at the display.

Ð Start individual measurement by briefly pressing the START

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.

DATA

ZERO

00.1

DATA

ZERO

00.7

Rlo 

Rlo 



¬

MAN: Rlo 
MAN: Rlo 

MAN

MAN

GMC-I Messtechnik GmbH 23

8.3 Taking Measurement Cables and Extension Cables into

Account (up to 10 ) – 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 fur-
ther 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

Offset

is subtracted. Perform low-resistance

measurement as described above in the preceding pages.

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 M test resistor to this
end.

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

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

iSO/iNS

measuring function with the rotary switch,

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

iSO

100V.

Ð Press the start key and view the measurement results.

+

COM

10M



+ COM SHIELD

R

ISO/RINS

10 M

METRISO G1000

METRISO G500

24 GMC-I Messtechnik GmbH

10 Characteristic Values

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)“

Meas.

Qty.

U

iSO

Range Measuring Range

Reso­lution

Te st

Current

Intrinsic Uncertainty

Measuring

Uncertainty

Overload Capacity

RISO

50 V

100 V

G500(MM): 250 V / 500 V

G1000: 250 V / 500 V / 1000 V

100 k 10.0 k ... 99.9 k 0.1 k

I

N

= 1 mA

I

K

 3.6 mA

(5% rdg. + 3 d) (7% rdg. + 3 d)

METRISO G500(MM):

600 V AC/DC TRMS

METRISO G1000:

1000 V AC/DC TRMS

1 M 100 k ... 999 k 1 k

10 M 1.00 M ... 9.99 M 10 k

100 M 10.0 M ... 99.9 M 100 k

1 G 100 M ... 999 M 1 M

10 G 1.00 G ... 9.99 G 10 M

100 G 10.0 G ... 99.9 G 100 M (8% rdg. + 3 d) 3)(10% rdg. + 3 d)

3)

200 G 100 G ... 199 G 1 G (25% rdg. + 5 d) 3)(50% rdg. + 20 d)

3)

U

AC/DC

METRISO G500

METRISO MM500

100 V 10.0 V ... 99.9 V 0.1 V

(2.5% rdg. + 3 d) (5% rdg. + 3 d) 600 V AC/DC TRMS

500 V 100 V ... 510 V

1)

1 V

METRISO G1000

100 V 10.0 V ... 99.9 V 0.1 V

(2.5% rdg. + 3 d) (5% rdg. + 3 d) 1000 V AC/DC TRMS

1000 V 100 V ... 999 V

2)

1 V

RLO

METRISO G500

METRISO G1000

10  0.17 ... 9.99 

0.01



I

N

 200 mA (2.5% rdg. + 3 d) (5% rdg. + 3 d)

METRISO G1000:

1000 V AC/DC TRMS

METRISO G500:

600 V AC/DC TRMS

R

Display range as of

01.0 

100  10.0 ... 99.9  0.1 

I

N

 1 mA (2.5% rdg. + 3 d) (5% rdg. + 3 d)

METRISO G1000:

1000 V AC/DC TRMS

METRISO G500(MM):

600 V AC/DC TRMS

1 k 100 ... 999  1 

10 k 1.00 ... 9.99 k 10 

GMC-I Messtechnik GmbH 25

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

rectified value < 1%
Battery voltage 9.5 V 0.1 V
Test resistance 10 M1%

Electrical Safety

Standard
VDE regulation VDE 0411, part 1, 1994-03
Protection class II
Pollution degree 2
Measuring category G1000: CAT II 1000 V / CAT III 600 V

G500/G500MM: CAT III 600 V
Fuses
Fuse link FF315mA/1000V, effective in all resis-

tance measuring ranges, 1 additional

replacement fuse in the battery compart-

ment

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

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* when the
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).

Service life For R

ISO

(1000 V / 1 M) and RLO with 20
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

Safety shutdown If supply voltage is too low, the instrument

is switched off, or cannot be switched on.
When the rotary switch is set to the OFF
position, the instrument is completely dis­connected from the batteries (after
approximately 10 seconds).

26 GMC-I Messtechnik GmbH

Electromagnetic Compatibility (EMC)

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

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)

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 (with device
switched off)
or a residual voltage after insulation testing
(U > 50 V)

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

!

GMC-I Messtechnik GmbH 27

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

Display Values in Consideration of Measuring Uncertainty

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

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

IP XY

(1

st

digit X)

Protection Against

Foreign Object Entry

IP XY

(2nd digit Y)

Protection Against

Penetration by Water

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

Limit Value

Minimum

Display Value

Limit Value

Minimum

Display Value

020 k 025 k
100 k 111 k 100 M 111 M
200 k 219 k 200 M 219 M
500 k 541 k 500 M 541 M

0.20 M 0.25 M

0.50 M 0.57 M

1.00 M 1.11 M 1.00 G 1.11 G

2.00 M 2.19 M 2.00 G 2.19 G

5.00 M 5.41 M 5.00 G 5.41 G

10.0 M 11.1 M 10.0 G 11.1G

20.0 M 21.9 M 20.0 G 22.6 G

50.0 M 54.1 M 50.0 G 55.9 G

Limit Value

Maximum

Display Value

Limit Value

Maximum

Display Value

0.15  0.11 

0.20

 0.16  5.00  4.72 

0.50  0.44  10.0  9.47 

1.00  0.92  20.0  17.7 

2.00  1.87  50.0  44.7 

28 GMC-I Messtechnik GmbH

Voltage at Device Under Test During Insulation Resistance
Measurement

Measuring voltage Ux at the device under test depending upon its
resistance Rx at nominal voltage UN = 100, 250, 500 and 1000 V
(G1000 only):

100

Ux/V

R

x

/k

U

N

= 100 V

0

20

40

60

80

100

100

Ux/V

R

x

/k

U

N

= 250V

0

50

100

150

200

250

0

100

200

300

400

500

500

U

N

= 500V

Ux/V

R

x

/k

0

200

400

600

800

1000

1

U

N

= 1000V

Ux/V

R

x

/M

GMC-I Messtechnik GmbH 29

11 List of Abbreviations and their Meanings

Voltage

U

ISO

Test voltage or nominal voltage

U AC/DC Measured voltage (sinusoidal alternating voltage)

Resistance

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

tance
Offset Correction value for measurement cable resistance
R

ISO

Insulation resistance
R

LO

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. 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).

Attention!

!

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)!

30 GMC-I Messtechnik GmbH

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.

Attention!

!

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.

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 not subject to the RoHS
directive.

We identify our electrical and electronic devices (as of
August 2005) in accordance with WEEE 2002/96/EC
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 batteries or rechargeable batteries in your instrument or
accessories 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.

Pb Cd Hg

GMC-I Messtechnik GmbH 31

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 DKD or factory calibration for you
at our calibration laboratory. Further information is available at our
website:

www.gossenmetrawatt.com ( Services  DKD Calibration
Center or  FAQs  Question and Answers Regarding Calibra­tion).

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

* 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.

14 Appendix

14.1 Sample Connection Layouts for Insulation Resistance
Measurement

Insulation Resistance Measurement per DIN VDE 0100, Part 600

L1

L2

L3

N

PE

Between each active conductor and ground

L1

L2

L3

PEN

Between each active conductor and the PEN conductor

32 GMC-I Messtechnik GmbH

Insulation Resistance Measurement in Different Types of Systems

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

TN–S

• With or without consumer

• N – PE, separately

TN–C

• With or without consumer

• N – PE, together

GMC-I Messtechnik GmbH 33

TT

• With or without consumer

3-phase current (switched at all poles)

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

34 GMC-I Messtechnik GmbH

14.2 Optional Accessories (not included)

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)

KS-C (material no. Z541F)

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

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 2 alli­gator clips which can be plugged onto the test probe

Z550A (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 (available presumably as of 2nd quar­ter 2011)

GMC-I Messtechnik GmbH 35

15 Repair and Replacement Parts Service

Calibration Center* and Rental Instrument Service

If required please contact:

GMC-I Service GmbH

Service Center

Thomas-Mann-Str. 20
90471 Nürnberg, Germany
Phone: [phone]
Fax: [phone]
e-mail: [e-mail]
www.gmci-service.com

This address is only valid in Germany.
Please contact our representatives or subsidiaries for service in

other countries.

* Calibration laboratory for measured electrical quantities

DKD – K – 19701, accredited
in accordance wit DIN EN ISO/IEC 17025:2005

Accredited quantities: direct voltage, direct current value, direct current resistance,
alternating voltage, alternating current value, AC active power, AC apparent power,
DC power, capacitance, frequency, temperature

Competent Partner

GMC-I Messtechnik GmbH is certified in accordance with
DIN EN ISO 9001:2008.

Our DKD calibration laboratory is accredited by the Deutscher
Kalibrierdienst (German Calibration Service) under registration
number DKD–K–19701 in accordance with DIN EN ISO/
IEC 17025:2005.

We offer a complete range of expertise in the field of metrology:
from test reports and proprietary calibration certificates right on up to
DKD calibration certificates.

Our spectrum of offerings is rounded out with free test equipment
management.

An on-site DKD calibration station is an integral part of our service
department. If errors are discovered during calibration, our spe­cialized personnel are capable of completing repairs using original
replacement parts.

As a full service calibration laboratory, we can calibrate instru­ments from other manufacturers as well.

16 Product Support

If required please contact:

GMC-I Messtechnik GmbH

Product Support Hotline

Phone: [phone]
Fax: [phone]
e-mail [e-mail]

Edited in Germany  Subject to change without notice  PDF version available on the Internet

GMC-I Messtechnik GmbH
Südwestpark 15
90449 Nürnberg, Germany

Phone:[phone]
Fax: [phone]
e-mail: [e-mail]
www.gossenmetrawatt.com