Gossen MetraWatt METRISO 5024 Bedienungsanleitung

Operating Instructions

METRISO5024

Insulation and Resistance Measuring Instrument

with Voltage Measuring Range

3-349-346-03

4/2.21

2 Gossen Metrawatt GmbH

Figure 1 Controls

1 Measuring probe on housing (positive pole)

2 Scale

2a Adjusting screw for mechanical zero balancing

3Rotary switch for

– Low-resistance measurement (toggle switch in position)

– 100 V/250 V/500 V:

Toggle switch in neutral position:

Voltage measurement

Test for absence of voltage and discharge capacitive DUTs

Toggle switch in M position:

Insulation measurement with the selected test voltage

4Toggle switch for switching amongst V,  and M

(with illuminated scale when  or M is selected)

5 Carrying strap

6 Battery compartment

7 Detaining fork

8 Test probe on coil cord (negative pole)

9 Opening for securing the test probe

10 LED for indicating device and battery status

(see chapter 4.2 and 4.3)

Gossen Metrawatt GmbH 3

Meanings of symbols on the instrument:

European conformity

Continuous, doubled or reinforced insulation

Warning concerning a source of danger

(attention: observe documentation!)

CAT II Maximum allowable voltage between the test probes (1 and 8)

and earth is 600 V, category II.

This device 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’.

Table of Contents Page

1 Safety Precautions ...............................................................4

1.1 Defects and Excessive Stressing ..........................................................4

2 Device Description ................................................................4

2.1 Using Device ......................................................................................4

2.2 Design Description .............................................................................. 4

3 Preparation for Device Operation .........................................5

3.1 Unpacking the Device ......................................................................... 5

3.2 Power Supply – Battery Replacement ................................................... 5

3.3 Checking the Mechanical Zero Point .................................................... 5

3.4 Checking Device Functions .................................................................. 6

4 Operation ..............................................................................7

4.1 Voltage Measurement ......................................................................... 7

4.2 Insulation Resistance Measurement (VDE 0413, part 2 / EN 61557, part 2) ....... 8

4.3 Low-Resistance Measurement (VDE 0413, part 4 / EN 61557, part 4) ... 9

5 Maintenance – Recalibration ..............................................10

5.1 Housing ........................................................................................... 10

5.2 Batteries ..........................................................................................10

5.2.1 Details on Power Consumption and Operating Time ............................ 10

5.3 Replacing the Fuse ........................................................................... 10

5.4 Recalibration .................................................................................... 11

5.5 Device Return and Environmentally Compatible Disposal ..................... 12

6 Characteristic Values ..........................................................12

7 Repair and Replacement Parts Service

Calibration Center

and Rental Instrument Service ...........................................14

8 Product Support .................................................................14

4 Gossen Metrawatt GmbH

1 Safety Precautions

The METRISO 5024 insulation measuring instrument is

manufactured and tested in accordance with the following

standards:

IEC 61010-1/EN 61010-1/VDE 0411-1,

IEC 61557-2/EN 61557-2/VDE 0413-2

IEC 61557-4/EN 61557-4/VDE 0413-4

IEC 61326-1/EN 61326-1

IEC 61000-4-2/EN 61000-4-2

IEC 61000-4-3/EN 61000-4-3

IEC 61000-4-4/EN 61000-4-4

IEC 61000-4-5/EN 61000-4-5

IEC 61000-4-6/EN 61000-4-6

IEC 61000-4-8/EN 61000-4-8

In order to maintain flawless technical safety conditions, and to

assure safe use, it is imperative that you read these operating

instructions thoroughly and carefully before placing your instrument

into service, and that you follow all instructions contained herein.

1.1 Defects and Excessive Stressing

If it can be assumed that safe operation is no longer possible, the

instrument must be removed from service and secured against

inadvertent use. It must be assumed that safe operation is no longer

possible:

• If the device demonstrates visible damage

• If the instrument no longer functions

• After long periods of storage under unfavorable conditions

• After extraordinary stressing due to transport

2 Device Description

2.1 Using Device

The METRISO 5024 measuring instrument is a battery operated

combination device with direct display. It is suitable for the following

measurements:

•AC and DC voltages without indication of polarity within a range of

0 to 500 V. This function is especially well suited for testing DUTs

for absence of voltage before performing resistance or insulation

measurements.

•Low resistance measurement within a range of 0 to 4 .

Advantageous for resistance measurements at coils, over

contacts, and at equipotential bonding conductors and

protective conductors.

•Measurement of insulation resistance within a range of 100 k to

400 M. The device is suitable for measuring and testing

insulation resistance at electrical systems and devices and

allows for the selection of the following nominal voltages: 100 V,

250 V or 500 V DC.

2.2 Design Description

Thanks to its design and the use of two-hand operation (Figure 1),

the device is well suited for safe, daily use. It can be secured against

dropping with the attached carrying strap.

The METRISO 5024 includes two switches for device operation:

• Toggle switch for function selection (4)

• Rotary switch (3)

Measured values are displayed at three analog scales (2). Figure 1

shows these scales in detail. Insulation resistance is displayed at the

Gossen Metrawatt GmbH 5

uppermost scale, low-resistance at the middle scale and voltage at

the bottom scale. The device’s operating status and battery charge

level are indicated with the 2-color LED in the scale (Figure 1).

The battery compartment is located in the housing base (6). The

procedure for replacing batteries is described in 3.2.

All measurements are performed with two test probes:

• One test probe (1) is permanently attached to the housing –

positive pole.

• The other (8) is attached to a coil cord – negative pole

This test probe (8) can be inserted into the opening (9) and secured

by snapping the handle into the detaining fork (7).

As long as the toggle switch (4) is in the neutral middle position, the

METRISO 5024 can be utilized as a voltmeter.

The rotary switch must be set either to the 100 V, 250 V or 500 V

position in order to perform voltage measurements. No batteries are

required for this function.

The rotary switch must be set to the  position in order to perform

low-resistance measurements. Measurement is performed with the

toggle switch (4) in the  position. Voltage cannot be measured as

long as the rotary switch (3) remains in this position.

The desired test voltage must be selected with the rotary switch (3)

before performing insulation measurements. Measurement is

performed with the toggle switch (4) in the M position.

3 Preparation for Device Operation

3.1 Unpacking the Device

Check for mechanical damage after unpacking the device. The

device is ready for use as soon as the batteries have been inserted

into the battery compartment.

3.2 Power Supply – Battery Replacement

The METRISO 5024 is operated exclusively with batteries for safety

reasons. Batteries are inserted or replaced as follows:

➭First disconnect the measurement cables from the device under

test.

➭Loosen the fastening screw at the bottom of the battery

compartment (6) and remove the battery compartment.

➭Remove the depleted batteries and replace them with new or

fully charged batteries. Make sure that battery polarity is not

reversed during insertion (see printed symbols on the

compartment).

➭Push the battery compartment back in and secure it with the

screw.

Recommended batteries: 4 ea. alkaline batteries per LR6, mignon

cells, AA cells, 1.5 V, at least 2300 mAh

3.3 Checking the Mechanical Zero Point

➭Lay the device horizontally onto a work surface.

➭Check the pointer for correct zero point adjustment and reset

with the adjusting screw (2a) if necessary.

The device may not be connected to a measuring circuit during

this procedure, and the toggle switch may not be activated.

Don’t forget: Negative pointer deflection is suppressed by the

scale’s limit stop. Always turn the adjusting screw clockwise for

this reason, and then slowly turn it counterclockwise until the 0 

or 0 V position is reached.

6 Gossen Metrawatt GmbH

3.4 Checking Device Functions

The METRISO 5024 functions as a voltmeter when the toggle switch

(4) is in the neutral position:

➭The voltmeter function can be checked by applying a voltage to

both test probes (1 and 8), e.g. line voltage from a mains outlet.

The rotary switch must be set to any of positions 100 V, 250 V or

500 V.

➭When the toggle switch (4) is in either the  or M position, the

batteries are activated and the METRISO 5024 remains in the

selected function as long as the toggle switch is activated.

Measurements in the  and M ranges are evaluated by means

of the green LED (10), the beeper and the pointer.

➭The ohmmeter function – rotary switch in the  position and toggle

switch in the  position – can be tested by short-circuiting the

two test probes (1 and 8): 0  appears at the display,

continuous acoustic signal from the beeper.

Avoid open test probes (resistance approaching ), (pointer

oscillates, periodic sequence of acoustic signals from the

beeper).

➭The insulation measuring function – rotary switch in the xxx V

position and toggle switch in the M position – can be tested

with the help of the two limit values: Short-circuit the two test

probes (1 and 8): Pointer oscillates, periodic sequence of

acoustic signals from the beeper, green LED blinks; separate the

test probes:  appears at the displaycontinuous acoustic signal

from the beeper, green LED lights up.

Display accuracy can be tested using the ISO Calibrator 1 (article no.

M662A) as an accessory by connecting it to the low or high value

resistor.

Gossen Metrawatt GmbH 7

4 Operation

4.1 Voltage Measurement

Attention!

Before connecting the measuring instrument to an external

source of voltage, make sure that the battery compartment

has been correctly secured to the housing because the

battery connector terminals are electrically connected to the

measuring circuit!

No auxiliary power is required for voltage measurement, i.e. no

batteries need to be inserted into the battery compartment.

Direct and alternating voltages of up to 500 V can be measured

without switching between zero-frequency and periodic quantities.

Pointer deflection is always positive for the measurement of direct

voltage, regardless of polarity.

Devices under test can be conveniently tested for absence of voltage

using the voltage measuring function without activating any of the

controls. Immediately after connecting the device under test, the

instrument indicates whether or not external voltage is present.

The voltage measuring range can also be used for discharging

capacitive devices under test. The falling voltage value can be

observed at the display.

Adhere to the prescribed sequence for the performance of voltage

measurement:

➭Set the rotary switch (3) to the xxx V position.

The rotary switch may be set to any position other than !

➭Leave the toggle switch (4) in its neutral position (do

not press).

➭Contact the device under test with the test probes

(1 and 8). Read the measured value from the voltage

scale within a range of 0 to 500 V.

➭End the measurement by removing the test probes from the

device under test.



500 V

250 V

100 V



M

– (+)

+ (–)

8 Gossen Metrawatt GmbH

4.2

Insulation Resistance Measurement (VDE 0413, part 2 / EN 61557, part 2)

Attention!

Insulation resistance measurements may only be performed

on voltage-free system components and devices!

Adhere to the prescribed sequence:

➭Set the rotary switch (3) to the desired test voltage:

100 V, 250 V or 500 V.

➭Contact the device under test with the test probes

(1: positive pole and 8: negative pole).

➭When the toggle switch is in the neutral position, the

METRISO 5024 functions as a voltmeter for testing for the absence

of voltage.

Immediately after contacting the device under test, the user can

determine whether or not it is voltage-free.

A capacitively charged device under test is discharged directly via

the voltmeter’s internal resistance. Discharging can be observed

at the display. However, if the voltage value remains constant

insulation resistance cannot be measured until the device under

test has been disconnected from all sources of voltage.

If zero voltage is displayed, measurement can be performed

immediately.

➭Insulation resistance measurement is performed for as

long as the toggle switch is held in the M position.

Read the measured value from the logarithmic scale

within a range of 100 k to 400 M.

➭End the measurement by releasing the toggle switch. Capacitive

devices under test which have been charged by direct test

voltage are discharged by the voltmeter.

➭Remove the test probes from the device under test.

Attention!

When insulation resistance is measured at capacitive devices under

test, e.g. cables, they may be charged with an open-circuit voltage

of up to approximately 700 V, and may retain this charge for a

lengthy period of time. This is a life endangering voltage, and the

device under test must be discharged after measurement for this

reason (see “testing for the absence of voltage” above).

Evaluating Measured Values

According to DIN VDE 0100, the insulation resistance of system

components must have a value of at least 1000  per V nominal

voltage without any current-consuming apparatus in the line section

between two overcurrent protection devices or switches, or

downstream from the last overcurrent protection device, for example

380 k at an operating voltage of 380 V.

Insulation Resistance Scale LED Beeper

Measured value  limit value is displayed green continuous signal

Meas. value < 250 k with U N=250 V

Meas. value < 500 k with UN=500 V

value is displayed green periodic sequence

of signals

Measurement not possible:

– < 100 k

– Battery voltage too low

– Rotary or toggle switch

not adjusted correctly

pointer oscillates

green blinks

red

green blinks

periodic sequence

of signals

no signal



500 V

250 V

100 V



M

Gossen Metrawatt GmbH 9

In order to assure that the

insulation resistance limit values

specified in the applicable

standards are not exceeded,

maximum measuring error of the

measuring instrument must be

taken into consideration. The

required minimum display values

for various limit values are listed in

the following table. Intermediate

values can be interpolated in a

linear fashion.

Test Voltages

During measurement of insulation resistance, a test voltage U is applied

to the device under test, which lies between the nominal voltage U N

selected with the rotary switch (3), and open-circuit voltage U

4.3 Low-Resistance Measurement (VDE 0413, part 4 / EN 61557, part 4)

Attention!

Resistance measurements may only be performed on

voltage-free devices under test, because interference

voltages distort measurement results.

Adhere to the prescribed sequence:

➭Make sure that the device under test is voltage-free in

accordance with chapter 4.1.

➭Set the rotary switch to .

➭Contact the device under test with the test probes (1:

positive pole of the 200 mA constant current source

and 8: negative pole of the constant current source).

➭Measurement is performed for as long as the toggle

switch is held in the  position. Observe the LED.

Read the measured value from the scale within a

range of 0 to 4 . It is advisable to perform a second

measurement with reversed polarity in order to eliminate

semiconductor circuits.

➭

End the measurement by

releasing the toggle switch.

➭

Remove the test probes from

the device under test.

UN Position at Rotary Switch (3) Test Voltage at DUT

100 V 100 V < U < 110.8 V

250 V 250 V < U < 277.0 V

500 V 500 V < U < 554.0 V

Low Voltage Scale LED Beeper

measured value  2 value is displayed green continuous signal

2 measured value  4value is displayed green periodic sequence

of signals

measured value  4pointer oscillates green blinks periodic sequence

of signals

measurement not possible:

– battery voltage too low

– rotary or toggle switch

not adjusted correctly

pointer oscillates

red

green blinks

no signal

* Minimum display values for

insulation resistances with specified

limit values in consideration of

maximum measuring error.

MRange

Limit value Min. Display *

0.10 M

0.25 M

0.40 M

0.50 M

0.60 M

0.70 M

0.80 M

1 M

2 M

0.130 M

0.325 M

0.520 M

0.650 M

0.780 M

0.910 M

1.040 M

1.300 M

2.600 M



500 V

250 V

100 V



M

Voltage Drop

10 Gossen Metrawatt GmbH

5 Maintenance – Recalibration

5.1 Housing

No special maintenance is required for the housing. Keep outside

surfaces clean. Use a slightly dampened cloth for cleaning. Avoid the

use of cleansers, abrasives and solvents.

5.2 Batteries

Check the batteries at short regular intervals to makes sure no

leakage has occurred. If leakage occurs, electrolyte must be fully

removed from the instrument and new batteries must be installed.

Remove the batteries from the battery compartment if the measuring

instrument will not be used for a lengthy period of time. Refer to

chapter 3.2 regarding battery replacement

Attention: If the LED lights up red before or during measurement, the

batteries must be replaced immediately.

Use only recommended battery types (see chapter 3.2).

5.2.1 Details on Power Consumption and Operating Time

Low-Resistance Measurement

The instrument draws the most power from the batteries when the

value of the contact resistance is the lowest.

Power consumption does not exceed the value of 0.4 A.

Insulation Resistance Measurement

Power consumption from the batteries depends on the selected test

voltage and the actual value of the insulation resistance, i.e. on the

load imposed on the source of the measuring voltage UN. The table

below specifies the power consumption from the batteries for the

indicated parameters.

The following table lists the number of possible measurements with

one set of alcaline batteries by taking into account the power

consumption from the batteries.

The number of possible measurements depends on the following conditions:

• one measurement takes 1 minute

• the insulation resistance complies with the requirements of the

standard

(power consumption from the battery in accordance with

column 3 of the table above).

5.3 Replacing the Fuse

The low-resistance measuring range is protected with a fuse, see

chapter 6. The fuse blows if a voltage is applied to the test probes

which may cause damage to the instrument as a result of its

magnitude or polarity.

Adhere to the prescribed sequence when replacing the fuse:

➭Remove the test probes from the device under test.

➭Loosen the 3 screws in the housing base.

Test Voltage

RX measured at IBAT (UBAT = 6 V)

(*if LED lights up green, pointer oscillates and there is no acoustic signal,

the transformer is overloaded)

500 V 0 k / < 1 A * 0.1 M / < 1.1 A > 1 M / < 0.6 A

> 400 M / < 0.3 A

250 V 0 k / < 1 A * 0.1 M / < 0.4 A

> 500 k / < 0.4 A > 400 M / < 0.2 A

100 V 0 k / < 1 A * 0.1 M / < 0.2 A

> 200 k / < 0.3 A > 400 M / < 0.2 A

Test Voltage UNAlMn Battery min. 2300 mAh

500 V > 300 measurements

250 V > 500 measurements

100 V > 750 measurements

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