Gossen MetraWatt M234D Bedienungsanleitung

METRAport40S

Digital Multimeter

3-349-412-02

8/12.18

Operating Instructions

2 GMC-I Messtechnik GmbH

Control Elements

1LCD

2 Battery compartment cover

3 mA, A connector jack for direct measurement of current to “max. 10 A”

4 A connector jack for current clamp measurement to “max. 30 V”

5 Connector jack for all measuring ranges except current measuring ranges

6“”connector jack for all measuring ranges

7OFF/ON: ON/OFF switch

8 Resettable miniature circuit breaker (AUTO FUSE)

9 Rotary switch for function selection

10 Eyelet for carrying strap

MAN/AUTO

: Key for manual and automatic measuring range selection

12 DATA and MIN/MAX: Key for measured value storage

13 FUNC: Multifunction key

GMC-I Messtechnik GmbH 3

Digital Display Symbols

1 Continuous operation

2 Battery voltage display

3 Digital display with indication of decimal place and polarity

4 Manual measuring range selection

5 Display memory, “freeze measured value”

6 MIN-MAX storage

7 ZERO: zero balancing active

8 Selected current type, DC ()or DCAC ( )

9 USB Interface display

(when communication is active is displayed)

10 Unit of measure

11 Over-ranging

12 RPM measurement: Upm1/Upm2 (at 2/4 stroke engines)

13 Pointer for analog display

14 Analog display scale

15 Resistance thermometer: Pt100 / Pt1000

16 Thermocouple: type K

17 Current clamp measurement active

18 Negative analog display range exceeded

19 Transformer ratio (clip factor)

20 Acoustic signal activated (e.g. for continuity testing)

21 Diode measurement

134 8

11131418

5 6

4 GMC-I Messtechnik GmbH

Contents......................................................................................................................... Page

1 Safety Features and Precautions ............................................................................5

2 Initial Start-Up .........................................................................................................7

3 Selecting Measuring Functions and Measuring Ranges .........................................8

3.1 Automatic Measuring Range Selection ........................................................................8

3.2 Manual Measuring Range Selection – MAN/AUTO Key .................................................8

3.3 Quick Measurements .................................................................................................9

4 Display (LCD) ...........................................................................................................9

4.1 Display Illumination ....................................................................................................9

4.2 Digital Display ...........................................................................................................9

4.3 Analog Display ..........................................................................................................9

5 Measured Value Storage – DATA / MIN-MAX Key .................................................10

5.1 DATA (hold / compare) .............................................................................................10

5.2 Storage of Minimum and Maximum Values “MIN/MAX” with Time Stamp ....................11

6 Voltage and Frequency Measurement ...................................................................12

6.1 Low-Voltage Measurement .......................................................................................13

7 Current Measurement ...........................................................................................13

7.1

Current Measurement with Current (Clamp) Sensors with Voltage Output ........................... 14

7.2 RPM Measurement at combustion engines ................................................................15

8 Resistance Measurement ......................................................................................16

9 Continuity Testing .................................................................................................16

10 Diode Testing ........................................................................................................17

11 Capacitance Measurment .....................................................................................18

12 Frequency Measurement – Duty Cycle Measurement ..........................................18

13 Temperature Measurement with Pt100 and Pt1000 .............................................19

14 Temperature Measurement with Type K Thermocouple .......................................19

15 Characteristic Values .........................................................................................20

16 Maintenance .........................................................................................................26

16.1 Batteries .................................................................................................................26

16.2 Fuses ......................................................................................................................26

16.3 Housing / Opening of Equipment / Repair ..................................................................27

16.4 Device Return and Environmentally Compatible Disposal ............................................27

17 Multimeter Messages ...........................................................................................27

18 Repair and Replacement Parts Service

Calibration Center* and Rental Instrument Service ...............................................28

19 Product Support ....................................................................................................28

GMC-I Messtechnik GmbH 5

1 Safety Features and Precautions

You have selected an instrument which provides you with a high level of safety.

This instrument fulfills the requirements of the applicable EU guidelines and

national regulations. We confirm this with the CE marking. The relevant declara-

tion of conformity can be obtained from GMC-I Messtechnik GmbH.

The analog/digital multimeter has been manufactured and tested in accordance

with safety regulations IEC 61010–1:2010/DIN EN 61010–1:2011/VDE 0411–

1:2011. If used for its intended purpose, safety of the operator, as well as that of

the instrument, is assured. However, safety cannot be guaranteed if the instru-

ment is used improperly or handled carelessly.

In order to maintain flawless technical safety condition, and to assure safe use, it is

imperative that you read the operating instructions thoroughly and carefully before placing

your instrument into service, and that you follow all instructions contained therein.

For your safety, as well as for protection of your multimeter, the instrument is

equipped with a miniature circuit breaker for the 10 A current measuring range.

Observe the following safety precautions

• The instrument may only be operated by persons who are capable of recog-

nizing contact hazards and implementing appropriate safety precautions.

Contact hazards exist anywhere, where voltages of greater than 33 V RMS

may occur.

• Avoid working alone when taking measurements which involve contact

hazards. Be certain that a second person is present.

• Maximum allowable voltage between terminals (3), (4), (5), (6) and ground is equal to

300 V, category II.

• The current measuring range A is equipped with a magnetic circuit breaker.

Max. allowable voltage at the meas. circuit (= miniature circuit breaker nominal

voltage) is equal to 240 V~ (AC) and 50 V (DC) against earth in the “mA”

and “A” ranges.

• The instrument may only be used for current measurement in power systems if the

electrical circuit is protected with a fuse or a circuit breaker with a rating of up to

20 A, and if nom. voltage at the system does not exceed 240 V~ (AC) or 50 V (DC).

In order to conform to the CAT requirements, an additional slow-blowing fuse link

(T16A/500V) has been fitted in series with the miniature circuit breaker which can

only be replaced by service personnel once it is tripped.

• Be prepared for the occurrence of unexpected voltages at devices under test

(e.g. defective devices). For ex., capacitors may be dangerously charged.

• Make certain that the measurement cables are in flawless condition, e.g. no

damage to insulation, no interruptions in cables or plugs etc.

• No measurements may be made with this instrument in electrical circuits

with corona discharge (high-voltage).

• Special care is required when measurements are made in HF electrical

circuits. Dangerous pulsating voltages may be present.

• Measurements under moist ambient conditions are not permitted.

6 GMC-I Messtechnik GmbH

• Be absolutely certain that the measuring ranges are not overloaded beyond

their allowable capacities. Limit values can be found in the “Measuring

Ranges” table in chapter 15, “Characteristic Values”.

Meaning of symbols on the instrument

Warning concerning a point of danger

(Attention: observe documentation!)

Earth

Continuous doubled or reinforced insulation

CAT I I Measurement category II device

Indicates CE conformity

The 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.

Calibration mark (blue seal):

Repairs, Parts Replacement and Balancing

When the instrument is opened, voltage conducting parts may be exposed. The

instrument must be disconnected from the measuring circuit before repair,

replacement of parts or balancing. If repair or balancing of a live, open instrument

is required, this may only be carried out by trained personnel who are familiar

with the dangers involved.

Defects and Extraordinary Strains

If it may be assumed that the instrument can no longer be operated safely, it

must be removed from service and secured against unintentional use.

Safe operation can no longer be relied upon:

• If the instrument demonstrates visible damage

• If the instrument no longer functions

• After long periods of storage under unfavorable conditions, e.g. humidity,

dust, excessive temperature (see “Ambient Conditions” on page 25).

Serial number

Registration number

Date of calibraion (year – month)

German Accrediation Body GmbH – Calibration lab

XY123

2012-08

D-K-

15080-01-01

GMC-I Messtechnik GmbH 7

2 Initial Start-Up

Installing Batteries

Attention!

Disconnect the instrument from the measuring circuit at all poles before

opening the battery compartment!

➭Fold the instrument closed.

➭Insert a coin or a similar object into the slot between the housing and the

battery compartment cover and press down until the battery compartment

cover snaps open.

➭Fold the instrument open as far as it will go and remove the battery

compartment cover.

➭Insert two 1.5 V mignon batteries per IEC R6 or IEC LR6 into the battery

compartment, making sure they are poled in accordance with the symbols.

➭Replace the battery compartment cover and press into position until it

audibly snaps into place.

Switching the Instrument On

➭Set the toggle switch to the “ON” position.

Activation of the instrument is acknowledged with an acoustic signal.

If the instrument has been shut down automatically, press either the FUNC, DATA or

MAN key to switch the multimeter back on, or set the toggle switch to the “OFF”

position and leave it there for at least 5 s before returning it to the “ON” position.

Note!

Electrical discharges and high frequency interference may lead to erro-

neous display values, and may disable the measuring sequence. Reset

the instrument by switching it off and then, after 5 s, back on again.

Switching the Instrument Off Manually

➭

Set the toggle switch to the “OFF” position and fold the instrument closed. The

battery is automatically disconnected when the multimeter is folded closed.

Automatic Shutdown (standby)

The instrument switches itself off automatically if the measured value remains

constant for a long period of time (maximum measured value fluctuation approx.

0.8% of the measuring range per minute, or 1 Celsius or 1 Fahrenheit per min-

ute), and if no keys are activated for a period of approximately 10 minutes. Shut-

down is acknowledged by a brief acoustic signal. Exception: continuous opera-

tion mode.

Note!

Electrical power is supplied to the processor even after the instrument

has been switched off automatically. A closed-circuit current of about

200 A remains. The instrument is only disconnected from the batteries

after it has been switched off manually with the toggle switch or with the

instrument folded.

8 GMC-I Messtechnik GmbH

Disabling Automatic Shutdown

The instrument can be switched to “CONTINUOUS ON”.

➭Press the FUNC key while switching the instrument on with the toggle switch

until an acoustic signal is generated. The “CONTINUOUS ON” function

is indicated at the display with the symbol.

3 Selecting Measuring Functions and Measuring Ranges

3.1 Automatic Measuring Range Selection

The multimeter is equipped with auto-ranging for all measuring ranges except for

temperature measurement, diode and continuity testing. Auto-ranging is always

activated as soon as the instrument is switched on. Depending upon the mea-

sured quantity, the device automatically selects the measuring range which

allows for best possible resolution.

The instrument automatically switches to the next highest or next lowest

measuring range for the following measured quantities:

3.2 Manual Measuring Range Selection – MAN/AUTO Key

Auto-ranging can be deactivated and ranges can be set manually in accordance

with the following table.

The manual mode is deactivated by pressing and holding the MAN/AUTO key for

about 1 s, by turning the rotary switch or by switching the instrument off and

back on again.

Measuring Ranges Resolution

Switching to the next

highest range occurs

at(... d + 1 d)

Switching to the next

lowest range occurs 1)

at (... d –1 d)

V , V , A , mA ,

A,, 30 mF, Hz, 4 ¾ 31 000 2 800

30 nF 300 F 3 ¾ 3 100 280

Key

MAN/AUTO Function Acknowledgement

Visual Acoustic

brief Manual mode active: utilized measuring range is fixed MAN 1 x

brief

Switching sequence for:

V: 300 mV 3V30 V 300 V 600 V 300 mV 

A: 300 A3mA30 mA 300 mA 3A10 A 

300 A

:30M30  300 3k30 k300k

3M30 M

F: 30 nF 300 nF 3 F30 F300 F30 nF 

Hz:

300 Hz



3kHz



30 kHz



300 kHz



1MHz



300 Hz



: 3.0000 30.000 300.00 3.0000 

MAN 1 x

long Return to automatic measuring range selection — 2 x

GMC-I Messtechnik GmbH 9

3.3 Quick Measurements

If you wish to perform quicker measurements than those possible with the auto-

matic measuring range selection function, make sure to establish the appropriate

measuring range:

•bymanual measuring range selection, i. e. by selecting the measuring range

with the best resolution, see chapter 3.2.

•viaDATA function, see chapter 5. After the first measurement, the proper

measuring range will be automatically determined so that measurements are

performed more rapidly from the second measured value onwards.

With both functions, the established measuring range is maintained for the sub-

sequent series mode measurments.

4Display(LCD)

4.1 Display Illumination

After the instrument has been switched on, background illumination can be acti-

vated by briefly pressing the DATA/MIN/MAX and MAN/AUTO keys simultane-

ously. Illumination is switched back off by once again pressing the same keys, or

automatically after approximately 1 minute.

4.2 Digital Display

The measured value appears at the digital display with decimal point and sign (+

or -). The selected unit of measure and the type of current are displayed as well.

A minus sign is displayed to the left of the value for the measurement of zero-

frequency quantities if the positive pole of the measured quantity is applied to the

jack.

If the measuring range upper limit is exceeded for the following measured

quantities, “OL” (overload) is displayed:

V (DC), I (DC), Hz, V~ (AC), I~ (AC), 30 mF: 30999 digits

30 nF 300 F: 3099 digits

The digital display is refreshed at different rates for the individual measured

quantities (see “Display Refresh Rates” on page 24.

4.3 Analog Display

The analog display with simulated pointer and dynamic response equivalent to

that of a moving-coil mechanism, is refreshed 20 times per second. This display

is especially advantageous for the observation of measured value fluctuations,

and during balancing.

The analog display is equipped with a polarity indicator. The scale is extended 5

segments into the negative range for the measurement of zero-frequency

quantities, allowing for precise observation of measured value fluctuation around

the zero point. If the measured value exceeds the display range, a triangle is first

display at the left, and polarity at the display is reversed approximately 0.7

seconds later. If the measuring range is exceeded (> 30999 digits, in the F range

(except 30 mF) : > 3099) a triangle is displayed at the right.

Scaling at the analog display is automatic, which is quite helpful for manual

measuring range selection.

10 GMC-I Messtechnik GmbH

5 Measured Value Storage – DATA / MIN-MAX Key

5.1 DATA (hold / compare)

Measured values can be automatically frozen at the display with the DATA (hold)

function. This is especially useful when full attention is required for contacting the

measuring point. After the measured value has been applied to the multimeter

and the “condition” indicated in the following table has been fulfilled, the mea-

sured value is frozen at the digital display and an acoustic signal is generated.

The test probes can then be removed from the measuring point, and the mea-

sured value can be read from the digital display. If the measured value is less

than the limit value shown in the table, the instrument is reactivated for a new

measurement with the DATA hold function.

If the new measured value deviates from the previous value by less than 100 dig-

its, the acoustic signal sounds twice (DATA compare).

1) Reactivation occurs if the indicated measured value limits are fallen short of.

2) Double acoustic signal after the first measured value has been stored.

Thereafter, double acoustic signal only occurs if the currently frozen value deviates from the

first stored value by less than 100 digits.

3) Exception: 10% at 300 

Key: MR = measuring range

The DATA function has no effect on the analog display, which continues to

indicate the current measured value. However, it must be observed that the

decimal place is fixed when the digital display is “frozen”.

The DATA function can be deactivated by pressing and holding the DATA key for

about 1 second, by turning the function selector switch or by switching the

instrument off and back on again.

Function

DATA

Key

DATA

Condition Reaction at Instrument

Measuring

Ranges

Measured Value

Limits

(digits)

Display Acoustic

Signal

Measured

Value, Digital DATA

Activate brief blinks 1 x

Hold V, A, F, Hz, %

, ,

> 3.3% of MR

OL3)

> 3.3% 3)

of range

displayed

1 x

2 x 2)

Reactivate 1) V, A, F, Hz, %

, ,

< 3.3% of MR

OL3)

< 3.3% 3)

of MR

frozen

measured

value

blinks

Deactivate long is

cleared

cleared 2 x

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