Gossen Metrawatt M246C, METRAHIT COIL User guide

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Operating Instructions

METRAHITISO and METRAHITCOIL

TRMS Multimeter with Insulation and Interturn Short-circuit Measurement (METRAHITCOIL only)

3-349-416-03

15/5.17

Standard Equipment Contact Persons

1kHz

Standard Equipment METRAHIT ISO

1 Multimeter for isolation measurement 1 Protective rubber cover 1 KS17-2 cable set 1 DAkkS calibration certificate with calibration report 2 Batteries, 1.5 V, type AA, installed 1 Condensed operating instructions *

Standard Equipment METRAHIT COIL

1 Insulation multimeter 1 Protective rubber cover 1 KS17-2 cable set 1 DAkkS calibration certificate 2 Batteries 1.5 V, type AA, installed 1 COIL TEST ADAPTER for interturn short-circuit measurement 1 Condensed operating instructions *

* Detailed operating instructions are available for download on the Internet

at www.gossenmetrawatt.com

Function METRAHITISO METRAHIT COIL V AC+DC TRMS (Ri = 1 M) V AC / Hz TRMS (Ri  9 M)



V AC+DC TRMS (Ri

9 M)

V DC (Ri  9 M) Hz (V AC) Bandwidth V AC A AC / Hz TRMS A AC+DC TRMS A DC Fuse Transformation factor Hz (A AC) Insulation Resistance M

ISO

Interturn short-circuit measurement M



COIL

Duty cycle measurement % Resistance  Continuity Diode ... 5,1 V Tem p er at ur e

TC (K) Temperature RTD Capacitance MIN/MAX / data hold 4 MBit memory

IR Interface Power pack adapter socket Protection Measuring category

For 15,000 measured values, sampling rate adjustable from 0.1 second to 9 hours

1000 V CAT II, 600 V CAT III



Filter

 

... 300 kHz ... 300 kHz

15 Hz ... 10 kHz 15 Hz ... 10 kHz

300 A

3/30/300 mA

3 A / 10 A

10 A/1000 V 10 A/1000 V

mV/A, mA/A mV/A, mA/A

... 30 kHz ... 30 kHz

adjustable test voltage adjustable test voltage

— 

         

IP54 

Filter

300 A

3/30/300 mA

3 A / 10 A

IP54

2 GMC-I Messtechnik GmbH

Contact Persons

Accessories (sensors, plug inserts, adapters, consumable materials)

The accessories available for your instrument are checked for compliance with currently valid safety regulations at regular intervals, and are amended as required for new applications. Currently up-to-date accessories which are suitable for your measuring instrument are listed at the following web address along with photo, order number, description and, depending upon the scope of the respective accessory, data sheet and operating instructions: www.gossenmetrawatt.com

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 European guidelines and national regulations. This is confirmed by means of the CE mark. A corresponding declaration of conformity can be requested from GMC-I Messtechnik GmbH.

The TRMS digital multimeter has been manufactured and tested in accordance with the following safety regulations: IEC 61010–1:2010/DIN EN 61 010–1:2011/VDE 0411–1:2011. When used for its intended purpose (see page 10), safety of the operator, as well as that of the instrument, is assured. Their safety is however not guaranteed, if the instrument is used improperly or handled carelessly.

In order to maintain flawless technical safety conditions, 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.

The multimeter is equipped with an automatic socket blocking mechanism for your safety, and in order to safeguard your instrument. This mechanism is linked to the rotary switch and only allows access to those jacks which are actually required for the selected function. It also prevents the user from turning the rotary switch to impermissible functions after the measurement cables have already been plugged in.

Measuring Categories and their Significance per IEC 61010-1

CAT Definition

Measurements in electrical circuits which are not directly connected to the

mains: e.g. electrical systems in motor vehicles and aircraft, batteries etc.

Measurements in electrical circuits which are electrically connected to the

low-voltage mains: via plug, e.g. in household, office and laboratory applications

Measurements in building installations: stationary consumers, distributor

III

terminals, devices connected permanently to the distributor

The measuring category and the maximum rated voltage which are printed on the device apply to your measuring instrument, e.g. 600 V CAT II I or 1000 V CAT II.

For the application of measuring cables see page 72.

Observe the following safety precautions:

• The multimeter may not be used in potentially explosive atmospheres.

• The multimeter may only be operated by persons who are capable of recognizing contact hazards and taking the appropriate safety precautions. Contact hazards according to the standards exist anywhere, where voltages of greater than 33 V RMS or 70 V DC may occur. Avoid working alone when taking measurements which involve contact hazards. Be certain that a second person is present.

• Maximum allowable voltage between the voltage measuring sockets or all connector sockets and ground is 1000 V for measuring category II, and 600 V for measuring category I I I.

• Be prepared for the occurrence of unexpected voltages at devices under test (e.g. defective devices). For example, capacitors may be dangerously charged.

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Safety Warnings

• 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.

• Be absolutely certain that the measuring ranges are not overloaded beyond their allowable capacities. Limit values are included in chapter 8; “Technical Data” in the table entitled “Measuring Functions and Measuring Ranges” in the “Overload Capacity” column.

• The multimeter may only be operated with installed batteries or rechargeable batteries. Dangerous currents and voltages are otherwise not indicated, and the instrument may be damaged.

• The instrument may not be operated if the fuse cover or the battery compartment lid has been removed, or if its housing is open.

• The input for the current measuring range is equipped with a fuse link. Maximum permissible voltage for the measuring circuit (= rated voltage of the fuse) is 1000 V AC/DC. Use specified fuses only (see page 65)! The fuse must have a

breaking capacity of at least 30 kA.

Opening of Equipment / Repair

The equipment may be opened only by authorized service personnel to ensure the safe and correct operation of the equipment and to keep the warranty valid.

Even original spare parts may be installed only by authorized service personnel.

In case the equipment was opened by unauthorized personnel, no warranty regarding personal safety, measurement accuracy, conformity with applicable safety measures or any consequential damage is granted by the manufacturer.

Repair and Parts Replacement by Authorized Service Personnel

When the instrument is opened, voltage conducting parts may be exposed. The instrument must be disconnected from the measuring circuit before the performance of repairs or the replacement of parts. If repair of a live open instrument is required, it 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 device demonstrates visible damage,

• If the instrument no longer functions, or if malfunctioning occurs,

• After long periods of storage under unfavorable conditions, e.g. humidity, dust or extreme temperature (see “Ambient Conditions” on page 64).

GMC-I Messtechnik GmbH 9

Safety Warnings

1.1 Use for Intended Purpose

• The respective multimeter is a portable device which can be held in the hand during the performance of measurements.

• Only those types of measurements described in chapter 5 may be performed with the measuring instrument.

• The measuring instrument, including measurement cables and plug-on test probes, may only be utilized within the specified measuring category (see page 65 and the table on page 8 regarding significance).

• Overload limits may not be exceeded. See technical data on page 60 for overload values and overload limits.

• Measurements may only be performed under the specified ambient conditions. See page 64 regarding operating temperature range and relative humidity.

• The measuring instrument may only be used in accordance with the specified degree of protection (IP code) (see page 66).

1.2 Meanings of Danger Symbols

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

Warning concerning dangerous voltage at the measurement input: U > 15 V AC or U > 25 V DC

1.3 Meanings of Acoustic Warning Signals

Voltage warning: > 1000 V (intermittent acoustic signal)

Current warning: > 11 A (continuous acoustic signal)

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Safety Warnings

GMC-I Messtechnik GmbH 11

Operating Overview – Connections, Keys, Rotary Switch, Symbols

Chap. 3 

Chap. 6

Chap. 4.3

Chap. 3 Chap. 5

Chap. 7

Chap. 6



Chap. 3

ff.

Chap. 3

Chap. 4.1



Chap. 4.1.2

Max. 1000 V!

Chap. 4.1 

Chap. 4.4 

Chap. 6 

Chap. 3.1 

Chap. 1.2

2 Operating Overview – Connections, Keys, Rotary Switch, Symbols

1 Display (LCD) (see page 13 for significance of symbols) 2

MAN / AUTO

 Increase parameter values

shift key for manual/automatic measuring range selection

“Operating Mode” menu:

Selection of individual menu entries against

the direction of flow

ON / OFF | LIGHT

key for switching device and display illumination on and off

4 FUNC | ENTER multifunction key

“Operating Mode” menu: Acknowledge entry (ENTER)

ISO ON / OFF Insulation resistance measurement

Key for switching insulation resistance measurement on and off 5 Increase measuring range or move decimal point to the right (MAN function) 6

Rotary switch

for measuring functions (see page 14 for significance of symbols) 7 DAkkS calibration mark 8 Connector socket for ground / connected to ground 9 Connector socket for current measurement with automatic blocking

10 Connector socket for voltage, resistance, temperature, diode

capacitance measurement

with automatic blocking

11 DATA / MIN / MAX

Key for freezing, comparing, deleting the measured value, and for Min/Max function

 Decrease values

“Operating Mode” menu:

MEASURE | SETUP

Select individual menu entries in flow direction

Key for switching between measuring and menu functions

13 ZERO | ESC

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Key for zero balancing “Operating Mode” menu: Exit menu level and return to a higher level, exit

parameters entry function without saving

METRAHIT COIL

only – Function COIL:

UCOIL ON / OFF Interturn short-circuit measurement as long as

key is being pressed, see chapter 5.8. 14 Decrease measuring range or move decimal point to the left (MAN function) 15 Power pack connector jack 16 Infrared interface

and

Symbols used in the Digital Display

Battery full

Battery OK

Battery weak

Battery (almost) dead, U < 1.8 V

Data transmission to / 

from the multimeter is active

IR interface in standby mode (ready to receive starting commands)

Battery level indicator

Interface indicator

1 2910

15 16

765

1921

Operating Overview – Connections, Keys, Rotary Switch, Symbols

1 Battery level indicator 2 ON: continuous operation (automatic shutdown deactivated) 3 MAN: manual measuring range selection active 4 Digital display with decimal point and polarity display 5 max/min: Min/Max value storage 6 DATA: display memory, “freeze measured value” 7 STORE: memory mode active 8 ISO: insulation resistance measurement active / selected test voltage

9 1: x current clip factor (transformation ratio) 10 IR: infrared interface display 11 Scale for analog display 12 Pointer for analog display (bar graph – pointer)

triangle appears: indicates overranging 13 Diode measurement selected 14 Selected type of current 15 TRMS measurement 16 Pt100(0): selected platinum resistance thermometer with

automatic recognition of Pt100/Pt1000 17 Type K: temperature measurement with type K (NiCr-Ni) thermocouple 18 sec (seconds): unit of time 19 REL: relative measurement with reference to offset 20 Unit of measure 21 ZERO: zero balancing active 22 Duty Cycle Measurement

(this function only available with customer-specific variant)

23 Warning regarding dangerous voltage: U > 15 V AC or U > 25 V DC

24 Continuity test with acoustic signal active 25 h (hours): unit of time

GMC-I Messtechnik GmbH 13

Operating Overview – Connections, Keys, Rotary Switch, Symbols

1kHz

VDC+=

Symbols used for Rotary Switch positions

Switch

1M



ISO

COIL/M

V~ 0/5 V~ AC TRMS Alternating voltage, AC TRMS, full bandwidth

Hz (V) 1 Hz ~ AC Voltage frequency, full bandwidth

% 2%

V~ 3 V Fil ~ AC TRMS Voltage frequency, with low pass filter (1 kHz)

Hz (V)

V 0/2 V DC Direct voltage

V 1 V DC AC TRMS Pulsating voltage, TRMS ( )



Temp RT D 0 C Pt 100/1000 Temp TC 1 C Typ-K Temperature with thermoelement type K

A 0/2 A DC Direct current value

A 1 A DC AC TRMS Pulsating current amperage, AC DC TRMS

A~ 0/2 A~ AC TRMS Alternating current amperage, AC TRMS

Hz (A) 1 Hz ~ AC Current frequency

FUNC

Display Measuring Function

0/2 V DC AC TRMS Pulsating voltage, TRMS DC + AC, 15 Hz ... 500 Hz

@UISO

1UISO / kM Insulation resistance measurement



0 UCOIL [μs] Interturn short-circuit measurement with METRAHIT COIL

@UISO

only for detection of interference voltage!

Duty Cycle Measurement

with METRAHIT COIL

4 Hz Fil ~ AC Voltage frequency, with low pass filter (1 kHz)

0  (DC) resistance 0/2  Continuity test with acoustic signal

V DC Diode voltage where I is constant

Temperature with Pt 100 / Pt 1000 resistance thermometer

0nF, F Capacitance

Additional Function clip-on (by menu SET  CLIP 1:1/10/100/1000)

Clip-on AC (V): clip-on current sensor Clip-on Hz (V): clip-on current sensor

Clip-on DC (V): clip-on current sensor Clip-on DC + AC (V): clip-on current sensor

Clip-on AC (A): clip-on current transformer Clip-on Hz (A): clip-on current transformer

14 GMC-I Messtechnik GmbH

User Interface Symbols in the Following Chapters

5 V / 600 mA

Serial number

Registration number Date of calibraion (year – month)

German Accrediation Body GmbH – Calibration lab

XY123

2012-07

D-K-

15080-01-01

 ...  Scroll through main menu

 ...  Scroll through submenu

  Select decimal point

 Increase/decrease value

time Submenu/parameter (7-segment font)

1nFo Main menu (7-segment font, boldface)

Symbols on the Device

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

Ground

Operating Overview – Connections, Keys, Rotary Switch, Symbols

Position of the power pack adapter socket, see also chapter 3.1.

Fuse for current measuring ranges (see chapter 9.3)

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 under the search term WEEE (see also chapter 9.5).

Calibration mark (blue seal):

CAT II / III Measuring category II or I II device, see also

See also “Recalibration” on page 71.

“Measuring Categories and their Significance per IEC 61010-1” on page 8.

Continuous, doubled or reinforced insulation

Indicates EC conformity

▲

▼

GMC-I Messtechnik GmbH 15

Position of the infrared interface, window on the top of the instrument

Initial Start-Up – Setup

Attention!

Note

3 Initial Start-Up

3.1 Batteries

Be certain to refer to chapter 9.2 regarding correct battery installation!

Momentary battery voltage can be queried in the “Info” menu (see chapter 6.3).

Disconnect the instrument from the measuring circuit before opening the battery compartment lid in order to replace the batteries.

Operation with Power Pack (not included, see chapter 10.3)

Installed batteries are disconnected electronically if the NA X-TRA power pack is used, and need not be removed from the instrument. If rechargeable batteries are used, they must be recharged externally. If the external power supply is switched off, the device is switched to battery operation without interruption.

3.2 Activation

Switching the Instrument On Manually

➭ Press the ON / OFF | LIGHT key until the display appears.

Power-up is acknowledged with a brief acoustic signal. As long as the key is held depressed, all of the segments at the liquid crystal display (LCD) are illuminated. The LCD is depicted on page 13. The instrument is ready for use as soon as the key is released.

Display Illumination

After the instrument has been switched on, background illumination can be activated by briefly pressing the ON / OFF | LIGHT key. Illumination is switched back off by once again pressing the same key, or automatically after approximately 1 minute.

Switching the Instrument On with a PC

The multimeter is switched on after transmission of a data block from the PC, assuming the “irStb” parameter has been set to “ir on” (see chapter 6.4).

However, we recommend using the power saving mode: “ir off”.

Electrical discharge and high frequency interference may cause incorrect displays to appear, and may disable the measuring sequence. Disconnect the device from the measuring circuit. Switch the instrument off and back on again in order to reset. If the problem persists, briefly dislodge the battery from the connector contacts (see also chapter 9.2).

3.3 Setting the Operating Parameters

Setting Time and Date

See “t iME” and “dAtE” parameters in chapter 6.4.

Display Modes for the Digital Display

Selection can be made from two different display modes (see “0.d iSP” parameter in chapter 6.4).

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ON / OFF

LIGHT

FUNC

ENTER

ON / OFF

LIGHT

Auto-Range

88.8.8.8

Illumination On

800.00

ON / OFF

LIGHT

Illumination Off

800.00

ON / OFF

LIGHT

0ff

ON / OFF

LIGHT

long (1 s)

3.4 Switching the Instrument Off

Switching the Instrument Off Manually

➭ Press the ON / OFF | LIGHT key until 0FF appears at the display.

Shutdown is acknowledged with a brief acoustic signal.

Automatic Shutdown

The instrument is switched off automatically if the measured value remains unchanged for a long period of time (maximum measured value fluctuation of approximately 0.8% of the measuring range per minute or 1 C or 1 F per minute), and if none of the keys or the rotary switch have been activated before a selected period of time in minutes has elapsed (see “APoFF” parameter on page 53). Shutdown is acknowledged with a brief acoustic signal. Exceptions include: Transmission and memory mode operation, continuous operation and whenever a dangerous voltage is applied to the input (U > 15 V AC or U > 25 V DC).

Disabling Automatic Shutdown

The instrument can be set to continuous operation.

➭ Simultaneously press the

The “Continuous On” function is indicated at by means of the

ON display to the right of the battery symbol.

The “Continuous On (on)” setting can be cancelled by changing the respective parameter or by switching the instrument off manually. In this case the parameter will be reset to 10 min (see “APoFF” on page 56).

and keys to this end.

Initial Start-Up – Setup

GMC-I Messtechnik GmbH 17

Control Functions

4 Control Functions

4.1 Selecting Measuring Functions and Measuring Ranges

4.1.1 Automatic Range Selection

The multimeter is equipped with auto-ranging for all measuring functions, except for temperature measurement, and diode and continuity testing. Auto-ranging is active as soon as the instrument is switched on. The instrument automatically selects the measuring range which allows for highest possible resolution of the applied quantity. When the instrument is switched to frequency measurement, the previously selected voltage measuring range remains active.

AUTO-Range Function

The multimeter is switched automatically to the next higher range at (3099 d + 1 d 0310 d), and to the next lower range at (280 d - 1 d  2799 d).

With high resolution the multimeter is switched automatically to the next higher range at (30999 d + 1 d 03100 d), and to the next lower range at (2800 d - 1 d  27999 d).

4.1.2 Manual Measuring Range Selection

Auto-ranging can be deactivated and measuring ranges can be selected manually in accordance with the following table by pressing the MAN / AUTO button.

The desired measuring range can then be selected with the

 or

 key.

The instrument is automatically returned to range selection when the MAN / AUTO key is pressed, the rotary switch is activated or the instrument is switched off and back on again.

Overview: Auto-Ranging and Manual Range Selection

Function Display

MAN / AUTO

Range switching sequence for:

V: 300 mV* Hz: 300 Hz

:

300

 or 

MAN / AUTO

* Via manual measuring range selection only



300A 3 mA 30 mA 300 mA 3A  10A

A : See chapter 5.9.3 und chapter 5.9.4 F: 30 nF 300 nF 3F 30F 300F M



300 k

@ISO

Return to automatic measuring range selection —

Manual mode active:

utilized measuring range is fixed



3 V 30 V 300 V 1000 V



3 kHz 30 kHz 300 kHz (Hz(U)) 3 k



30 k



300 k



3 M



30 M



300 M

3 M



3000 M

30 M

MAN



MAN



The multimeter is held in the selected measuring range. If the range limit is exceeded, 0L appears at the display. You should then switch to the next higher measuring range with the help of the  key.

18 GMC-I Messtechnik GmbH

Control Functions

Note

4.1.3 Quick Measurements

Measurements performed using a suitable fixed measuring range are executed more quickly than those which utilize automatic range selection. Quick measurement is made possible with the following two functions:

• Manual measuring range selection, i.e. selection of the measuring range with the best resolution (see chapter 4.1.2)

•With the DATA function (see chapter 4.4). In this way, the appropriate measuring range is selected automatically after the first measurement and the second measurement is executed more quickly.

The selected measuring range remains active for the subsequent series of measurements with these two functions.

4.2 Zero Offset / Relative Measurements

Zero balancing or a reference value for relative measurements can be stored to memory depending upon deviation from the zero point:

Deviation from zero – with short-circuited measurement cables for V, , A – with open input for capacitance unit of measure: F

0 to 200 digits ZERO REL

> 200 to 1500 digits REL

Display

The relevant reference or correction value is deducted individually for the respective measuring function as an offset from all future measurements and remains in memory until deleted, or until the multimeter is switched off.

Zero balancing and reference value adjustment can be used for auto-ranging, as well as for manual measuring range selection.

Note: Zero balancing is not possibIe in switch position

M@UISO

Zero Balancing

➭ Plug the measuring cables into the instrument and connect the

free ends to each other, except for capacitance measurement in which case the ends of the cables are not connected to each other.

➭ Briefly press the ZERO | ESC key.

The instrument acknowledges zero balancing with an acoustic signal, and the “ZERO REL” symbol appears at the LCD. The value measured at the moment the key is pressed serves as a reference value.

➭ Zero balancing can be cleared by once again pressing the

ZERO | ESC key.

As a result of TRMS measurement, the multimeter displays a residual value of 1 to 10/35 digits with short-circuited measurement cables as the zero point for V AC / I AC or V(AC+DC) / I (AC+DC) measurements (non-linearity of the TRMS converter). This has no influence on specified accuracy above 1% of the measuring range (or 3% in the mV, V(AC+DC) ranges).

Setting the Reference Value

➭ Plug the measuring cables into the instrument and measure a

reference value (max. 1500 digits).

GMC-I Messtechnik GmbH 19

Control Functions

➭ Briefly press the ZERO | ESC key.

The instrument acknowledges storage of the reference value with an acoustic signal, and the “ZERO REL” or the “REL” symbol appears at the LCD. The value measured at the moment the key is pressed serves as a reference value.

➭ The reference value can be cleared by once again pressing the

ZERO | ESC key.

Notes Regarding Relative Measurement

• Relative measurement effects the digital display only. The analog display continues to read out the original measured value.

• In the case of relative measurement,  F or AC quantities may also appear as negative values.

4.3 Display (LCD)

4.3.1 Digital Display

4.3.2 Analog Display

Measured Value, Polarity

The analog display demonstrates the dynamic performance of a moving-coil mechanism. This display is especially advantageous for observing measured value fluctuation, and for balancing procedures.

Display mode Pointer: the current measured value is tracked in real-time.

The analog scale displays a negative range of 5 scale divisions for the measurement of zero-frequency quantities, allowing for precise observation of measured value fluctuation around zero. If the measured value exceeds the negative range of 5 scale divisions, polarity is reversed at the analog display.

Scaling of the analog scale is automatic. This is very helpful for manual measuring range selection.

Measured Value, Unit of Measure, Type of Current, Polarity

The measured value with decimal and plus or minus sign appears at the digital display. The selected unit of measure and current type are displayed as well. A minus sign appears to the left of the value during the measurement of zero-frequency quantities, if the

Overranging

Overranging in the positive range is displayed by means of the right triangle symbol.

plus pole of the measured quantity is applied to the “” input. The “0.d iSP” parameter can be used to determine whether lead- ing zeros will be appear or be suppressed at the measured value display (see chapter 6.4).

Refresh Rate

In the bar graph and pointer modes, the analog display is refreshed 40 times per second.

Overranging

If the upper range limit of 3100 digits is exceeded “0L” (overload) appears at the display. Exceptions: “0L” appears at the display as of 1000.0 V in the case of voltage measurement in the 1000 V range, as of 5.100 V for diode testing, and as of 11.00 A in the 10 A range.

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Note

V, A, Hz

t [s]

100%

10%

Activated

Reactivated

Save

3000 digits

of Measuring Range

F, %

Control Functions

4.4 Measured Value Storage: DATA (auto-hold / compare)

An individual measured value can be automatically “frozen” with the DATA function (auto-hold). This is useful, for example, when contacting the measuring points with the test probes requires your full attention. After the measuring signal has been applied and the measured value has settled in in accordance with the “condition” listed in the table below, the measured value is frozen at the digital display and an acoustic signal is generated. The test probes can now be removed from the measuring points, and the measured value can be read from the digital display. If the measuring signal falls below the value specified in the table, the function is reactivated for storage of the next value.

Measured Value Comparison (DATA Compare)

If the currently frozen value deviates from the first saved value by less than 100 digits, the acoustic signal is generated twice. If deviation is greater than 100 digits, only one brief acoustic signal is generated.

The DATA function has no effect on the analog display, at which the current measured value continues to appear.

DATA

Function

activate brief blinks once

save (stabilized measured

value)

reactivate

Press

DATA /

Min/Max

However, when the digital display is “frozen”, the decimal point is fixed as well (fixed measuring range, symbol: MAN). The selected measuring range should not be manually changed as long as the DATA function is active.

The DATA function is deactivated by pressing and holding the DATA/MIN/MAX key (approx. 1 second), when the measuring function is changed or when the instrument is switched off and back on again.

GMC-I Messtechnik GmbH 21

change to

Min/Max

exit long

Reactivation results from falling short of specified measured value limits.

Two acoustic signals are generated the first time a measured value is saved as a reference value. For subsequent data hold, two acoustic signals are only generated if the currently frozen value deviates from the than 100 digits.

Key: MV = measured value, R = measuring range

brief See table in chapter 4.4.2

Condition

Measuring

Function

V, A, F, Hz, %> 10%



V, A, F, Hz, %< 10%



Measuring

Signal

of R

0L

of R

= 0L

Response from Instrument

Display

Digital

is displayed

stored

is cleared is cleared

first

saved value by less

DATA

static

blinks

Acou-

stic

once

twice

Control Functions

Example

The voltage measuring range is set manually to 30 V. The first measured value is 5 V and is stored to memory because it is greater than 10% of the measuring range (= 3 V), and is thus reliable above the background noise level. As soon as the measured values drops to less than 10% of the measuring range, i.e. amounts to less than 3 V which corresponds to removal of the test probes from the measuring point, the instrument is ready to store a new value.

4.4.1 Function DATA during insulation measurement *

This DATA function differs from the standard DATA-Compare function.

In the interference voltage measurement function V(ac+dc)1M the special DATA function for insulation measurement is activated by pressing the DATA key – DATA blinks in the display. During inter- ference voltage measurement, no DATA values are determined or stored yet. By briefly pressing the FUNC | ENTER key, the insulation measurement is activated and the test voltage is applied. An intermittent acoustic signal indicates to the user that the test voltage is applied (accompanied by a blinking of the ISO symbol in the display). After applying the test probes, a check is being made as to whether a valid measured value is present. As soon as a stable measured value appears in the display, the DATA value is stored (frozen in the display). A long acoustic signal indicates that the measurement is completed, the test voltage is switched off again, DATA no longer blinks and the user can read and note down the measured value. By repeatedly pressing the FUNC | ENTER key, the test voltage is applied again and DATA is activated (DATA blinks in the display).

If no DATA value is determined or if OL is shown in the display, the test voltage is automatically switched off after approx. 10 seconds. In order to deactivate the DATA function, the FUNC | ENTER key must be pressed and held.

* This function is especially available for variant METRAHIT ISO AERO,

for other variants as from firmware version 1.18.

22 GMC-I Messtechnik GmbH

4.4.2 Saving Minimum and Maximum Values – MIN/MAX Function

Note

Minimum and maximum measured values applied to the measuring instrument’s input after the Min/Max function has been activated can be “frozen” at the display. The most important use of this function is the determination of minimum and maximum values during long-term measured value observation.

The Min/Max function can be activated in all measuring functions. The Min/Max function has no effect on the analog display, at

which the current measured value continues to appear. Apply the measured quantity to the instrument and set the

measuring range with the MAN / AUTO key before activating the Min/Max function.

The Min/Max function is deactivated by pressing and holding the DATA/MIN/MAX key (approx. 1 second), when the measuring function is changed or when the instrument is switched off and back on again.

As opposed to the DATA function, the Min/Max function can also be used for temperature measurement.

Function Min/Max

activate

and save

save and

display

return to 1

stop long are deleted

Press

DATA /

Min/Max

2 x brief are saved

brief

Min. and Max.

Measured Values

storage continues

in background,

new min. and max.

values are displayed.

same as 1,

stored values are not

deleted

Control Functions

Response from Instrument

Display

Measured

Valu e

Digital

current

measured

value

saved min.

value

saved max.

value

same as 1

current

measured

value

Max. Min.

max and min

min.

max.

same

as 1

deleted

Acous-

Signal

tic

twice

once

twice

GMC-I Messtechnik GmbH 23

Control Functions

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

4.5 Measurement Data Recording

The multimeter is capable of recording measurement data using an adjustable sampling rate for long periods of time in the form of measurement series. Data are stored to a battery-backed memory module, and are retained even after the multimeter is switched off. The system acquires measured values relative to real-time.

Stored measured values can subsequently be read out with the help of METRAwin 10 software. The only prerequisite is a PC which is connected by means of an interface cable to the USB X-TRA bidirectional interface adapter, which is plugged onto a multimeter. See also chapter 7, “Interface Operation”.

Memory Parameters Overview

Parameter Page: Header

CLEAr EMpty 0CCUP rAtE StArt StoP

25: Clear Memory 25: Clear Memory – appears after CLEAr

25: Querying Memory Occupancy

55: rAtE – set the sampling rate

24: Starting Recording via Menu Functions

25: Ending Recording

The STORE Menu Function

➭ First set the sampling rate for memory mode operation (see

chapter 6.4 the rAtE parameter) , and then start memory mode operation.

➭ First select the desired measuring function and an appropriate

measuring range.

➭ Check the battery charge level before starting long-term

measurement recordings (see chapter 6.3). Connect the NA X-TRA power pack if required.

Starting Recording via Menu Functions

➭ Switch to the “SETUP ” mode by pressing MEASURE | SETUP, and

select the “StorE ” menu.

 ...  StorE 000.0 %  StArt

1nFo

➭ Memory mode operation is started by activating FUNC | ENTER.

STORE appears underneath the analog display and indicates

that the memory mode has been activated. “StoP ” appears at the digital display.

➭ Press MEASURE | SETUP in order to return to the measuring

function.

24 GMC-I Messtechnik GmbH

Control Functions

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

During Recording

STORE is displayed underneath the analog display during memory

mode operation, and

StoP

 000.3%

memory occupancy

can be monitored:

The following message appears as soon as memory is full: “100.0%”.

In order to be able to observe measured values during recording, switch to the measuring function by pressing MEASURE | SETUP. The display is returned to the memory menu after once again pressing MEASURE | SETUP.

A new memory block is created when another measuring function is selected with the rotary switch or the FUNC | ENTER key. Data storage then continues automatically.

Ending Recording

➭ “StoP” appears at the display after pressing MEASURE | SETUP.

StoP start

➭ Acknowledge the “StoP ” display by pressing FUNC | ENTER.

STORE is cleared from the display indicating that recording has

been ended.

➭ Press MEASURE | SETUP in order to return to the measuring

function.

➭ Memory mode operation can also be exited by switching the

multimeter off.

Querying Memory Occupancy

Memory occupancy can be queried during recording with the help of the “1nFo ” menu (see also chapter 6.3).

Memory occupancy range: 000.1% to 099.9%.

1nFo



bAtt: 

... 

0CCUP

017.4

Memory occupancy can be queried before recording is started via the “StorE ” menu.

 ...  StorE 017.4 %  StArt

1nFo

Clear Memory

This function deletes all measured values from memory! This function cannot be executed during memory mode

operation.

 ...  StorE 017.4 %  StArt

1nFo

 CLEAr empty

GMC-I Messtechnik GmbH 25

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

@UISO

, A/Hz

5 Measurements

5.1 Voltage Measurement

Notes Regarding Voltage Measurement

• The multimeter may only be operated with installed batteries. Dangerous voltages are otherwise not indicated, and the instrument may be damaged.

• The multimeter may only be operated by persons who are capable of recognizing contact hazards and taking the appropriate safety precautions. Contact hazards exist anywhere, where voltages of greater than 33 V RMS may occur. The test probes may only be only gripped up to the finger

Do not touch the metallic test probes under any

guard. circumstances.

• Avoid working alone when taking measurements which involve contact hazards. Be certain that a second person is present.

• Maximum allowable voltage between terminals 9 or 10 and ground (8) is 1000 V for measuring category I I, and 600 V for measuring category III.

• Be prepared for the occurrence of unexpected voltages at devices under test (e.g. defective devices). For example, capacitors may be dangerously charged.

• 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.

• Be aware of the fact that dangerous voltage spikes are not displayed during measurement with the low-pass filter. We recommend measuring voltage without the low-pass filter first, in order to be able to detect any dangerous voltages.

• Be absolutely certain that the measuring ranges are not overloaded beyond their allowable capacities. Limit values are included in chapter 8, “Technical Data”, in the table entitled “Measuring Functions and Measuring Ranges” in the “Overload Capacity” column.

•

Rotary selector switch position “V1M

/ M

@UISO

” is available for the detection of interference voltage during insulation resistance measurement. Use switch position V , V or V in order to perform precise voltage measurements.

26 GMC-I Messtechnik GmbH

5.1.1 Direct and Pulsating Voltage Measurement, V DC and V (DC+AC)

Note

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM mA A

Tem p

 MISO

– (+)

+ (–)

V= : 100 V1000 V

020.00

TRMS

020.00

> 15 V AC or > 25 V DC:

> 1000 V:

Warnings regarding dangerous voltage:

Max. 1000 V, 3 kHz

V: 10 mV1000 V

Hz: 1Hz  300 kHz

max

= 3 x 106 V x Hz

Measuring Ranges:

230.0

FUNC

ENTER

MEASURE

SETUP

...  SET ...  CL IP

FUNC

ENTER

FUNC

ENTER

 0ff

5 ranges: 300 mV, 3 V, 30 V,

300 V and 1000 V

➭ Set the CL iP parameter to 0FF in the current clip setup menu.

Otherwise all measured values are displayed in amperes, corrected by the amount resulting from the selected transformation ratio for an interconnected clip-on current sensor.

 ...  SET rAtE  ...  CL IP

1nFo

1 / 10/100/1000 / 0ff

➭ In accordance with the voltage to be measured, turn the rotary

switch to V or V .

➭ Connect the measurement cables as shown.

The “” connector jack should be grounded.

An intermittent acoustic signal warns the operator if the measured value exceeds the upper range limit in the 1000 V range.

Make sure that a current measuring range (“A”) has not been activated when the multimeter is connected for voltage measurement! If the fuse’s blowing limits are exceeded as a result of operator error, both the operator and the instrument are in danger!

With the rotary switch in the V position, the multimeter is always in the 1 V measuring range immediately after it is switched on. As soon a the MAN / AUTO key is pressed, and assuming the measured value is less than 280 mV, the multimeter is switched to the mV measuring range.



Measurements: V/Hz, , , Temp (°C/°F), , M

@UISO

, A/Hz

GMC-I Messtechnik GmbH 27

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

Attention!

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

@UISO

, A/Hz

5.1.2 Alternating Voltage and Frequency Measurement V AC and Hz with Selectable Low-Pass Filter

➭ Set the CL iP parameter to 0FF in the current clip setup menu.

Otherwise all measured values are displayed in amperes, corrected by the amount resulting from the selected transformation ratio for an interconnected clip-on current sensor.

1nFo  ...  SET rAtE  ...  CL IP

1 / 10/100/1000 / 0ff

➭ In accordance with the voltage or frequency to be measured,

turn the rotary switch to V~ or Hz/%.

➭ Connect the measurement cables as shown.

The “” connector jack should be grounded.

Frequency Measurement

➭ Connect the measured quantity in the same way as for voltage

measurement.

➭ Manually select the measuring range for the voltage amplitude.

When the instrument is switched to frequency measurement, the previously selected voltage measuring range remains active.

➭ You can switch back and forth between frequency

measurement with and without low-pass filter. Repeatedly press the FUNC | ENTER multifunction key, until the Hz or Hz/Fil unit of measure appears at the display. Lowest measurable frequencies and maximum allowable voltages are included in chapter 8, “Technical Data”.

Measurement with Low-Pass Filter

Voltage Measurement

Be aware of the fact that dangerous voltage spikes are not

An intermittent acoustic signal warns the operator if the measured value exceeds the upper range limit in the 1000 V range.

Make sure that a current measuring range (“A”) has not been activated, when the multimeter is connected for voltage measurement! If the fuse’s blowing limits are exceeded as a result of operator error, both the operator and the instrument are in danger!

➭ You can switch back and forth between voltage measurement

with and without low-pass filter.

➭ Repeatedly press the FUNC | ENTER multifunction key, until the V

displayed during this type of measurement (see also “Voltage Comparator”. We recommend measuring voltage without the low-pass filter first, in order to be able to detect any dangerous voltages.

A 1 kHz/-3 dB low-pass filter can be activated if required, in order to filter out capacitively induced high frequency pulses of greater than 1 kHz, for example when performing measurements at cables, i.e. undesired voltages of greater than 1 kHz can be suppressed.

“Fil” appears at the display in order to indicate the respectively activated low-pass filter. The multimeter is automatically switched to manual measuring range selection.

or V/Fil unit of measure appears at the display.

28 GMC-I Messtechnik GmbH

Specified measuring accuracy is not reached with signals of

COM mA A

Tem p

 MISO

Max. 1000 V, 3 kHz

V~: 10 mV  1000 V

Hz: 1Hz  300 kHz

max

= 3 x 106 V x Hz

Measuring Ranges:

> 15 V AC or > 25 V DC:

> 1000 V:

Warnings regarding dangerous voltage:

230.0

5 ranges: 300 mV, 3 V, 30 V,

300 V and 1000 V

0230.6

AC TRMS

0050.3

Hz / %

0229.9

AC TRMS

Fil

V~ with Filter

1 kHz

0050.0

Fil

Hz with Filter

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

1 kHz

MEASURE

SETUP

...  SET ...  CL IP

FUNC

ENTER

FUNC

ENTER

 0ff

Hz: vpm 0FF RPM: vpm 0FF

The following function is only available with customer-specific variants.

greater than 500 Hz when the filter is active.

Measurements: V/Hz, , , Temp (°C/°F), , M

@UISO

, A/Hz

Voltage Comparator for Displaying Dangerous Voltage

The input signal or measuring signal is checked by a voltage comparator for dangerous spikes, because these do not appear at the display when the low-pass filter is used. At voltages of greater than 15 V AC or 25 V DC, a danger symbol appears at the display: .

GMC-I Messtechnik GmbH 29

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

Duty cycle (%) =

Pulse duration (t

)

Pulse period (t

)

 100

COM mA A

Tem p

 MISO

1232.3

0002.0

tE/t

Pulse Time Quantities

pulse frequency = 1/tP

pulse duration

pulse period

– tEinterpulse period

E/tP

pulse or duty cycle

FUNC

ENTER

Measuring Ranges:

Hz tE/t

15 Hz ... 1 kHz 5 ... 95% 1 kHz ... 4 kHz 10 ... 90%

Duty Cycle Measurement (Function not available for METRAHIT ISO)

➭ Set the rotary switch to V~.

➭ Repeatedly press the FUNC | ENTER multifunction key until %

appears at the display.

➭ Connect the measurement cables as shown.

Make sure that a current measuring range (“A”) has not been activated, when the multimeter is connected for frequency or duty cycle measurement!

The ratio of pulse duration to pulse period is measured with periodic square-wave signals and displayed as a percentage.

@UISO

, A/Hz

The applied frequency must remain constant during duty cycle measurement.

30 GMC-I Messtechnik GmbH

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

RPM

Revolutions

min

----------------------------

Pulses

Revolution

-------------------------§





60s

--------

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

@UISO

, A/Hz

RPM Measurement (function only available with customer-specific variant)

Revolutions per minute (also known as rotational frequency) are measured by acquiring pulses. As a prerequisite for this measurement, the number of measurable pulses per revolution must first be set in the RPM setup menu (vpm 0FF, see below).

➭ Set the rotary switch to V~.

➭ Repeatedly press the FUNC | ENTER multifunction key until RPM

is briefly displayed. The measured value then appears in RPM, for example “244.3 r”.

Measured value RPM = revolutions per minute. Parameter vpm = pulses per revolution.

Pulses per Revolution Setup Menu

 ...  SET rAtE  ...  vpm

1nFo

0ff/1 : 0.1 ... 1000  

5.2 Resistance Measurement, 

➭ Disconnect supply power from the electrical circuit of the

device to be measured, and discharge all high-voltage capacitors.

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

Interference voltages distort measurement results! Refer to section 5.1.1 regarding testing for the absence of voltage with the help of the direct voltage measurement.

➭ Set the rotary switch to “”.

➭ Connect the device under test as shown.

Use short or shielded measurement cables in the case of high-impedance resistance.

Improving Accuracy by means of Zero Balancing

Cable resistance and contact resistance can be eliminated in all measuring ranges by means of zero balancing (see section 4.2).

GMC-I Messtechnik GmbH 31

Measurements: V/Hz, , , Temp (°C/°F), , M

COM mA A

Tem p

 MISO

0V !

0000.0



6 ranges: 300 3k30k, 300k, 3Mand 30 M

Measuring ranges: 0.1 k to 31 M



@UISO

, A/Hz

32 GMC-I Messtechnik GmbH

Measurements: V/Hz, , , Temp (°C/°F), , M

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

@UISO

, A/Hz

5.3 Temperature Measurement: Temp RTD and Temp TC

Temperature measurement is performed with a Pt100 or Pt1000 resistance thermometer, or a type K thermocouple (accessory, not included), which is connected to the voltage input.

Selecting the Unit of Measure for Temperature

1nFo

 ...  tEMP °C / °F 

(°C = default setting)

5.3.1 Measurement with Resistance Thermometers

➭ Set the rotary switch to “Temp

RTD

”.

Press the FUNC | ENTER key in order to change to the other measuring function if required.

The sensor type, i.e. Pt100 or Pt1000, is detected automatically and displayed.

There are two different ways to compensate for cable resistance:

Automatic Compensation

➭ Acknowledge by pressing the ZERO | ESC key.

“Short leads” appears at the display.

If you prefer to enter cable resistance directly, you can skip the following entry prompt.

➭ Short circuit the measuring instrument’s connector cables.

“000.0” appears at the display. After pressing the FUNC | ENTER key, automatic compensation of cable resistance is activated for all subsequent measurements. The short-circuit can now be eliminated, and the device is ready for use.

Enter Cable Resistance

➭ Press the ZERO | ESC key once again in the automatic

compensation menu.

➭ Enter the known resistance of the connector cables with the

scroll keys: Select the digit to be changed with the

 keys, and change

the respectively selected digit with the keys. The default value is 0.43 . Values can be selected within a range of 0 to 50 .

➭ Upon pressing the FUNC | ENTER key, the selected value is acti-

vated and the display is returned to the measuring function. Cable resistance remains in memory even after the instrument has been switched off.

GMC-I Messtechnik GmbH 33

Measurements: V/Hz, , , Temp (°C/°F), , M

COM mA A

Tem p

 MISO

0025.6



Pt1000

RTD

0000.0



Short Leads

r000.5



Enter Cable Resistance

Automatic

RTD

Compensation

Measuring Ranges

RTD

Pt100

–200.0+850.0 C

RTD

Pt1000

–150.0+850.0 C

FUNC

ENTER

ZERO

ESC

ZERO

ESC

FUNC

ENTER

Te mp

RTD

Tem p

@UISO

, A/Hz

34 GMC-I Messtechnik GmbH

Note

COM mA A

Tem p

 MISO

Te mp

RTD

0023.3



Tem p

Typ e K

TE (TC)

0256.0



Pt1000

RTD

Measuring Range

TE (TC)

K (NiCr-Ni)

–250.0  +1372.0 C

FUNC

ENTER

5.3.2 Measurement with Thermocouples, Temp TC

RTD

”.

➭ Set the rotary switch to “Temp

The last selected temperature measurement or the last selected temperature sensor, i.e. type K or Pt100/Pt1000, remains in memory and is accordingly displayed. Press the FUNC | ENTER key in order to change to the other measuring function if required.

➭ The reference temperature is measured at the internal

reference junction (see parameter “1tEMP” in Seite 54 regarding querying).

The internal reference temperature (temperature of the internal reference junction) is measured by a temperature sensor inside of the instrument. This may be somewhat above room temperature as a result of internal heat-up, or moving from warmer to colder surroundings or vice versa.

➭ Connect the sensor to the two accessible jacks. The

instrument displays the measured temperature using the selected unit of measure.

Measurements: V/Hz, , , Temp (°C/°F), , M

@UISO

, A/Hz

GMC-I Messtechnik GmbH 35

Measurements: V/Hz, , , Temp (°C/°F), , M

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM mA A

Tem p

 MISO

0V !

0.443

R < 1, 10, 20, 30, 40, 90 

FUNC

ENTER

R: 300

Measuring Range:

000.8



(0.1  to 310 )

5.4 Continuity Test

➭ Disconnect supply power from the electrical circuit of the de-

vice to be measured, and discharge all high-voltage capacitors.

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

Interference voltages distort measurement results!

➭ Set the rotary switch to “ ”.

➭ A loudspeaker symbol appears at the display.

➭ Connect the conductor path under test as shown.

Depending upon the selected limit value, the multimeter generates a continuous acoustic signal in the case of continuity or short-circuiting, i.e. at a value of less than the selected limit value.

“0L” appears at the display in the case of an open connection. The limit value can be adjusted in the “SET ” menu (see also sec-

tion 6.4):

@UISO

, A/Hz

1nFo  ...  SET rAtE  ...  bEEP

1, 10, 20, 30, 40, 90 

(10 = default setting)

36 GMC-I Messtechnik GmbH



5.5 Diode Testing with Constant Current of 1 mA

Note

COM mA A

Tem p

 MISO

Forward Direction Reverse Direction

0V !

0.L

to 5.100 V

Measuring Range:

–

0.443

000.8



FUNC

ENTER

➭ Disconnect supply power from the electrical circuit of the

device to be measured, and discharge all high-voltage capacitors.

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

Interference voltages distort measurement results! Refer to section 5.1.1 regarding testing for the absence of voltage with the help of the direct voltage measurement.

➭ Set the rotary switch to “ ”.

➭ Press the FUNC | ENTER key and the diode symbol appears at

the display.

➭ Connect the device under test as shown.

Conducting Direction and Short-Circuit

The instrument displays forward voltage in volts (display: 4 places). As long as voltage drop does not exceed the maximum display value of 5.1 V, several series connected components or reference diodes with small reference voltages, as well as Z-diodes and LEDs, can be tested.

Reverse Direction and Interruption

The measuring instrument indicates overload 0L.

Measurements: V/Hz, , , Temp (°C/°F), , M

@UISO

, A/Hz

Resistors and semiconductor paths connected in parallel to the diode distort measurement results!

GMC-I Messtechnik GmbH 37

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

COM mA A

Tem p

 MISO

COM mA A

Tem p

 MISO

0V !

10.38

–



Measuring range: 10 pF to 300 F 5 ranges: 30 nF, 300 nF,

3 F, 30 F and 300 F

5.6 Capacitance Measurement

➭

Disconnect supply power from the electrical circuit of the device to be measured, and discharge all high-voltage capacitors.

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

Capacitors must always be discharged before measurement is performed. Interference voltages distort measurement results! Refer to section 5.1.1 regarding testing for the absence of voltage with the help of the direct voltage measurement.

➭ Set the rotary switch to “ ”.

➭ Connect the (discharged!) device under test to the sockets

with the measurement cables as shown.

The “–” pole of polarized capacitors must be connected to the “” jack. Resistors and semiconductor paths connected in parallel to the capacitor distort measurement results!

@UISO

, A/Hz

38 GMC-I Messtechnik GmbH

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

COM mA A

Tem p

 MISO

00.00



Short circuit the measurement cables.

0V !



M

@UISO

Interference Voltage Detection

000.0

TRMS

1M

ISO 500 V

@UISO

, A/Hz

5.7 Insulation Resistance Measurement – M

5.7.1 Preparing for Measurement

Testing the Measurement Cables

The test probes at the ends of the measurement cables should be short circuited before performing insulation resistance measurements with the selector switch in the  or the position, in order to make sure that a value close to 0  is displayed at the instrument. Incorrect connection or a broken measurement cable can be detected in this way.

@UISO

Insulation resistance may only be measured at voltage-free devices. The measurement cables may not come into contact with one another during high-resistance insulation measurements.



➭ Set the rotary switch to “

➭ Connect the measurement cables to the two accessible jacks.

➭ Interference voltage measurement (V AC+DC TRMS) is

conducted in this switch position.

The FUNC | ENTER key for U order to start the insulation resistance measurement if the device under test is voltage-free.

ISO ON / OFF may only be pressed in

@UISO

”.

GMC-I Messtechnik GmbH 39

The M tion resistance measurement and interturn short-circuit detection (METRAHIT COIL). However, if interference voltage is inadvertently applied with the switch in this position, it appears at the display. If an interference voltage of  50 V is present, insulation resistance measurement is disabled. The LCD continues to display the interference voltage value. If a voltage of greater than 1000 V is present, an acoustic signal is generated as well.

switch position may only be used for insula-

@UISO

Measurements: V/Hz, , , Temp (°C/°F), , M

Caution: High-Voltage!

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MAN / AUTO

DATA/MIN/MAX

... 500 V10 V ...

M

@UISO



Autorange

002.00



M

ISO

FUNC

ENTER

UISO ON / OFF

000.0

Activate

Test Vol t a g e

TRMS

500 V

ISO 500 V

M

@UISO

1M

@UISO

, A/Hz

The selected test voltage appears at the display during testing.

Do not touch the conductive ends of the test probes

instrument has been activated for the measurement of insulation resistance.

You may otherwise be exposed to a current of

2.5 mA (limited in the measuring instrument), and although this is not life endangering, the resulting electrical shock is quite discernible. If, on the other hand, measurement is being performed on a capacitive device under test, for

when the

5.7.2 Performing the Insulation Measurement

➭ Starting the insulation resistance measurement:

Press and hold the U

ISO ON / OFF key until the display settles in,

in order to measure insulation resistance. Insulation resistance measurement is ended by releasing the key.

example a cable, it may be charged with up to approximately 1200 V. Touching the device under test after measure-

ment has been performed is life endangering in this case!

Selecting the Test Voltage (U

= 50 to 1000 V*)

ISO

The desired test voltage can be selected in the “SET” menu (see also section 6.4):

1nFo  ...  SET rAtE  ...  v1so

... 500, 1000 V* 

* Selectable test voltages and the default value depend upon the

respective device variant.

Alternatively, the requested test voltage can be selected via the cursor keys

1M

 . Prerequisite: the multimeter is in switch position

and in the AUTO range function.

40 GMC-I Messtechnik GmbH

Auto-ranging is active during insulation resistance measurement.

For the automatic freezing of valid measured values, a DATA function specially geared to insulation measurement can be activated, see section 4.4.1.

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

Attention!

Note

–

0V !

Discharge

025.0

UISO

TRMS

ISO 500 V

@UISO

, A/Hz

Automatic Recognition of Interference Voltage

5.7.3 Ending the Measurement and Discharging

during Insulation Resistance Measurement

If the instrument detects interference voltage of greater than 15 V AC or > 25 V DC during insulation testing (condition: U

, e.g. Riq < 100 k at 100 V, see Seite 62, footnote 1), Error

 U

ISO

interference

is briefly displayed at the LCD. The instrument is then automatically switched to voltage measurement, and the currently measured voltage value is displayed.

➭ Briefly press the U

ISO ON / OFF key.

After measurement has been completed, any remaining residual

A dead zone results in erroneous measurements for automatic interference voltage detection during insulation resistance measurement. The dead zone lies within a range of 80% to 120% of the selected test voltage (in the case of an interference voltage whose value is equal to that of measuring voltage, the two voltages neutralize each other).

voltage is displayed which may result from cable capacitance. The instrument’s internal 1 M resistor causes rapid discharging. However, contact to the device under test must be maintained. The falling voltage value can be observed directly at the LCD.

Do not disconnect the device under test until the voltage value has dropped to < 25 V!

Manual switching to insulation resistance measurement is disabled for as long as voltage is applied to the test terminals.

If interference voltage is no longer present, the M

@ISO

measure-

ment can be started by once again pressing the UISO ON / OFF key.

The instrument’s batteries are rapidly depleted during insulation resistance measurement. Deactivate insulation resistance measurement between measurements for this reason. Use only alkaline manganese batteries in accordance with IEC 6 LR61.

If Error appears at the display, the cable (the device under test) is most likely capacitively charged to a significant extent. Remedy: Short circuit the cable (the device under test). Repeat the measurement.

Rotary selector switch position “V1M

/ M able for the detection of interference voltage during insulation resistance measurement.

Special case indication of low insulation resistances up to short circuit

First „Error“ is displayed, and then briefly „Short“, followed by the current resistance measured value.

GMC-I Messtechnik GmbH 41

Use switch position V , V or V in order to perform precise voltage measurements.

@UISO

” is avail-

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

COM mA A

Tem p

 MISO

0V !

M

@UISO



COIL

Example

COIL

METRAHITCOIL

COIL

TEST ADAPTER

Star Connection

Connect COIL TEST ADAPTER and Measuring Cables

UISO

1200 V !

> 500 A !

(Pulse)

M

@UISO

Interference Voltage Detection

000.0

TRMS



1000V

COIL

@UISO

, A/Hz

5.8 Interturn Short-circuit Measurement – Function

This function can only be performed with the METRAHIT COIL device variant and only in combination with the COIL TEST ADAPTER. With this measurement, a partially periodic time value is determined in proportion to the inductivity of the respective winding for each motor coil or coil combination via a cyclical discharge at high voltage. A comparison of the measurement results allows for examining the symmetry of the motor coils and the detection of a potential interturn short-circuit as a result.

5.8.1 Preparing the Measurement

COIL/M



@UISO

Interturn short-circuit measurements may only performed on voltage-free windings.

➭ Connect the

COIL TEST ADAPTER

with the two enabled jacks of the multimeter via the contact-protected plugs at the adapter connection cables: the red cable with the COIL jack and the black cable with the COM jack.

COIL/M



➭ Set the rotary switch at „

@UISO

“.

➭ Connect the two measurement cables with the two jacks of

the

COIL TEST ADAPTER (marked with a motor symbol).

➭ Establish contact between the inductive DUT and the (alligator)

clips applied to the test probes. In the case of 3-phase current motors, for example, contact the winding connections U–V, V– W und U–W successively.

➭ An interference voltage measurement V AC+DC TRMS is con-

ducted in this switch position.

Only if the DUT is voltage-free, are you allowed to press key U ON / OFF for interturn short-circuit measurement (and hold it until the measured value is stable).

42 GMC-I Messtechnik GmbH

COIL

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

Caution: High-Voltage!

Attention!

@UISO

, A/Hz

The switch position

COIL/M



may only be used for

@UISO

interturn short-circuit measurement. However, any interference voltage accidentally applied is indicated in this switch position. If an interference voltage of more than 50 V is present in the equipment, interturn short-circuit measurement is disabled. The LCD panel continues to display the interference voltage and the „Caution: High-Voltage“ symbol. If a voltage of more than 1000 V is applied, an additional acoustic signal is generated.

Do not touch the conductive ends of the test probes as long as the U

COIL ON / OFF key is being pressed.

A voltage of up to 1,200 Volt is present at the two enabled output jacks of the multimeter as well as, in the form of pulsed voltage, at the two output jacks of the

COIL TEST ADAPTER

(marked with a motor symbol). Multimeter: A 2.5 mA current (limited in the mesuring instrument) may flow through your body which, although it does not reach any life-threatening values, is perceptible nevertheless as a slight electric shock.

COIL TEST ADAPTER

: Pulsed current of more than 500 A may be present at the output jacks. The DUT may charge up: Wait after each mesurement until the voltage at the DUT has decreased (interference voltage indication). If not, touching the DUT may pose a danger to life!

Test voltage (U

= 1000 V)

ISO

The test voltage of the interturn short-circuit measurement has been fixed at 1000 V and cannot be changed. The display shows the momentary test voltage during measurement.

5.8.2 Performing Interturn Short-circuit Measurement

➭ Contact the winding in question (e.g. U–V) to check for ab-

sence of voltage.

Do not measure without support, but rather with a self-retaining contact, for example alligator clips. Poor contact may lead to flying sparks, and slipping off the DUT may be life-threatening!

➭ Activating interturn short-circuit measurement:

Press and hold the U

COIL ON / OFF key for measurement until the

display of the time value has stabilized. In the display, a test voltage of 1000 V blinks.

➭ Read off the numeric value (indicated in µsec) and note down

the value together with the contacted winding.

➭

Release the

COIL

ON / OFF

key to stop the measurement.

GMC-I Messtechnik GmbH 43

Measurements: V/Hz, , , Temp (°C/°F), , M

0120.0

ZERO

ESC

COIL ON

/ OFF

000.0

Apply Test Voltage

TRMS

M

@UISO



COIL

Note Winding & Measured Value

1000Vsec

1000V

035.0

U-V

V-W

U-W

035.0

. . .

1000Vsec



REL

1000Vsec



REL

1000Vsec



REL

➭ Allow the winding to be discharged via the multimeter before

removing the contact, see Kap. 5.8.3.

➭ Connect the next winding (e.g. V–W) and repeat the measuring

procedure as described above.

@UISO

, A/Hz

Signalling of Measuring Progress

For better guidance, the first three test steps are marked accordingly. On starting the first measurement, a (horizontal) segment left of the numeric field is shown. On starting the second measurement, two segments are shown. On starting the third measurement, three segments are shown. From the fourth measurement onwards, the three segments are shown intermittently.

44 GMC-I Messtechnik GmbH

Measurements: V/Hz, , , Temp (°C/°F), , M

Note

–

0V !

Discharge

025.0

ISO

TRMS

1000V

@UISO

, A/Hz

Automatic Evaluation of the Measuring Results

With the start of the second measurement, the automatic evaluation of the measuring results begins. The analog display* shows the maximum deviation in percent from all preceding measurements of the U

measurement series. This allows for a direct

COIL

comparison between the first and the subsequent measurements. By establishing a relation between the third measurement and the results of the preceding measurements, you automatically receive a concluding comparison of the 3 measurements.

Alternatively, you can measure at all 3 motor coils (star or delta connected), note down the values and compare them with each other for conclusion.

The admissible asymmetry depends on the motor type: A motor with short-circuit rotor will not display any major asymmetry (typically 1%), whereas a permanently excited motor may display a certain degree of asymmetry, depending on the rotor position. At a deviation of more than 10 %, however, there is definitely a fault in the DUT (e.g. interturn short-circuit).

If a measured value is equal to 0, there is a short-circuit. If there is no discharge, the measured coil is open.

In order to start a new measurement series, briefly press the

MEA-

SURE | SETUP key twice or switch to another function (via rotary

switch operation).

5.8.3 Ending the Measurement and Discharging

➭ Release the UCOIL ON / OFF key.

After measurement has been completed, any remaining residual voltage is displayed which may result from cable capacitance. The instrument’s internal 1 M resistor causes rapid discharging. The contact with the motor coils must be maintained. The falling voltage value can be observed directly at the LCD.

Do not disconnect the device under test until the voltage value has dropped to < 25 V!

Rotary selector switch position “V1M

/ M

@UISO

” is available for the detection of interference voltage prior to interturn short-circuit measurement. Use switch position V , V or V in order to perform precise voltage measurements.

* the deviation is presented as a bargraph in function COIL

(default setting), additionally REL is shown.

GMC-I Messtechnik GmbH 45

Measurements: V/Hz, , , Temp (°C/°F), , M

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

@UISO

, A/Hz

5.9 Current Measurement

Notes Regarding Current Measurement

• The multimeter may only be operated with installed batteries or rechargeable batteries. Dangerous currents are otherwise not indicated, and the instrument may be damaged.

• Set up the measuring circuit in a mechanically secure fashion, and secure it against inadvertent breaks. Select conductor cross-sections and lay out connections such that they do not overheat.

• An continuous acoustic signal warns of current greater than 11 A.

• If the fuse for the active current measuring range blows, “FUSE” appears at the digital display, and an acoustic signal is generated at the same time.

• If a fuse should blow, eliminate the cause of overload before placing the instrument back into service!

• Fuse replacement is described in section 9.3.

• Be absolutely certain that the measuring ranges are not overloaded beyond their allowable capacities. Limit values are included in chapter 8, “Technical Data” in the table entitled “Measuring Functions and Measuring Ranges” in the “Overload Capacity” column.

Direct Current Measurement – CLIP Parameter = OFF

➭ Set the CL iP parameter to 0FF in the current clip setup menu.

Otherwise all displayed measured values are corrected by the amount resulting from the selected transformation ratio for an interconnected clip-on current sensor.

 ...  SET rAtE  ...  CL IP

1nFo

1 / 10/100/1000 / 0ff

Switch

A 0/2 A DC

A 1 A DC AC TRMS

A~ 0/2 A~ AC TRMS AC (A) clip: clip-on current transformer

Hz (A) 1Hz ~ AC Hz (A) clip: clip-on current transformer

FUNC

Display Additional clip function (via CLIP 1:1/10/

100/1000 in the SET menu)

46 GMC-I Messtechnik GmbH

5.9.1 Direct and Pulsating Current Measurement, Direct Connection,

COM mA A

Tem p

 MISO

003.50

TRMS

A: 0.1 A . . . 11 A A: 10 A . . . 11 A 6 ranges: 300 A, 3 mA, 30 mA, 300 mA, 3 A and 10 A

88.8.8.8

I > 11 A

Current

Measuring Ranges:

Current measurement may only be performed with installed batteries!

FUNC

ENTER

MEASURE

SETUP

...  SET ...  CL IP

FUNC

ENTER

FUNC

ENTER

 0ff

A DC and A (DC+AC)

➭ First disconnect supply power from the measuring circuit or

the power consumer (1), and discharge any capacitors.

➭ In accordance with the current to be measured, set the rotary

switch to A or A

➭ Select the type of current appropriate for the measured

quantity by briefly pressing the FUNC | ENTER multifunction key. Each time the key is pressed, the instrument is switched back and forth between A DC and A (DC + AC) cated by means of an acoustic signal. The current type is indicated at the LCD by means of the DC or the (DC+AC) symbol.

➭ Safely connect the measuring instrument (without contact

resistance) in series to the power consumer (2) as shown.

➭ Switch supply power to the measuring circuit back on (3).

➭ Read the display. Make a note of the measured value if the

instrument is not being operated in the memory mode or the transmission mode.

➭ Disconnect supply power from the measuring circuit or the

power consumer (1) once again, and discharge any capacitors.

➭ Remove the test probes from the measuring point and return

the measuring circuit to its normal condition.

, which is indi-

TRMS

Measurements: V/Hz, , , Temp (°C/°F), , M

@UISO

, A/Hz

GMC-I Messtechnik GmbH 47

Measurements: V/Hz, , , Temp (°C/°F), , M

COM mA A

Tem p

 MISO

003.50

TRMS

0050.1

88.8.8.8

I > 11 A

Current measurement may only be performed with installed batteries!

Current

FUNC

ENTER

Measuring Ranges:

Hz: 1 Hz . . . 31 kHz

A ~: 10 A . . . 11 A 6 ranges: 300 A, 3 mA, 30 mA, 300 mA, 3 A and 10 A

3 ranges: 300 Hz, 3 kHz and 30 kHz

MEASURE

SETUP

...  SET ...  CL IP

FUNC

ENTER

FUNC

ENTER

 0ff

5.9.2 Alternating Current and Frequency Measurement,

Direct Connection, A AC and Hz

➭ First disconnect supply power from the measuring circuit or

the power consumer (1), and discharge any capacitors.

➭ In accordance with the current or frequency to be measured,

turn the rotary switch to A~ or Hz.

➭ Select the desired measured quantity by briefly pressing the

FUNC | ENTER multifunction key. Each time the key is pressed, AC

TRMS

switching is acknowledged with an acoustic signal.

➭ Safely connect the measuring instrument (without contact

resistance) in series to the power consumer as shown.

➭ Switch supply power to the measuring circuit back on (3).

➭ Read the display. Make a note of the measured value if the

instrument is not being operated in the memory mode or the transmission mode.

➭ Disconnect supply power from the measuring circuit or the

power consumer (1) once again, and discharge any capacitors.

➭ Remove the test probes from the measuring point and return

the measuring circuit to its normal condition.

and Hz are alternately selected, and

@UISO

, A/Hz

48 GMC-I Messtechnik GmbH

5.9.3 Direct and Pulsating Current Measurement

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM mA A

Tem p

 MISO

Current

0035.0

1:1000

0035.0

1:1000

TRMS

FUNC

ENTER

Ri ~ 9 M

MEASURE

SETUP

...  SET ...  CL IP

FUNC

ENTER

FUNC

ENTER

 0ff

Measuring Ranges:

mA / A: see table

with Clip-On Current Sensor A DC and A (DC+AC)

Transformer Output, Voltage/Current

When a clip-on current sensor is connected to the multimeter (V input), all current displays appear with the correct value in accordance with the selected transformation ratio. The only prerequisite is that the current sensor is equipped with at least one of the below listed transformation ratios, and that the ratio has been previously selected in the following menu (Cl ip 0FF).

Current Clip Setup Menu

Measurements: V/Hz, , , Temp (°C/°F), , M

@UISO

, A/Hz

 ...  SET rAtE  ...  CL IP

1nFo

0ff/1 / 10/100/1000

Tra n sf. R a t io

CL IP

1:1

1 mV / 1 mA

1:10

1m V / 10 mA

1:100

1m V / 100 mA

1:1000

1 mV/1 A

Maximum allowable operating voltage is equal to the current

Measuring Ranges Clip Type

300 mV 3 V 30 V

300.0 mA 3.000 A 30.00 A WZ12C

3.000 A 30.00 A 300.0 A

30.00 A 300.0 A 3,000 kA

300.0 A 3,000 kA 30.00 kA

transformer’s nominal voltage. additional error resulting from the clip-on current sensor must also be taken into consideration.

(default value: Cl ip = 0ff = voltage display)

GMC-I Messtechnik GmbH 49



When reading the measured value,

WZ12B, Z201A/B

Z202A/B METRAFLEX

Z202A/B, Z203A/B, WZ12C METRAFLEX

Measurements: V/Hz, , , Temp (°C/°F), , M

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM mA A

Tem p

 MISO

0035.0

TRMS

1:1000

0050.1

1:1000

FUNC

ENTER

Current

Ri ~ 9 M

Measuring Ranges:

Hz: 1 Hz . . . 31 kHz

MEASURE

SETUP

...  SET ...  CL IP

FUNC

ENTER

FUNC

ENTER

 0ff

mA / A: see table

3 ranges: 300 Hz, 3 kHz and 30 kHz

@UISO

, A/Hz

5.9.4 Alternating Current Measurement with Clip-On Current Sensor,

A AC and Hz

Transformer Output, Voltage/Current

Current Clip Setup Menu

1nFo

0ff/1 / 10/100/1000

Tra n sf. R a t io

CL IP

1 mV / 1 mA

1m V / 10 mA

1m V / 100 mA

Maximum allowable operating voltage is equal to the current

1:1

1:10

1:100

1:1000

1 mV/1 A

transformer’s nominal voltage. additional error resulting from the clip-on current sensor must also be taken into consideration.

(default value: Cl ip = 0ff = voltage display)

50 GMC-I Messtechnik GmbH

 ...  SET rAtE  ...  CL IP



WZ12B, Z201A/B

Z202A/B METRAFLEX

Z202A/B, Z203A/B, WZ12C METRAFLEX

Measuring Ranges Clip Type

300 mV 3 V 30 V

300.0 mA 3.000 A 30.00 A WZ12C

3.000 A 30.00 A 300.0 A

30.00 A 300.0 A 3,000 kA

300.0 A 3,000 kA 30.00 kA

When reading the measured value,

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM mA A

Tem p

 MISO

Current

Ri 50 

003.50

TRMS

0050.1

FUNC

ENTER

1:1000

MEASURE

SETUP

...  SET ...  CL IP

FUNC

ENTER

FUNC

ENTER

 0ff

Measuring Ranges:

Hz: 1 Hz . . . 31 kHz

mA / A: see table

3 ranges: 300 Hz, 3 kHz and 30 kHz

5.9.5 Alternating Current Measurement with A AC and Hz Clip-On Current Transformer

Current/Current Transformer Output

When a clip-on current transformer is connected to the multimeter (mA/A input), all current displays appear with the correct value in accordance with the selected transformation ratio. The only prerequisite is that the current transformer is equipped with at least one of the below listed transformation ratios, and that the ratio has been previously selected in the following menu (Cl ip 0FF).

Current Clip Setup Menu

 ...  SET rAtE  ...  CLIP

1nFo

1 / 10/100/1000 / 0ff

Tra n sf. R a t ios

CL IP

1:1

1mA / 1 mA

1:10

1 mA / 10 mA

1:100

1 mA / 100 mA

1:1000

1 mA / 1 A

DMM Measuring Ranges Clip Types

30 mA 300 mA 3 A

30.00 mA 300.0 mA 3.000 A

300 mA 3.000 A 30.00 A

3.000 A 30.00 A 300.0 A

30.00 A 300.0 A 3000.0 A



WZ12A, WZ12D, WZ11A, Z3511, Z3512, Z3514

Measurements: V/Hz, , , Temp (°C/°F), , M

@UISO

, A/Hz

GMC-I Messtechnik GmbH 51

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

6 Device and Measuring Parameters

The instrument’s “SETUP ” mode (menu mode) makes it possible to set operating and measuring parameters, query information and activate the interface.

➭ The menu mode is accessed by pressing the

MEASURE | SETUP key, assuming that the instrument is switched on and set to “Measure” (measuring mode operation). “1nFo ” appears at the display.

➭ The main menus, i.e. the “SET ” and “tEMP ” menus, as well as

the “SEnd” and “StorE ” menus, are accessed, and the display is returned to “InFo ”, by repeatedly activating the

  keys

(in any direction).

➭ After selecting the desired main menu, sub-menus are

accessed by pressing the FUNC | ENTER key.

➭ The desired parameter is selected by repeatedly pressing the

 keys.

➭ In order to check or change a parameter, acknowledge it with

the FUNC | ENTER key.

➭ The

  keys can be used to position the cursor at the entry

position. The desired value is selected with the help of the

➭ Changes can only be accepted with the FUNC | ENTER key.

➭ You can return to the sub-menu without making any changes

by pressing the ZERO | ESC key, and to the main menu by pressing the ZERO | ESC key once again etc.

➭ You can switch to the measuring mode from any menu level by

pressing the FUNC | ENTER key.

 keys.

After repeatedly pressing the MEASURE | SETUP key (without first turning the multimeter off), you can return to the last selected menu or parameter from the measuring mode.

Example: Setting Time

 ...  set rAte  ...  t iME

1nFo

10:24 (hh:mm)

 

Setting hours and minutes:

 

Advance to desired entry position.

 Change the setting, the entry position blinks.

Press and hold the key The new time setting is activated after

acknowledgement.

to change the setting rapidly.

52 GMC-I Messtechnik GmbH

6.1 Paths to the Various Parameters 6.2 List of All Parameters

bAtt

uers ion

1temp dAtE

t iME

0CCvP

1nFo

tEMPSEnd SET StorE

StArt StoP

000. 0 CLEAr StArt StoP

Sub-Menus / Parameters 

rAtE resol * 0

.d iSP

vpm * CL iP APoFF v_1so bEEP irStb Addr dAtE t iME

C F

Main Menus 

Query Set Set Set Set

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

01nfo

MEASURE

SETUP

020.00

TRMS

Selection

FUNC

ENTER

Selection

FUNC

ENTER

Selection

FUNC

ENTER

Selection

FUNC

ENTER

* Function only available with customer-specific variant

GMC-I Messtechnik GmbH 53

Device and Measuring Parameters

Parameter

0.d iSP 55: 0.diSP – show/hide leading zeros a.disp Addr APoFF bAtt bEEP CLEAr CL IP

dAtE EMpty 1nfo irStb itemp 0CCvP rAtE resol SEnd SET StArt StoP store tEMP t iME v1so vpm uErS ion

Page: Header

55: A.diSP – Select display mode for the analog display

59: Configuring Interface Parameters

56: APoFF – specified time for automatic shutdown and continuous ON

54: bAtt – query battery voltage

56: bEEP – set limit value for continuity testing

24: Measurement Data Recording

49: Direct and Pulsating Current Measurement with Clip-On Current Sensor A DC and A (DC+AC) 50: Alternating Current Measurement with Clip-On Current Sensor, A AC and Hz

54: dAtE – query date, 57: dAtE – enter date

24: Measurement Data Recording

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

59: Configuring Interface Parameters

54: ItEMP – query reference temperature

24: Measurement Data Recording

55: rAtE – set the sampling rate

55: rESoL – high resolution for V DC and W (customer-specific function)

58: Activating the Interface

55: Entering Parameters – SETUP Menu

24: Measurement Data Recording

33: Temperature Measurement: Temp RTD and Temp TC

54: tiME – query time, 57: tiME – set time

56: U_ISo – select test voltage

56: RPM – revolutions per minute (customer-specific function)

54: vErSion – query firmware version

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

6.3 Querying Parameters – InFo Menu (as moving letters)

bAtt – query battery voltage

1nFo bAtt

2.75 V.

vErSion – query firmware version

1nFo bAtt:

 uErS ion

1.00

ItEMP – query reference temperature

The temperature of the internal reference junction is measured with a temperature sensor in close proximity to the input sockets.

1nFo bAtt:  ... 

1tEMP: 24

°C

dAtE – query date

1nFo bAtt:

D = day, M = month, Y = year



... 

dAtE: 31.12.

05 (DD.MM.YY)

Date and time must be reentered after replacing the batteries.

tiME – query time

1nFo bAtt

t iME: 13:46:

: 

... 

(hh:mm:ss)

h = hours, m = minutes, s = seconds

Date and time must be reentered after replacing the batteries.

OCCUP – query memory occupancy

: 

... 

0CCvP:

000.0

1nFo bAtt

54 GMC-I Messtechnik GmbH

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

6.4 Entering Parameters – SETUP Menu

rAtE – set the sampling rate

The sampling rate specifies the time interval after which the respective measured value is transmitted to the interface, or to measured value memory.

Any one of the following sampling rates can be selected: [mm:ss.t]: 00:00,1, 00:00,2, 00:00.5, 00:01,0, 00:02,0, 00:05.0 [h:mm:ss.t] (h=hours, m=minutes, s=seconds

, z=tenths of a sec.

): 0:00:10, 0:00:20, 0:00:30, 0:00:40, 0:00:50, 0:01:00, 0:02:00, 0:05:00, 0:10:00, 0:20:00, 0:30:00, 0:40:00, 0:50:00, 1:00:00, 2:00:00, 3:00:00, 4:00:00, 5:00:00, 6:00:00, 7:00:00, 8:00:00, 9:00:00

Setting the Sampling Rate

1nFo

 ... 

SET rAtE

00:00.1 ... 00:00.5 ... 9:00:00 

(00:00.5 = 0.5 s = default value)

rESoL – high resolution for V DC and  (customer-specific function)

Switching back and forth between 3¾ and 4¾ places is possible for direct voltage and resistance measurement.

 ...  SET rAtE  ...  resol

1nFo

0.diSP – show/hide leading zeros

This parameter determines whether or not leading zeros will appear in the measured value display.

1nFo

 ... 

SET rAtE  ...  0.diSP

0000.0 : with leading zeros (default value)

0.0 : leading zeros suppressed



A.diSP – Select display mode for the analog display

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

• bArG: bar graph

• Point: pointer

 ...  SET rAtE  ...  A.diSP

1nFo

bArG / Point 

CLIP – set current clip factor

3000 / / 30000

(3000 = default setting)

GMC-I Messtechnik GmbH 55



See chapter 5.9.3, chapter 5.9.4 and chapter 5.9.5.

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

APoFF – specified time for automatic shutdown and continuous ON

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 the specified time “APoFF” (entered in minutes) has elapsed.

If the on setting is selected, the multimeter is set for long-term measurement and

ON appears in the display to the right of the

battery symbol. In this case, the multimeter can only be switched off manually. The “on” setting can only be cancelled by changing the respective parameter, and not by switching the instrument off.

 ...  SET rAtE  ...  APoFF

1nFo

10 ... 59 min on



(10 minutes = default setting)

U_ISo – select test voltage

The desired test voltage for insulation resistance measurement can be selected here:

 ...  SET rAtE  ...  v1so

1nFo

... 500, 1000 V* 

RPM – revolutions per minute (customer-specific function)

See section 5.1.2 regarding settings.

bEEP – set limit value for continuity testing

 ...  SET rAtE  ...  bEEP

1nFo

1, 10, 20, 30, 40, 90 



(10  = default setting)

irStb – status of the infrared receiver in the stand-by mode

See chapter 7.2 on page 59 regarding settings.

Addr – set device address

See chapter 7.2 on page 59.

* Selectable test voltages and the default setting depend upon the

respective customer-specific variant.

56 GMC-I Messtechnik GmbH

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

ZERO

ESC

ON / OFF

LIGHT

dAtE – enter date

Entering the current date makes it possible to acquire measured values in real-time.

1nFo

 ...  SET rAtE  ...  dAtE

31.12 (DD: day . MM: month)

2005 (YYYY: year)

 

Date and time must be reentered after replacing the batteries.

tiME – set time

Entering the correct time makes it possible to acquire measured values in real-time.

 ...  SET rAtE  ...  t iME

1nFo

10:24 (hh:mm)

 

Date and time must be reentered after replacing the batteries.

6.5 Default Settings

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

• after the occurrence of software or hardware errors,

• if you are under the impression that the multimeter does not work correctly.

➭ Disconnect the device from the measuring circuit.

➭ Remove the batteries temporarily (see also chapter 9.2).

➭ Simultaneously press and hold the and

keys, and connect the battery at the same time.

A sequence of acoustic signals consisting of two immediately consecutive tones acknowledges successful resetting.

GMC-I Messtechnik GmbH 57

Interface Operation

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

7 Interface Operation

The multimeter is equipped with an infrared interface for the transmission of measurement data to a PC. Measured data are optically transferred through the instrument housing by means of infrared light to an interface adapter (accessory), which is attached to the multimeter. The adapter’s USB interface allows for the establishment of a connection to the PC via an interface cable. Beyond this, commands and parameters can be transmitted from the PC to the multimeter as well. The following functions can be executed:

• Configuration and read-out of measuring parameters,

• Measuring function and measuring range selection,

• Start measurement,

• Read out stored measured values.

7.1 Activating the Interface

The interface is automatically activated for receiving operation (multimeter receives data from the PC) as soon as the interface is addressed by the PC, assuming that the “irStb” parameter has been set to “ir on” (see chapter 7.2), or the instrument is already switched on (the first command wakes up the multimeter, but does not yet execute any further commands).

The “continuous transmission” operating mode is selected manually as described below. In this operating mode, the instrument continuously transmits measurement data to the PC via the interface adapter, which can then be displayed with the help of a terminal program.

Starting Continuous Transmission Operation with Menu Functions

 ...  SEnd StArt send

1nFo

The symbol blinks at the display in order to indicate interface operation.

Stopping Continuous Transmission Operation with Menu Functions

1nFo

 ...  SEnd send

stop send

The symbol is cleared from the display.

Automatic Activation and Deactivation of Transmission Mode Operation

If the sampling rate is 10 seconds or longer, the display is switched off automatically between samples in order to prolong battery service life. The only exception is when the multimeter is set to continuous operation. As soon as an event occurs, the display is automatically switched back on.

58 GMC-I Messtechnik GmbH

Interface Operation

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

7.2 Configuring Interface Parameters

irStb – status of the infrared receiver in the stand-by mode

There are two possible switching statuses for the infrared interface when the multimeter is switched off:

ir on: IR appears at the display and the infrared interface is

active, i.e. signals such as making commands can be received, and power is consumed even though the multimeter is switched off.

ir oFF: IR does not appear at the display and the infrared

interface is switched off, signals cannot be received.

 ...  SET rAtE  ...  irStb

1nFo

ir on / ir oFF 

(irstb = ir oFF = default setting)

Addr – Address

If several multimeters are connected to the PC via an interface adapter, a separate address can be assigned to each instrument. Address number 1 should be selected for the first instrument, 2 should be assigned to the second and so forth.

1nFo

 ...  SET rAtE  ...  Addr

00 ... 01 ... 15



(15 = default setting)

GMC-I Messtechnik GmbH 59

Technical Data

8 Technical Data

Meas.

Measuring Range

Function

(input)

300.0 mV 10 V 100 V9M 9M // < 50 pF 0.15 + 15

3.000 V 100 V1mV 9M 9M // < 50 pF 0.15 + 15 0.15 + 2

30.00 V 1mV 10mV 9M 9M // < 50 pF 0.15 + 15 0.15 + 2

300.0 V 10 mV 100 mV 9 M 9M // < 50 pF 0.15 + 15 0.15 + 2 1000 V 100 mV 1 V 9 M 9M // < 50 pF 0.15 + 15 0.2 + 2

300.0 A 100 nA 18 mV 18 mV 0.5 + 5

3.000 mA 1 A 160 mV 160 mV 0.2 + 3

@ A

@ V



30.00 mA 10 A 32 mV 32 mV 0.5 + 3

300.0 mA 100 A 200 mV 200 mV 0.2 + 3

3.000 A 1 mA 120 mV 120 mV 1 + 5

10.00 A 10 mA 400 mV 400 mV 1 + 5

Factor 1:1/10/100/1000

0.03/0.3/3/30 A 30 mA

0.3/3/30/300 A 300 mA 3/30/300/3k A

0.3/3/30/300 A 300 mV

3/30/300/3k A 3 V 1.5 + 3 (> 30 D)

30/300/3k/30k A

300.0  10 m 100m < 1.4 V Approx. 300 A

3.000 k 100 m 1  < 1.4 V Approx. 200 A 0.5 + 15 0.5 + 2

30.00 k 1  10  < 1.4 V Approx. 30 A 0.5 + 15 0.5 + 2

300.0 k 10  100  < 1.4 V Approx. 3 A 0.5 + 15 0.5 + 2

3.000 M 100  1k < 1.4 V Approx. 0.3 A 0.5 + 15 0.5 + 2

30.00 M 1k 10 k < 1.4 V Approx. 33 nA 2.0 + 20 2.0 + 5

300.0  100 m ca. 10 V

5.1 V

Resolution

at Upper Range Limit

30000 3000

Input Input impedance

3 A Plus clip-on current transformer error 3 A 5 min

30 V Plus clip-on current sensor error

1mV ca. 10 V 2 + 5

Input Impedance

~ /

Voltage drop at approx. range limit

Current measurement input

(jack A~)

Voltage measurement input approx. 9 M

Open-circuit

voltage

(V socket)

Meas. current at

range limit

Approx. 1 mA const.



Intrinsic Uncertainty

under Reference Conditions

30000 3000 3000 3000

10)

(... % rdg. + ... d)

30000 3000

0.5 + 15 with ZERO active

(... % rdg. + ... d)

0.2 + 3

—

0.5 + 3

0.5 + 3 with ZERO active

3 + 5

1) 11)

10)

1 + 3 (> 100 D)

1 + 3 (> 30 D)

1) 11)

1.5 + 5 (> 100 D) 1.5 + 5 (> 100 D)

1.5 + 5 (> 30 D)

1) 11)

1.5 + 5 (> 100 D)

1.5 + 3 (> 300 D) 1.5 + 5 (> 300 D)

1) 11)

1.5 + 5 (> 100 D)

1) 11)

1.5 + 5 (> 100 D)

1) 11)

— 0.3 A Cont.

1.5 + 5 (> 100 D)

Overload

Capacity

Value Time

1000 V

DC AC

Cont.

RMS

Sine

0.3 A Cont.

10 A 5 min

Meas. input 6):

1000 V

max. 10 s

RMS

1000 V

DC AC

max. 10 s

RMS

Sine

12)

60 GMC-I Messtechnik GmbH

Technical Data

Meas.

Function

Measuring Range

(input)

30.00 nF 10 pF 10 M 0.7 V

300.0 nF 100 pF 1 M 0.7 V 1 + 6

3.000 F1nF100k 0.7 V 1 + 6

30.00 F10nF12k 0.7 V 1 + 6

300.0 F 100 nF 3 k 0.7 V 5 + 6

Hz (V)/

Hz (A)

Hz (A

Hz (V)

C

15 ... 45 ... 65 Hz ... 10 (5) kHz sine. See following page for influences.

At 0  ... + 40 C

Display of up to max. 5.1 V, “OL” in excess of 5.1 V.

Applies to measurements at film capacitors and battery operated

Lowest measurable freq. for sinusoidal meas. signals symmetrical to zero point

Overload capacity of the voltage measurement input: power limiting: frequency x max. voltage 3 x 10

Overload capacity of the current measurement input:

See current measuring ranges for maximum current values.

Input sensitivity, sinusoidal signal, 10% to 100% of the voltage or current mea-

GMC-I Messtechnik GmbH 61

300.0 Hz 0.1 Hz

3.000 kHz 1 Hz

30.00 kHz 10 Hz 10 Hz

)

300.0 kHz 100 Hz 100 Hz

2.0 .... 98.0

10.0...90.0

5.0 .... 95.0

10.0...90.0

– 200.0 ...

Pt 100

+850.0 C

– 150.0 ...

+850.0 C – 250.0 ...

(NiCr-Ni)

+1372.0C

Resolution

at Upper Range Limit

3000

Resolution Voltage-R

0.1 %

0.1 C

V x Hz @ U > 100 V

Discharge resist. U

13)

3 V

30 V

300 V & 1000 V possible, but not specified

0 max

min

1Hz

Frequency-R

15 Hz ... 1 kHz 1 kHz ... 4 kHz 15 Hz ... 1 kHz 1 kHz ... 4 kHz

10)

11)

12)

13)

Key: R = meas. range, d = digit(s), rdg. = measured value (reading)

Intrinsic Uncertainty

under Reference Conditions

(... % rdg. + ... d)

1 + 6

with ZERO function active

(... % rdg. + ... d)

0.1 + 2

(... % R + ... d)

0.2% R + 8 d 1000 V

0.2% R/kHz + 8 d

0.2% R + 8 d

0.2% R/kHz + 8 d

(... % rdg. + ... d)

0.5 %+ 15

1% + 5 K

suring range; limitation: up to 30% of the range at up to 100 kHz in the mV measuring range, 30% of the range in the 3 A measuring range. The voltage measuring ranges with max. 30 kHz apply in the A measuring range. Plus sensor deviation With ZERO function active Residual value of 1 to 10 d with short circuited terminal tips, exception: mV / A range of 1 to 35 d at zero point due to the TRMS converter 10 minute cool-down period Required signal range 30% to 100% of the voltage measuring range

Overload

Capacity

Value Time

1000 V

max. 10 s RMS Sine

Hz (V) 6):

Hz(A )

max. 10 s

1000 V

Hz (A):

AC RMS Sine

1000 V

DC/AC

max. 10 sPt 1000

RMS Sine

Cont.

Technical Data

Insulation Resistance Measurement

Measuring Range Resolution

0,3 V ... 1000 V

5 ... 310.0 k 0.1 k

0.280 ... 3.100 M 1 k

02.80 ... 31.00 M 10 k

028.0 ... 310.0 M 100 k 0280 ... 3100 M 1 M

During insulation measurement (M

limits:

interference

Ri < 100 k @ Uiso 100 V, Ri < 250 k@ Uiso 250 V, Ri < 500 k@ Uiso 500 V, Ri < 1000 k @ Uiso 1000 V

Interference voltage measurement TRMS (V AC + DC) with 1 M input resistance, Bandwidth 15 Hz ... 500 Hz, measuring error 3% + 30 Digit and in the 3 V and 30 V range, all values < 0.29 V are suppressed

> 10....20 V and U

Test voltage

ISO

Ri=1M

500/1000 V

„Error“

 U



ISO

50/100/250/500 V 50/100/250/500/1000 V 50/100/250/500/1000 V 50/100/250/500/1000 V

@UISO

interference

Digital Display

Intrinsic

Uncertainty

under Reference

Conditions

3 + 30 > 100 Digit

3 + 5 3 + 5 5 + 5 5 + 5 5 + 5

is displayed >>

, Ri < 50 k@ Uiso 50 V,

Interturn Short-circuit Measurement (METRAHIT COIL only)

Measuring Range Resolution

0.3 V ... 1000 V

10.0 ... 30.9 μs 0.1 [μs] 31 ... 250 μs 1 [μs]

Interference voltage measurement TRMS (V AC + DC) with an input resistance of 1 M, frequency response width 15 Hz ... 500 Hz, accuracy of 3% + 30 digits; in the 3 V and 30 V range, all values below 0,29 V are suppressed

Nominal Voltage

ISO

Ri=1M



1000 V

Intrinsic Uncertainty at

Reference Conditions

3 + 30 > 100 digits

10 + 5 digits

Short circuit measurement in the inductivity range: 10 H to 50 mH @ 100 Hz

Internal Clock

Time format TT.MM.JJJJ hh:mm:ss



(% rdg. + d)

Resolution 0.1 s

Measuring

Function

interference

M

@UISO

M

@UISO

Open-

Nom.

Circuit

Voltage U

Voltage

— —— —

50, 100,

250,

500 V

@UISO

1000 V max.

M

62 GMC-I Messtechnik GmbH

max.

1.1x U

Nom.

ShortCircuit Current I

Acoustic Signal for

Current I

U>1000V 1000 V

1.0 mA < 1.2mAU>1000V 1000 V

Iso

0.5 mA < 1.2mAU>1000V 1000 V

Iso

Overload Capacity

Value Time

dauernd

10 s

Accuracy 1 minute per month Temperature influence

50 ppm/K

Influencing Quantities and Influence Error

Influencing

Quantity

Temperature

With zero balancing

Sphere of Influence

0 C ... +21 C

and

+25 C... +40 C

Measured Quantity /

Measuring Range

V 0.2 + 5

V 0.4 + 5

300  ... 3 M 0.5 + 5

30 M 1 + 5

mA/A 0.5 + 5

mA/A 0.8 + 5

30 nF ... 300 F1 + 5

Hz 0.2 + 5

C/F (Pt100/Pt1000) 0.5 + 5

Influence Error

(...% rdg. + ... d) / 10 K

Technical Data

Influ-

encing

Quan-

Frequency

Power limiting: frequency x voltage, max. 3 x 106 V x Hz

The accuracy specification is valid as of a display value of 10% and up

tity

Measured Quantity /

Measuring

Sphere of Influence

Intrinsic Uncertainty

 ... % rdg. + ... d)

Range

> 15 Hz ... 45 Hz 2 + 5 > 300 Digit

...

> 65 Hz ... 2 kHz 2 + 5 > 300 Digit

300 V

1000 V > 65 Hz ... 5 kHz 3 + 5 > 60 Digit

> 2 kHz ... 10 kHz 3 + 5 > 300 Digit

> 15 Hz ... 45 Hz

10 A

> 65 Hz ... 10 kHz > 15 Hz ... 45 Hz

10 A

> 65 Hz ... 10 kHz

> 65 Hz ... 10 kHz 3 + 5 > 300 Digit

> 65 Hz ... 10 kHz 3 + 30 > 300 Digit

+DC

300 mV

300 A ...

300 mV /

3 V / 30 V

30 mA...3 A

3 + 10 > 300 Digit

3 + 30 > 300 Digit

to 100% of the measuring range for both measuring modes with the TRMS converter in the A AC and A (AC+DC) ranges.

Influencing

Quantity

Crest Factor CF

Except for sinusoidal waveshape

Influencing

Quantity

Relative Humidity

Battery voltage 1.8 to 3.6 V ditto

Sphere of

Influence

1 ... 3

> 3 ... 5  3% rdg.

Sphere of

Influence

75%,

3 days,

instrument off

Measured Quantity /

Measuring Range

V, A

Influence Error

 1% rdg.

Measured Quantity Influence Error

V A, , F, Hz, C 1 x intrinsic uncertainty

Included in intrinsic uncer-

tainty

Influencing

Quantity

Common Mode Interference Voltage

Series Mode Interference Voltage

Sphere of Influence

Interference quantity max. 1000 V V > 120 dB

Interference quantity max. 1000 V

50 Hz ... 60 Hz, sine

Interference quantity: V ,

respective nominal value of the

measuring range,

max. 1000 V , 50 Hz ... 60 Hz sine

Interference quantity max. 1000 V

Measured Qty. /

Measuring Range

3 V , 30 V > 80 dB

300 V > 70 dB

1000 V > 60 dB

V> 50dB

V > 110 dB

Damping

GMC-I Messtechnik GmbH 63

Technical Data

Response Time (after manual range selection)

Measured Quantity /

Measuring Range

V, V A, A

300  ... 3 M 2s

30 M, M

@UISO

Continuity < 50 ms

C (Pt 100) Max. 3 s

30 nF ... 300 FMax. 5s

>10 Hz 1.5 s

Response Time

Digital Display

1.5 s

Max. 5 s

1.5 s

Measured Quantity

Jump Function

From 0 to 80%

of upper range limit value

From  to 50%

of upper range limit value

From 0 to 50%

of upper range limit value

Reference Conditions

Ambient temperature Relative humidity 40% to 75%

Meas. Qty. Freq. 45 Hz ...65 Hz Meas. Qty. Waveshape Battery voltage 3 V 0.1 V

+23 C 2K

Sine

Ambient Conditions

Accuracy range 0 C ... +40 C Operating temp. range Storage temp. range 25 C ... + 70 C (without batteries) Relative humidity 40 to 75%, no condensation allowed Elevation to 2000 m Deployment

10 C ... +50 C

Indoors, except within specified ambient conditions

Display

LCD panel (65 mm x 36 mm) with analog and digital display including unit of measure, type of current and various special functions

Background illumination

Background illumination is switched off approximately 1 minute after it has been activated.

Analog

Display LCD scale with pointer Scaling Linear

Polarity display With automatic switching Overflow display With the symbol Measuring rate 40 measurements per second and display

Digital

Display/Char. Height 7-segment characters / 15 mm Number of places 3¾ places, 3100 steps, convertible to

Overflow display “OL” is displayed for 3100 digits Polarity display “–” (minus sign) is displayed

Measuring rate 10 and 40 measurements per second with

Refresh Rate 2 times per sec., every 500 ms

5 ... 0 ... 30 with 35 scale divisions

for , 0 ... 30 with 30 scale divisions in all other ranges

refresh

4¾ places* in measuring function V DC and

if plus pole is connected to “”

the Min/Max function except for the capacitance, frequency and duty cycle measuring functions



* Function only available with customer-specific variant

64 GMC-I Messtechnik GmbH

Technical Data

Power Supply

Battery 2 ea. 1.5 V mignon cell (2 ea. size AA),

Service life With alkaline manganese batteries: approx.

Battery test Battery capacity display with battery

Power OFF function

Power pack socket

Measuring

Function

V 200 V 150

M

Times 0.7 for interface operation

Nominal

Voltage U

1000 V 2 M 200

alkaline manganese per IEC LR6

200 hours (without M



@UISO

measurement)

symbol in 4 segments: . Querying of momentary battery voltage via menu function.

The multimeter is switched off automatically: – If battery voltage drops to below approx.

1.8 V

– If none of the keys or the rotary switch are

activated for an adjustable duration of 10 to 59 minutes, and the multimeter is not in the continuous operation mode

If the power pack has been plugged into the instrument, the installed batteries are disconnected automatically. Rechargeable batteries can only be recharged externally.

Number of Possible

Measurements with

Nominal Current per

VDE 0413

Resistance

of the

100 V 1 M 50 100 V 100 k 3000 500 V 500 k 600

DUT

Service life

in Hours

Electrical Safety

Safety class I I per DIN EN 61 010-1:2011/

Measuring category CAT II CAT II I Nominal voltage 1000 V 600 V Fouling factor 2 Test voltage 5.2 kV~ per DIN EN 61010-1:2011/

VDE 0411-1:2011

Fuses

Fuse link FF 10 A/1000 V AC/DC;

10 mm x 38 mm; switching capacity: 30 kA at 1000 V AC/DC; protects the current measurement input in the 300 A through 10 A ranges

Electromagnetic Compatibility (EMC)

Interference emission Interference immunity

EN 61326-1:2013, class B EN 61326-1:2013 EN 61326-2-1:2013

GMC-I Messtechnik GmbH 65

Technical Data

Data Interface

Typ e Data transmission Serial, bidirectional (not IrDa compatible) Protocol Device specific Baud Rate 38,400 baud Functions – Select/query measuring functions

The USB X-TRA plug-in interface adapter (see accessories) is used for adaptation to the PC’s USB port.

Optical via infrared light through the housing

and parameters Query momentary measurement data

–

Internal Measured Value Storage

Memory capacity 4 MBit / 540 kB for approx. 15,000

measured values with indication of date and time

Mechanical Design

Housing Impact resistant plastic (ABS) Dimensions 200 x 87 x 45 mm

(without protective rubber cover) Weight Approx. 0.35 kg with batteries Protection Housing: IP 54

(pressure equalization by means of the housing)

Table Excerpt Regarding Significance of the IP Code

IP XY

Protection against

digit X)

foreign object entry

4  1.0 mm dia. 4 splashing water 5 dust protected 5 water jets

IP XY (2nd digit Y)

Protection against the penetration of water

66 GMC-I Messtechnik GmbH

Technical Data

GMC-I Messtechnik GmbH 67

Maintenance – Recalibration

Note

MEASURE

SETUP

FUNC

ENTER

9 Maintenance and Recalibration

Disconnect the instrument from the measuring circuit before opening the battery compartment lid or fuse cover when replacing batteries or fuses!

9.1 Displays – Error Messages

Message Function Meaning

FUSE

0L ur

error

Current measurement

In all operating modes

Measurement Indicates overflow



measurement

ISO



measurement

ISO

Blown fuse

Battery voltage has fallen below 1.8 V

Measured value of less than 10% of the measuring range

Interference voltage detected

9.2 Batteries

Removing the Batteries During Periods of Non-Use

The integrated quartz movement draws power from the batteries even when the instrument is switched off. It is advisable to remove the batteries during long periods of non-use for this reason (e.g. vacation). This prevents excessive depletion of the battery, which may result in damage under unfavorable conditions.

Battery Replacement

Stored measurement data are lost when the batteries are replaced. In order to prevent data loss, it is advisable to backup your data to a PC with the help of METRAwin 10 software before replacing the batteries. The selected operating parameters remain in memory, although date and time must be reentered.

Battery

The current battery charge level can be queried in the “1nfo” menu:

1nFo bAtt

2.75 V.

Make sure that no battery leakage has occurred before initial start-up, as well as after long periods of storage. Continue to inspect the batteries for leakage at short, regular intervals.

If battery leakage has occurred, carefully and completely clean the electrolyte from the instrument with a damp cloth, and replace the battery before using the instrument.

If the “ ” symbol appears at the display, the batteries should be replaced as soon as possible. You can continue working with the instrument, but reduced measuring accuracy may result.

The instrument requires two 1.5 V batteries in accordance with IEC LR 6, or two equivalent rechargeable NiCd batteries.

68 GMC-I Messtechnik GmbH

Maintenance – Recalibration

Attention!

Blown Fuse

fuse

Replacing the Batteries

Disconnect the instrument from the measuring circuit before opening the battery compartment lid in order to replace the batteries.

➭ Set the instrument face down onto the working surface.

➭ Turn the slotted screw on the lid with the battery symbols

counterclockwise.

➭ Lift off the lid and remove the batteries from the battery

compartment.

➭ Insert two new 1.5 V mignon batteries into the battery

compartment, making sure that the plus and minus poles match up with the provided polarity symbols.

➭ When replacing the battery compartment lid, insert the side

with the guide hooks first. Tighten the screw by turning it clockwise.

➭ Please dispose of depleted batteries in accordance with

environmental protection regulations!

9.3 Fuses

Testing the Fuse

The fuse is tested automatically:

• When the instrument is switched on with the rotary switch in the A position

• When the instrument is already on and the rotary switch is turned to the A position

• In the active current measuring range when voltage is applied

GMC-I Messtechnik GmbH 69

If the fuse is blown or has not been inserted, “FuSE” appears at the digital display. The fuse interrupts the current measuring ranges. All other measuring ranges remain functional.

Replacing the Fuse

If a fuse should blow, eliminate the cause of overload before placing the instrument back into service!

Disconnect the instrument from the measuring circuit before opening the fuse cover in order to replace the fuse!

➭ Set the instrument face down onto the working surface.

➭ Turn the slotted screw on the cover with the fuse symbol

counterclockwise.

➭ Lift off the cover and pry the fuse out using the flat side of the

fuse cover.

➭ Insert a new fuse. Make sure that the fuse is centered, i.e.

between the tabs at the sides.

➭ When replacing the fuse cover, insert the side with the guide

hooks first. Tighten the screw by turning it clockwise.

➭ Dispose of the blown fuse with the trash.

Maintenance – Recalibration

Attention!

Note

Pb Cd Hg

Use specified fuses only! If fuses with other blowing characteristics, other current ratings or other breaking capacities are used, the operator is placed in danger, and protective diodes, resistors and other components may be damaged. The use of repaired fuses or short-circuiting the fuse holder is prohibited.

Testing the Fuse with the Instrument Switched On After inserting the fuse with the instrument switched on, the instrument must be switched off briefly and then switched back on, or briefly switched to a non current measuring range and then back to the A measuring range. If contact is poor or the fuse is blown, FUSE appears at the display.

9.4 Housing Maintenance

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 or solvents.

9.5 Return and Environmentally Sound Disposal

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

We identify our electrical and electronic devices in accordance with WEEE 2012/19/EU and ElektroG with 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 page 4). 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.

70 GMC-I Messtechnik GmbH

Maintenance – Recalibration

9.6 Recalibration

The respective measuring task and the stress to which your measuring instrument is subjected affect the ageing of the components and may result in deviations from the guaranteed accuracy.

If high measuring accuracy is required and the instrument is frequently used in field applications, combined with transport stress and great temperature fluctuations, we recommend a relatively short calibration interval of 1 year. If your measuring instrument is mainly used in the laboratory and indoors without being exposed to any major climatic or mechanical stress, a calibration interval of 2-3 years is usually sufficient.

During recalibration* in an accredited calibration laboratory (DIN EN ISO/IEC 17025) the deviations of your instrument in rela-

tion to traceable standards are measured and documented. The deviations determined in the process are used for correction of the readings during subsequent application.

We are pleased to perform DAkkS or factory calibrations for you in our calibration laboratory. Please visit our website at

www.gossenmetrawatt.com ( Company  DAkkS Calibration Center or  FAQs  Calibration questions and answers)).

By having your measuring instrument calibrated regularly, you fulfill the requirements of a quality management system per DIN EN ISO 9001.

* Verification of specifications or adjustment services are not part of the

calibration. For products from our factory, however, any necessary adjustment is frequently performed and the observance of the relevant specification is confirmed.

9.7 Manufacturer’s Guarantee

All METRAHIT digital multimeters and calibration instruments are guaranteed for a period of 3 years after shipment. The manufacturer’s guarantee covers materials and workmanship. Damages resulting from use for any other than the intended purpose or operating errors, as well as any and all consequential damages, are excluded.

The calibration certificate confirms that the product conformed to the specified technical data at the time of calibration. We guarantee the observance of the specified technical data within the admissible tolerance limits for a period of 12 months from delivery.

GMC-I Messtechnik GmbH 71

Accessories

Attention!

10 Accessories

10.1 General

The extensive accessories available for our measuring instruments are checked for compliance with currently valid safety regulations at regular intervals, and are expanded as required for new applications. Currently up-to-date accessories which are suitable for your measuring instrument are listed at the following web address along with photo, order number, description and, depending upon the scope of the respective accessory, data sheet and operating instructions: www.gossenmetrawatt.de ( Products  Measuring Technology – Portable  Multimeters  METRAHIT ...  Accessories).

10.2 Technical Data for Measurement Cables (scope of delivery: KS17-2 safety cable set)

Electrical Safety

Maximum Rated Voltage Measuring Category

600 V 1000 V CAT IV CAT I I I CAT I I

Maximum Rated Current 1 A 1 A 16 A

with safety cap applied

without safety cap applied

—

——

Please observe the maximum values of the electrical safety of the instrument.

Ambient Conditions (EN 61010-031)

Tem pe ra tu re –2 0 C ... + 50 C Relative humidity 50 to 80% Contamination level

1000 V



Application KS17-2

In conformity with standard DIN EN 61010-031, measurements in an environment according to measuring category III may only be performed with the safety cap applied to the test probe of the measurement cable.

For establishing contact in 4 mm jacks you have to remove the safety cap by levering out the snap lock of the safety cap with another sharp object (e.g. the second test probe).

10.3 Power Pack NA X-TRA (not included)

Use only power packs from GMC-I Messtechnik GmbH only in combination with your instrument. This assures operator safety by means of an extremely well insulated cable, and safe electrical isolation (nominal secondary ratings: 5 V / 600 mA). Installed batteries are disconnected electronically if the power pack is used, and need not be removed from the instrument.

72 GMC-I Messtechnik GmbH

10.4 Interface Accessories (not included)

USB X-TRA Bidirectional Interface Adapter

This adapter makes it possible to connect cable multimeters, as well as STARLINE multimeters which are equipped with a serial IR interface, to the USB port at a PC. The adapter allows for data transmission between the multimeter and the PC.

METRAwin 10 PC Analysis Software METRAwin 10 PC software is a multilingual, measurement data log-

ging program* for recording, visualizing, evaluating and documenting measured values from METRAHIT multimeters.

Details on the system requirements are given in the installation instructions of METRAwin 10/METRAwin 45.

Accessories

* runs under any IBM compatible Windows operating system

GMC-I Messtechnik GmbH 73

Index

11 Index

Numerics

0.diSP ................................................................... 55

Addr ...................................................................... 59

APoFF ................................................................... 56

Auflösung, hohe bei V DC und Ohm ................... 55

Automatic Shutdown

........................................................ 17

Disable

Specify Time ............................................... 17

Auto-Range Function ........................................... 18

bAtt ....................................................................... 54

Batteries

Charge Level ............................................... 68

Level Indicator ............................................ 13

Periods of Non-Use .................................... 68

Replacement ............................................... 69

bEEP ..................................................................... 56

Cable Resistance ................................................. 33

Capacitance Measurement ................................. 38

Clip-On Current Sensor ................................. 49, 50

Continuity Test ..................................................... 36

Current Measurement

........................................................... 46

Notes

dAtE ................................................................ 54, 57

Default Settings .................................................... 57

Device Returns ..................................................... 70

Diode Test ............................................................. 37

Discharge ........................................................41, 45

Display Illumination ..............................................16

Duty Cycle Measurement .....................................30

Error ......................................................................41

Error Messages ....................................................68

Fuse

Replacement

............................................... 69

Interfaces

Accessories ................................................. 73

Statuses ....................................................... 13

Interturn Short-circuit Measurement ...................42

irStb ....................................................................... 59

itEMP .....................................................................54

Maintenance

Housing ....................................................... 70

Manufacturer’s Guarantee ................................... 71

Measured Value Storage

DATA Function ............................................21

MIN/MAX Values ......................................... 23

Measurement Cables ........................................... 72

Measuring Category

Significance Measuring Range Selection

Automatic .................................................... 18

................................................... 8

Manual .........................................................18

Memory

.............................................................25

Clear

Ending Recording ........................................25

Querying Occupancy ...................................25

Start Recording ............................................24

OCCUP ...................................................................54

Overview

Keys and Connections .................................12

Parameters ..................................................53

Power Pack

Accessories .................................................72

Initial Start-Up ..............................................16

Power Pack Adapter Socket

Position of the Connector Socket ...............15

Product Support ......................................................3

Product Support Hotline .........................................3

rAtE ........................................................................55

Recalibration Service ........................................4, 71

Recognition of Interference Voltage .....................41

Reference Junction ...............................................35

Repair and Replacement Parts Service .................4

Resistance Measurement .....................................31

Resolution, high for V DC and Ohm .....................55

RPM Measurement (function only available with customer-specific variant)

....................................31

74 GMC-I Messtechnik GmbH

Safety Precautions ................................................. 8

Software Enabling .................................................. 3

Standard Equipment .............................................. 2

Switching the Instrument On

Manual ........................................................ 16

Via PC .......................................................... 16

Symbols

Device .......................................................... 15

Digital Display ............................................. 13

Rotary Switch Positions .............................. 14

Temperature Measurement

with Resistance Thermometers

with Thermocouples ................................... 35

tiME ................................................................. 54, 57

................. 33

ur (under-range) ................................................... 68

Use for Intended Purpose .................................... 10

vErSion .................................................................. 54

Voltage Comparator ............................................. 29

Voltage Measurement

Notes ........................................................... 26

WEEE Mark ........................................................... 15

Index

GMC-I Messtechnik GmbH 75

Edited in Germany Subject to change without notice  A pdf version is available on the internet

GMC-I Messtechnik GmbH Südwestpark 15 90449 Nürnberg •

Germany

Phone +49 911 8602-111 Fax +49 911 8602-777 E-Mail info@gossenmetrawatt.com www.gossenmetrawatt.com

Gossen Metrawatt M246C, METRAHIT COIL User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Safety Features and Precautions

1.1 Use for Intended Purpose

1.2 Meanings of Danger Symbols

1.3 Meanings of Acoustic Warning Signals

2 Operating Overview – Connections, Keys, Rotary Switch, Symbols

3 Initial Start-Up

3.1 Batteries

3.2 Activation

3.3 Setting the Operating Parameters

3.4 Switching the Instrument Off

4 Control Functions

4.1 Selecting Measuring Functions and Measuring Ranges

4.1.1 Automatic Range Selection

4.1.2 Manual Measuring Range Selection

4.1.3 Quick Measurements

4.2 Zero Offset / Relative Measurements

4.3 Display (LCD)

4.3.1 Digital Display

4.3.2 Analog Display

4.4 Measured Value Storage: DATA (auto-hold / compare)

4.4.1 Function DATA during insulation measurement *

4.4.2 Saving Minimum and Maximum Values – MIN/MAX Function

4.5 Measurement Data Recording

5 Measurements

5.1 Voltage Measurement

5.1.1 Direct and Pulsating Voltage Measurement, V DC and V (DC+AC)

5.1.2 Alternating Voltage and Frequency Measurement V AC and Hz with Selectable Low-Pass Filter

5.3 Temperature Measurement: Temp RTD and Temp TC

5.3.1 Measurement with Resistance Thermometers

5.3.2 Measurement with Thermocouples, Temp TC

5.4 Continuity Test

5.5 Diode Testing with Constant Current of 1 mA

5.6 Capacitance Measurement

5.7.1 Preparing for Measurement

5.7.2 Performing the Insulation Measurement

5.7.3 Ending the Measurement and Discharging

5.8.1 Preparing the Measurement

5.8.2 Performing Interturn Short-circuit Measurement

5.8.3 Ending the Measurement and Discharging

5.9 Current Measurement

5.9.5 Alternating Current Measurement with A AC and Hz Clip-On Current Transformer

6 Device and Measuring Parameters

6.1 Paths to the Various Parameters 6.2 List of All Parameters

6.3 Querying Parameters – InFo Menu (as moving letters)

6.4 Entering Parameters – SETUP Menu

6.5 Default Settings

7 Interface Operation

7.1 Activating the Interface

7.2 Configuring Interface Parameters

8 Technical Data

9 Maintenance and Recalibration

9.1 Displays – Error Messages

9.2 Batteries

9.3 Fuses

9.4 Housing Maintenance

9.5 Return and Environmentally Sound Disposal

9.6 Recalibration

9.7 Manufacturer’s Guarantee

10 Accessories

10.1 General

10.2 Technical Data for Measurement Cables (scope of delivery: KS17-2 safety cable set)

10.3 Power Pack NA X-TRA (not included)

10.4 Interface Accessories (not included)

11 Index