Gossen Metrawatt M248B, M248A, METRAHIT ULTRA, METRAHIT ULTRA BT User guide

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Operating Instructions

METRAHITULTRA and METRAHITULTRA BT

High Resolution TRMS Digital Multimeter

3-349-684-03

9/5.17

Scope of Delivery Contact Persons

Scope of Delivery

1Multimeter 1 KS17-2 measurement cable set 2 Batteries 1 DAkkS calibration certificate 1 Rubber holster 1 Condensed operating instructions *

* Detailed operating instructions are available for download on the Internet

at www.gossenmetrawatt.com

Included Functions

Function METRAHIT ULTRA /

Voltage, V

(Ri 10 M) ✓

Voltage, VAC TRMS (Ri  5 M) ✓

Voltage, V

Frequency, Hz @ VAC @ V

TRMS (Ri 5 M) ✓

AC+DC

1 kHz low-pass filter @ V

Bandwidth @ V

AC+DC

or V

Pulse frequency, MHz @ 5 V TTL 1 Hz to 1 MHz

Duty cycle as %

Voltage level measurement, dB @ V Resistance,  ✓ Continuity test, ICONST = 1 mA ✓

Diode test,

= 1 mA ✓

CONST

Temp. measurement C/F @ T Temp. measurement C/F R

Capacitance measurement, F ✓

METRAHIT ULTRA BT

M248A / M248B

Up to 300 kHz

@ V

AC+DC

100 kHz

2.0% to 98%

@ V

AC+DC

Typ e K

Pt100/Pt1000

Function METRAHIT ULTRA /

METRAHIT ULTRA BT

M248A / M248B

Current, A

Bandwidth @ A

Frequency, Hz @ A

Current clamp measurement with adjustable transformation ratio

Data logger function

Relative value measurement

AC+DC

TRMS

or A

AC+DC

@ V

AC+DC

(memory) 16 MBit (2 MB)

REL ✓

300 A / 3 mA

30 mA / 300 mA

3A / 10

A (16 A)

10 kHz

Up to 30 kHz

mV / A

mA / A

Zero point ✓ Min / Max / Data Hold ✓

IR interface (38.4 kBd)

Bluetooth interface (38.4 kBd)

Power pack socket

✓

M248B only

✓

Rubber holster ✓

Fuse 10 A / 1000 V

Protection IP 52

Measuring category 600 V CAT III

300 V CAT IV

DAkkS Calibration Certificate

16 Mbit = 2048 kByte = 300,000 measured values,

✓

sampling rate adjustable from 0.1 seconds to 9 hours

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 high levels of safety.

This instrument fulfills the requirements of the applicable EU guidelines and national regulations. We confirm this with the CE mark. The relevant declaration of conformity can be obtained 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.

If dangerous voltages are applied in the high-impedance voltage measuring functions (switch position V), switching to low-impedance measuring functions (switch position , continuity, temperature or capacitance) causes “HiVoLt” to appear at the display and the respective measurement is disabled.

Hazardous touch voltages are not detected when the ohm or capacitance measurement is selected.

If the instrument switches itself off in the event that hazardous touch voltage is applied (only possible during memory mode operation), the high-voltage warning symbol remains visible at the display.

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:

III

Stationary consumers, distributor terminals, devices connected permanently to the distributor

Measurements at power sources for low-voltage installations:

meters, mains terminals, primary overvoltage protection devices

The measuring category and the maximum rated voltage which are printed on the device apply to your measuring instrument, for example 600 V CAT III.

Refer to section 10 regarding use of the measurement cables.

Observe the following safety precautions:

• The multimeter may not be used in potentially explosive atmo-

spheres or in the vicinity of unprotected detonators or other ex-

plosive material.

•The Bluetooth function may not be activated on board of air-

crafts according to the FCC or FAA guidelines as critical aircraft instruments might be disturbed.

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Safety Precautions

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

• Maximum allowable voltage between the voltage measuring sockets or all connector sockets and ground is 600 V for measuring category III and 300 V for measuring category IV.

• Be aware of the fact that dangerous voltage peaks with significant frequency components of greater than 1 kHz are not displayed when the low-pass filter is activated. We recommend measuring voltage without the low-pass filter first, in order to be able to detect any dangerous voltages.

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

• Make certain that the measurement cables are in flawless condition, e.g. no damage to insulation, no interruptions in cables or plugs etc.

• No measurements may be made with this instrument in electrical circuits with corona discharge (high-voltage).

• Special care is required when measurements are made in HF electrical circuits. Dangerous pulsating voltages may be present.

• Measurements under moist ambient conditions are not permitted.

• Be absolutely certain that the measuring ranges are not overloaded beyond their allowable capacities. Limit values are included in section 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.

• Observe visual and acoustic warning signals!

• 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. Use specified fuses only (see page 63)! The fuse must have a breaking capacity of at least 30 kA.

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Safety Precautions

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 performing repairs or replacing 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)

1.1 Use for Intended Purpose

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

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

• The measuring instrument, including measurement cables and plug-on test probes, may only be utilized up to the maximum specified measuring category (see page 63 and the table on page 8 regarding significance). If the measuring categories specified for the measuring instrument and the measurement cables differ from each other, the lower category applies to the application.

• Overload limits may not be exceeded. See technical data on page 58 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 64).

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Safety Precautions

Note

1.2 Meanings of Danger Symbols

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

Symbol on the LCD: Warning concerning dangerous voltage at the measurement input: U > 45 V

The auto power off function (APoFF parameter) is deactivated when dangerous touch voltage is applied.

1.3 Meanings of Acoustic Warning Signals

Voltage warning: > 600 V (intermittent acoustic signal)

Current warning: > 10 A (intermittent acoustic signal)

Current warning: > 16 A (continuous acoustic signal)

GMC-I Messtechnik GmbH 11

Operating Overview – Connections, Keys, Rotary Switch, Symbols

section 4.3

section 3 section 5

section 7

section 6

section 3 ff.

section 3

section 4.1

Max. 600 V!

section 4.1 

section 4.4 

section 6 

section 3 

section 6 

section 3.1 

section 1.2

Operating Overview – Connections, Keys, Rotary Switch, Symbols

1 Display (LCD) (see page 14 for significance of symbols) 2 MAN / AUTO shift key for manual/automatic range selection

 Increase parameter values

Operating mode menu:

ON / OFF | LIGHT

, on/off key for switching device and display light

select menu entries against flow direction

4 FUNC | ENTER multifunction key

Operating mode menu: acknowledge entry (ENTER)



Increase measuring range or move decimal point to right (MAN function)

5 6 Rotary switch

for measuring functions,

bols)

7 DAkkS calibration seal

(see

page 15

for significance of sym-

8 Connector socket for ground / connected to ground 9 Connector socket for current measurement with auto-blocking

10 Connector socket for voltage, resistance, temperature, diode and capaci-

tance measurement with automatic blocking

11 DATA/MIN/MAX

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

 Decrease values

Operating mode menu: select of menu entries in flow direction

12 MEASURE | SETUP

Key for switching between measuring and menu functions

13 ZERO | ESC

Key for zero balancing Operating mode menu: Exit current menu level and return to a

higher level, exit parameters configuration without saving data



Decrease measuring range or move decimal to left (MAN function)

14 15 Power pack connector jack 16 Infrared interface

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Symbols Used in the Digital Display 1 Battery level indicator

Battery full

Battery OK

Battery weak

Battery (almost) dead, U < 1.8 V

Data transmissionto /  from multimeter active

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

Battery Level Indicator

Interface Indicator

1 26

4 5

23 262019

21 22 25 27 28 29

Operating Overview – Connections, Keys, Rotary Switch, Symbols

2 ON: continuous operation (automatic shutdown deactivated) 3 DATA: display memory, “freeze measured value” 4 STORE: memory mode active 5 FILTER: low-pass filter active 6 IR: infrared interface indicator 7 Bluetooth interface control display 8 Auxiliary display: digital display with decimal point and polarity display

9 Transformation ratio (factor for current sensor and transformer clamps) 10 dB: alternating voltage level measurement 11 Selected type of current 12 TRMS measurement 13 Unit of Measure

14 Warning regarding dangerous voltage: U > 45 V AC/DC

Main display

16 Continuity test with acoustic signal active 17 Pt100/Pt1000: selected platinum resistance sensor with automatic recog-

nition of Pt100/Pt1000 18 TC: temperature measurement with type K thermocouple (NiCr-Ni) 19 h (hours): unit of time 20 MAN: manual measuring range selection active 21 ZERO: zero balancing active 22 REL: relative measurement with reference to offset 23 min: minimum value storage 24 Diode measurement selected 25 max: maximum value storage

Stopwatch active or time since beginning of measurement

26 27 ON: no function here 28 sec (seconds): unit of time 29 Upm : no function here

: digital display with decimal point and polarity display

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Operating Overview – Connections, Keys, Rotary Switch, Symbols

1kHz

AC DC+

AAA

Symbols Used for Rotary Switch Positions

Switch V~ 0/4 V~ AC TRMS Hz Alternating voltage, AC TRMS, full bandwidth / voltage frequency Hz (V) 1 Hz V~ AC Voltage frequency, up to 300 kHz / alternating voltage, AC TRMS V~ 2 V FILTER ~ AC TRMS Hz Alternating voltage, AC TRMS, with low pass filter (1 kHz) / voltage frequency dB 3 dB V~ AC TRMS Alternating voltage level measurement V 0/4 V DC +AC TRMS Hz Pulsating voltage, TRMS ( ) / voltage frequency V 1 Hz V DC + AC TRMS Voltage frequency / pulsating voltage, TRMS V 2 V FILTER DC+AC TRMS Hz Pulsating voltage, TRMS with low pass filter (1 kHz) / voltage frequency dB 3 dB V DC + AC TRMS Alternating voltage level measurement V 0/2 V DC — Direct voltage

MHz 0/2 MHz

% 1 % Hz Duty cycle / frequency



Temp. T C 0/2 Temp. R T D 1°Pt100 Temperature with Pt100 / Pt1000 resistance sensor

A 0/3 A DC — Direct current value A 1 A DC+AC TRMS Hz Pulsating current amperage, TRMS AC+DC / current frequency A 2 Hz A DC+ AC TRMS Frequency / pulsating current amperage, TRMS AC DC A~ 0/2 A~ AC TRMS Hz Alternating current amperage, TRMS AC / current frequency Hz (A) 1 Hz ~ AC Hz ~ AC Current frequency / alternating current amperage, TRMS AC

Hz ( ) 1 Hz ~ AC ~ AC Current frequency

FUNC

Main Display Auxiliary Display Measuring Function

—

(High) frequency at 5 V~ up to 1 MHz

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

V DC — Diode voltage up to max. 4.5 V

C, type K C internal temp. at jacks

Temperature, type K thermocouple

— nF — Capacitance

0/3 A DC — DC amperage with AC DC Current clamp sensor, 1 V:1/10/100/1000 A

A DC +AC TRMS Hz

Hz A DC+ AC TRMS

0/2 A~ AC TRMS Hz Alternating current amperage, TRMS, with Current clamp sensor, see above

Pulsating current amperage, TRMS / current frequency with AC DC current clamp sensor, see above

Current frequency / pulsating current amperage, TRMS, with AC DC current clamp sensor, see above

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Operating Overview – Connections, Keys, Rotary Switch, Symbols

5V/600mA

XY123

2012-06

D-K

15080-01-01

Consecutive number

Registration number Date of calibration (year – month)

Deutsche Akkreditierungsstelle GmbH – calibration lab

User Interface Symbols in the Following Sections

 ...  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

CAT III / IV Measuring category III or IV device, see also

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

Continuous, doubled or reinforced insulation

▲IR ▼ Position of the infrared interface, window on the top of

the instrument

Position of the power pack adapter socket, see also section 3.1

Fuse for current measuring ranges, see section 9.3

This device may not be disposed of with the trash. Further information regarding the WEEE mark can be accessed on the Internet at www.gossenmetrawatt.com under the search term WEEE (see also section 9.5).

Calibration Seal (blue seal):

See also “Recalibration” on page 69.

EC mark of conformity

GMC-I Messtechnik GmbH 15

Initial Start-Up – Setup

Attention!

Note

3 Initial Start-Up

3.1 Inserting Batteries or Rechargeable Batteries

Be certain to refer to section 9.2 regarding correct battery installation.

Momentary battery voltage can be queried in the Info menu (see section 6.3).

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

Operation with the Power Pack (accessory for METRAHIT ULTRA, not included, see section 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 Switching the Instrument On

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 that the “irStb” parameter has been set to “ir on” (see section 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 section 9.2).

3.3 Setting the Operating Parameters

Setting Time and Date

See the “t iME” and “dAtE” parameter in section 6.4.

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ON / OFF

LIGHT

FUNC

ENTER

ON / OFF

LIGHT

Auto-Range

8.8.8.8.8

Illumination ON

000.00

ON / OFF

LIGHT

Illumination OFF

000.00

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.

If hazardous contact voltage has been detected (HV symbol appears), the instrument cannot be switched off.

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 approx. 0.8% of the measuring range per minute or 1 C or 1 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 51). Shutdown is acknowledged with a brief acoustic signal.

Automatic shutdown is disabled in the following operating modes: continuous operation and whenever dangerous contact voltage has been detected (exception: memory mode).

Disabling Automatic Shutdown

The instrument can be set to continuous operation.

➭ While switching the instrument on, simultaneously press the

and keys to this end.

Initial Start-Up – Setup

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

ON display to the right of the battery symbol.

The “Continuous On” setting can only be canceled by changing the respective parameter (see “APoFF” page 51) or by switching the instrument off manually. In this case, the parameter is reset to 10 minutes.

GMC-I Messtechnik GmbH 17

Control Functions

230.00

050.00

TRMS

U > 45 V:



Te mp

Tem p

RTD

hivolt

4 Control Functions

4.1 Selecting Measuring Functions and Measuring Ranges

The rotary switch is linked to the automatic socket blocking mechanism, which only allows access to two connector jacks for each function. Be certain to remove the appropriate plug from its respective jack before switching to and from the “A” functions. The socket blocking mechanism prevents the user from inadvertently turning the selector switch to impermissible functions after the measurement cables have been plugged into the instrument.

Presence of Dangerous Touch Voltages

If dangerous voltages are applied in the high-impedance voltage measuring functions (switch position V or PQ), switching to low-impedance measuring functions (switch position MHz, , continuity, temperature or capacitance) causes “HiVoLt” to appear at the display and the respective measurement is disabled. The measuring function is not switched until dangerous touch voltage is no longer applied to the input. If the instrument switches itself off in the event that hazardous touch voltage is applied (during memory mode operation with large

18 GMC-I Messtechnik GmbH

sampling period), the high-voltage warning symbol remains visible at the display.

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.

AUTO-Range Function

The instrument is switched automatically to the next higher range at (310,000 d + 1 d) 031,000 digits, and to the next lower range at (28,000 d – 1 d)  27,999 digits.

The instrument automatically switches to the next higher or next lower measuring range for the following measured quantities:

Measuring Range

V, A, , Hz 5¾ 310,000 28,000

V , V , A , A 4¾ 31,000 2800

3 nF ... 3 mF 3¾ 3100 280

Resolution

Switching to Next

Higher Range

at (... d + 1 d)

Switching to Next

at (... d -1 d)

Lower Range

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

 scroll key.

The instrument is automatically returned to automatic 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* 3V 30 V 300 V 600 V

Hz (V AC)

:300 Hz 3 kHz 30 kHz 300 kHz

MHz:

300 Hz  3 kHz  30 kHz  300 kHz  1 MHz



 or 

MAN / AUTO

* Via manual measuring range selection only

300

A :

300A 3 mA 30 mA 300 mA 3A 10 A (16 A)

Hz (A AC):

300 Hz 3 kHz 30 kHz

F :

3 nF30 nF 300 nF 3F 30F 300F 

3

Return to automatic measuring range selection —

Manual mode active:

utilized measuring range is fixed



3 k



30 k



300 k



3 M



30 M

MAN



MAN

Control Functions

GMC-I Messtechnik GmbH 19

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 section 4.1.2)

•With the DATA function (see section 4.4). In this way, the appro- priate 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 offset 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 D to (150,000 digits) 50% of the measuring range 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.

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 can display a residual value of 1 to 30 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 of the measuring range.

Setting the Reference Value

➭ Plug the measuring cables into the instrument and measure a

reference value (max. 150,000 digits, in the 10 A DC range: 50,000 digits = 50% of the measuring range).

20 GMC-I Messtechnik GmbH

➭ 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 main display only.

• In the case of relative measurement,  F or AC quantities may

also appear as negative values.

4.3 Display (LCD)

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 plus pole of the measured quantity is applied to the “” input.

Overranging

If the upper range limit of 31,000 digits is exceeded “0L” (overload) appears at the display. “0L” appears at the display as of 3100 digits during capacitance measurement, as well as during continuity and diode testing.

Control Functions

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Control Functions

Note

V, A , Hz

t [s]

300000

30000

Activated

Reactivated

Save

of Measuring Range

100 %

10 %

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)

DATA

Function

Press

DATA /

Min-Max

Condition

Measuring

Function

Measuring

Signal

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 a brief acoustic signal is generated.

The selected measuring range cannot 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.

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Activate Brief Blinks Once

Save

(stabilized

measured

value)

Reactivate

Change to

Min-Max

V, A, Hz, dB,

F, %

 

V, A, Hz, dB,

F, %



Brief See table in section 4.4.1

> 10%

r MR

0L

< 10%

r MR



= 0L

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

first

Key: MV = measured value, MR = measuring range

saved value by less than 100 digits.

Response from

Display

Digital

Is dis-

played

Stored

clearedIscleared

Instrument

DATA

Static

Blinks

Acous-

tic

Once

Tw ic e

Twi ce

Example

Note

The voltage measuring range is set manually to 3 V. The first measured value is 2.2 V and is stored to memory because it is greater than 5000 digits of the measuring range (= 0.3 V), and is thus reliably above the background noise level. As soon as the measured value drops to less than 3000 digits of the measuring range, i.e. amounts to less than 0.3 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 Saving Minimum and Maximum Values – Min/Max Function

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. Apply the measured quantity to the instrument and set the mea-

suring 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.

Function Min-Max

Activate

and save

Save and

display

Return to 1Brief

Stop Long are deleted

Press DATA /

Min-Max

2 x short 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

value, digital

Current

measured

value

Saved min.

value

Saved max.

value

Same as 1

Current

measured

Vvalue

Max.

min.

Max and min

Min. 1 x

max. 1 x

Same

as 1

deleted

Acous-

tic

Signal

2 x

1 x

2 x

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

GMC-I Messtechnik GmbH 23

Control Functions

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

4.5 Measurement Data Recording

The instrument 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 permanent memory, and are retained even after the multimeter is switched off, and after battery replacement. The system acquires measured values relative to real-time.

Stored measured values can subsequently be read out at the computer. 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 the METRAHIT ULTRA. See also section 7, “Interface Operation”.

4.5.1 Long-Term Recording

Preparing for Recording – Parameter Settings

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

parameter on page 53).

➭ Set hysteresis for efficient use of available memory space.

During memory mode operation, new measured data are only saved if they deviate from the previously stored value by an amount which exceeds the selected hysteresis value (see “hyst” parameter on page 53).

➭ Adjust “t.StorE” (see page 54) in order to limit recording dura-

tion.

➭ First select the desired measuring function and an appropriate

measuring range.

➭ Check the battery charge level before starting long-term mea-

surement recordings (see section 9.2). Connect the NA X-TRA power pack if required.

Memory Parameters Overview

Parameter Page: header

CLEAr EMpty Hyst 0CCvP rAtE StArt StoP trig tstore

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

53: HYSt – Hysteresis (parameter for memory mode operation)

25: Querying Memory Occupancy

53: rAtE – Set Transmission and Storage Rate

24: Starting Recording via Menu Functions

25: Ending Recording

54: triG – Trigger Conditions (parameters for memory mode operation)

54: tStorE – Recording Time (parameter for memory mode operation)

Starting Recording via Menu Functions

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

select the “StorE” menu.

 ...  StorE Store off StArt

1nFo

➭ Memory mode operation is started by acknowledging with

FUNC | ENTER. STORE appears in the header and indicates that the memory mode has been activated. “Store” appears at the main display. If trigger conditions are activated,

TRIG also blinks in the

header.

➭ Press the MEASURE | SETUP key in order to return to the measur-

ing function.

24 GMC-I Messtechnik GmbH

Control Functions

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

Ending Recording

➭ If the instrument is in the measuring mode, return to the menu

function by pressing the MEASURE | SETUP key. Select “StorE” again and acknowledge by pressing the FUNC | ENTER key. “StoP” blinks at the main display.

store on StoP store

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

STORE display segment in the header is cleared, indicating

The that recording has been ended.

➭ Press the MEASURE | SETUP key in order to return to the measur-

ing 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 section 6.3).

Memory occupancy range: 000.1% to 099.9%.

1nFo



bAtt 

... 

0CCvP

017.4

Clear Memory

This function deletes all measured values from memory! It’s advisable to execute this function before starting a new mea-

surement data recording.

1nFo

 ...  StorE store off StArt (blinks)



store CLEAr store CLEAr no  yes

store empty (appears briefly)  store

GMC-I Messtechnik GmbH 25

Control Functions

4.5.2 Storage of Individual Values using the SAMPLE or dAtA Sampling Rate

If only individually selected values need to be saved, SAMPLE must be selected as the StorE > rAtE sampling value. If memory mode operation is then started, a single measured value is saved to permanent memory with time stamp when the DATA/MIN/MAX key is pressed and held until two rapidly repeating acoustic signals are generated.

If dAtA is selected as the StorE > rAtE sampling rate, and if memory mode operation is then started, measured values ascertained with activated DATA function are automatically saved to permanent memory with time stamp.

26 GMC-I Messtechnik GmbH

Control Functions

GMC-I Messtechnik GmbH 27

V/Hz, , Temperature, and A/Hz Measurements

5 Measurements

5.1 Voltage Measurement

Notes Regarding Voltage Measurement

• The multimeter may only be operated with installed batteries or re-

chargeable batteries. Dangerous voltages are otherwise not indi-

cated, and the instrument may be damaged.

• The multimeter may only be operated by persons who are ca-

pable 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 gripped up to the finger guard. Do not touch the metallic test probes under any circumstances.

• Avoid working alone when taking measurements which involve

touch hazards. Be certain that a second person is present.

• For the METRAHIT ULTRA, maximum allowable voltage between the

connector sockets and ground is 600 V for measuring category III and 300 V for measuring category IV.

• Be prepared for the occurrence of unexpected voltages at de-

vices under test (e.g. defective devices). For example, capacitors may be dangerously charged.

• No measurements may be made with this instrument in electri-

cal 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 section 8, “Technical Data”, in the table entitled “Measuring Functions and Measuring Ranges” in the “Overload Capacity” column.

• 300 mV range: Thermovoltages occur in the event of temperature fluctuation, which appear as additional voltage offset. It may be necessary to repeat zero offsetting in order to achieve the specified degree of accuracy.

Scope of Functions, Voltage Measurement

Function V AC / Hz TRMS, dB (Ri 5 M)

V AC / TP-Filter 1 kHz 1) (Ri = 5 M) TRMS V AC+DC TRMS / TP-Filter (Ri =5 M) V DC (Ri = 10 M)

Pulse frequency, MHz @ 5 V TTL

Duty cycle as %

Voltage level measurement, dB @ VAC @ V

Frequency bandwidth

A 1 kHz low-pass filter can be used in this case, in order to filter out high frequency pulses of greater than 1 kHz, for example when performing measurements at pulsed motor drives.

METRAHIT ULTRA

     

AC+DC

100 kHz

28 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

V= :

300 mV600 V

> 45 V:

> 600 V:

Warnings regarding dangerous voltage:

Max. 600 V (< 5 kHz)

300 mV600 V

Max. 100 V (> 10 kHz)

max

= 3 x 106 V x Hz

Measuring Ranges:

230

for U > 100 V

Hz: 5Hz  300 kHz

1kHz

CL ip = 0FF

0020.00

230.00

TRMS

050.000

COM

V Tem p



– (+)

+ (–)

Set the CL iP parameter to 0FF in the current clamp setup menu. Otherwise all measured values are displayed in amperes, corrected by the amount resulting from the selected transformation ratio for an interconnected current clamp sensor.

1nFo  ...  SET t iME  ...  CL IP

CL Ip

➭ 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 600 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 3 V measuring range immediately after it is switched on. As soon as the MAN / AUTO key is pressed, and assuming the mea- sured value is less than 300 mV, the multimeter is switched to the mV measuring range.

GMC-I Messtechnik GmbH 29

set: 1 / 10/100/1000 / 0ff

V/Hz/dB – , Temperature, and A/Hz Measurements

V/Hz, , Temperature, and A/Hz Measurements

Attention!

V~ & Filter

CL ip = 0FF

1kHz

Reference value

Current measured value

229.20

50.0000

FUNC

ENTER

FUNC

ENTER

229.00

10.00

FUNC

ENTER

FUNC

ENTER

TRMS

229.00

050.000

FILTER

MAN

TRMS

1kHz

R:00. 775

050.000

Frequency Measurement in the V (DC+AC) Switch Position

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

measurement.

➭ Manually select the measuring range for the voltage amplitude.

➭ Repeatedly press the multifunction key FUNC | ENTER until the

unit of measure Hz appears at the display. Lowest measurable frequencies and maximum allowable voltages are listed in section 8, “Technical Data”,.

Measurement with Low-Pass Filter

A 1 kHz low-pass filter can be activate if required, in order to filter out high frequency pulses of greater than 1 kHz, for example when performing measurements at pulsed motor drives, i.e. undesired voltages of greater than 1 kHz can be suppressed.

The active low-pass filter is indicated by the FILTER display. The multimeter is automatically switched to manual measuring range selection.

Specified measuring accuracy is not reached with signals of greater than 100 Hz when the filter is active.

Be aware of the fact that dangerous voltage spikes are not 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.

30 GMC-I Messtechnik GmbH

V/Hz/dB – , Temperature, and A/Hz Measurements

Note

Attention!

5.1.2 Alternating Voltage and Frequency Measurement V AC and Hz V AC with Selectable Low-Pass Filter, V AC + FiL and dB V AC

See note in section 5.1.1.

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

turn the rotary switch to V~.

➭ Connect the measurement cables as shown.

The “” connector jack should be grounded.

Voltage Measurement

An intermittent acoustic signal warns the operator if the measured value exceeds the upper range limit in the 600 V range.

➭ You can switch back and forth between voltage measurement

with and without low-pass filter.

➭ Repeatedly press the multifunction key FUNC | ENTER until unit

of measure V in appears at the main display, and FILTER ap- pears in the header for measurement with low-pass filter.

Frequency Measurement

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

measurement.

➭ Manually select the measuring range for the voltage amplitude.

➭ Repeatedly press the multifunction key FUNC | ENTER until unit

of measure Hz appears at the display. Lowest measurable frequencies and maximum allowable voltages are listed in section 8, “Technical Data”,.

Measurements performed close to the trigger level may result in an incorrect display. If this is the case, select a smaller voltage measuring range. In the case of measured values which are much higher than the expected results, the input signal may be distorted. Perform measurement with activated 1 kHz low-pass filter in this case.

Measurement with Low-Pass Filter

Be aware of the fact that dangerous voltage spikes are not 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.

GMC-I Messtechnik GmbH 31

V/Hz, , Temperature, and A/Hz Measurements

COM

V Tem p



Max. 600 V (< 5 kHz)

V~: 300 mV  600 V

Hz: 5Hz  300 kHz

Max. 100 V (> 10 kHz)

max

= 3 x 106 V x Hz

Measuring Ranges:

> 45 V:

> 600 V:

Warnings regarding dangerous voltage:

230

for U > 100 V

V~ & Filter

1kHz

Reference value

Current measured value

229.20

50.0000

FUNC

ENTER

FUNC

ENTER

229.00

10.00

FUNC

ENTER

FUNC

ENTER

TRMS

229.00

050.000

FILTER

MAN

TRMS

1kHz

R:00. 775

050.000

The active low-pass filter is indicated by the FILTER display. The multimeter is automatically switched to manual measuring range selection.

Specified measuring accuracy is not reached with signals of greater than 100 Hz when the filter is active.

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. Where U > 45 V, a danger symbol appears at the display.

32 GMC-I Messtechnik GmbH

Alternating Voltage Level Measurement (dB)

Note

VoltageLevel dB20

------

log=

Voltage level measurement is used in order to ascertain overall attenuation or boosting of a transmission system (shown here as a 4-pole

setup)

Where U

= U

(reference level) = 0.775 V

REF

Result > 1: boosting Result < 1: attenuation

➭ Manually select the measuring range for the voltage amplitude.

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

➭ Repeatedly press the multifunction key FUNC | ENTER until unit

of measure dB appears at the display. Lowest measurable frequencies and maximum allowable voltages are listed in section 8, “Technical Data”,.

The level measurement function is now activated. The measured value is calculated based upon the RMS value of the alternating voltage component relative to the measuring range (300 mV to 600 V), and displayed.

The default value for the reference level is 0 dB = 0.775 V (1 mW to 600 ). This value is a fixed setting and is displayed at the lefthand auxiliary display (R:00.775 v).

V/Hz/dB – , Temperature, and A/Hz Measurements

No terminal resistors have been integrated into the device. It performs measurement with a high input impedance of 5M. Input impedance for voltage measurement is listed under technical data. In order to be able to perform correct measurement at nonterminated devices under test, the terminating resistor must be connected to the terminals. Be sure to take power loss at the terminating resistor into consideration!

GMC-I Messtechnik GmbH 33

V/Hz, , Temperature, and A/Hz Measurements

Attention!

Note

Duty cycle (%) =

Pulse duration (t

)

Pulse period (t

)

 100

COM

V Tem p



002

.00

MHz

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:

fp pulse frequency range

Hz t

E/tP

15 Hz to 1 kHz 2 to 98%

Up to 10 kHz 5 to 95%

015.000

kHz

Max. 5 V

01.0323

5.1.3 Frequency and Duty Cycle Measurement

➭ Set the rotary switch to MHz or %.

➭ 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 applied signal voltage may not exceed 5 V.

Frequency Measurement, MHz

A 5 V signal with a frequency of up to 1 MHz is measured and displayed using MHz as a unit of measure. The pulse frequency is the reciprocal value of the pulse period.

Duty Cycle Measurement t

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

The applied frequency must remain constant during duty cycle measurement.

34 GMC-I Messtechnik GmbH

E/tP

5.2 Resistance Measurement 

Note

COM

V Tem p



0V !



000.000



300   30 M

Measuring Ranges:

➭ 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. Interfer-

ence 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.

: “0 L” appears at the display in the case of an open connection.

V/Hz/dB – , Temperature, and A/Hz Measurements

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 35

V/Hz, , Temperature, and A/Hz Measurements

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM

V Tem p



0V !

R < 1, 10, 20 ... 300 

Open circuit voltage: < 4.5 V

000.8



0.443

FUNC

ENTER

5.3 Continuity Test with Constant Current of 1 mA

➭ 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. Interfer-

ence voltages distort measurement results!

➭ Set the rotary switch to .

➭ Connect the conductor path under test as shown.

“0 L” appears at the display in the case of an open connection. Open circuit voltage is less than 4.5 V.

Limit Value for Volume Resistance

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. The limit value can be adjusted in the “SET” menu (see also section

6.4):

1nFo  ...  SET t iME  ...  bEEP

bEEP set:1, 10, 20 ... 300  

in 10 Ohm steps

(10 = default setting)

36 GMC-I Messtechnik GmbH

5.4 Diode Testing with Constant Current of 1 mA

Note

Attention!

COM

V Tem p



Forward Direction Reverse Direction

0V !

0.654 0

Up to 4.5 V

Measuring Range:

–

0.443

000.8



FUNC

ENTER

➭ 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. Interfer-

ence 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 .

➭ Acknowledge by pressing the

➭ Connect the device under test as shown.

Forward 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 4.5 V, several series connected components or reference diodes can be tested with a small reference voltage and Z-diodes.

Reverse Direction and Interruption

The measuring instrument indicates overload: “0 L”.

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

FUNC

| ENTER

key.

V/Hz/dB – , Temperature, and A/Hz Measurements

Observe high open-circuit voltage of 6 V during diode testing: Circuits must be laid out accordingly.

GMC-I Messtechnik GmbH 37

V/Hz, , Temperature, and A/Hz Measurements

Note

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

Te mp

0023.3

°C

Temp

RTD

0256.0

°C

Pt1000

RTD

Measuring Range

TC K (NiCr-Ni) –270.0  +1372.0 C

FUNC

ENTER

1.22.4

COM

V Tem p



5.5 Temperature Measurement

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

Selecting the Unit of Measure for Temperature (°C = default value)

1nFo  ...  set t iME  ...  tempunit

unit set: °C / °F

5.5.1 Measurement with Thermocouples, Temp TC

➭ Set the rotary switch to “TempTC”.

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 key in order to change to the other measuring function.

➭ Either the internal reference junction (“1tEMPintern” parameter,

see also page 52) or an external reference temperature can be specified as the reference temperature (see page 52). The type (“I.” for internal or “E.” for external) and temperature of the selected reference junction appears at the right-hand auxiliary display during measurement.

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



FUNC | ENTER

➭ Connect the sensor to the two accessible jacks. The instru-

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

After previously performing a 10 A current measurement, the measuring instrument should be allowed to cool down for 30 minutes before performing measurements with thermocouples, in order to assure that the specified accuracy levels are achieved.

38 GMC-I Messtechnik GmbH

V/Hz/dB – , Temperature, and A/Hz Measurements

COM

V Tem p



Te mp

Temp

RTD

00.00



short leads

Entering Cable Resistance

Automatic

RTD

Compensation

Measuring Ranges

RTD Pt 100 –200,0  +850,0 C RTD Pt 1000 –150,0  + 850,0 C

FUNC

ENTER

FUNC

ENTER

ZERO

ESC

ZERO

ESC

FUNC

ENTER

00.50



0023. . 3

°C

1.22.4

0256.0

°C

Pt1000

rleadsmeas

rleadsset

5.5.2 Measurement with Resistance Sensors

➭ 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.

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.

“000.00” 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.

Entering Cable Resistance

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

sation menu.

➭ Enter the known resistance of the connector cables with the

scroll keys: Select the digit to be changes with the the respectively selected digit with the  keys. The default value is 0.43  (Z3409). Values can be selected within a range of 0 to 50 .

GMC-I Messtechnik GmbH 39

” or “Temp

”.

RTD

 

keys, and change

➭

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

FUNC | ENTER

key, the selected value is acti-

V/Hz, , Temperature, and A/Hz Measurements

Note

0V !

10.38

–



3 nF ... 3 mF

Measuring Ranges:

COM

Tem p



–

5.6 Capacitance Measurement

➭ 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.

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!

Use of the power pack may result in significant deviations during capacitance measurements!

This function is above all intended for the measurement of components. For telecommunication systems, it’s advisable to use the special capacitance measurement for measurements in symmetrical copper cable networks with the

METRAHITT-COM PLUS cable multimeter.

40 GMC-I Messtechnik GmbH

V/Hz/dB – , Temperature, and A/Hz Measurements

5.7 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 intermittent acoustic signal warns of current greater than 10 A. An continuous acoustic signal warns of current greater than 16 A

• When measuring high current values, limit them to max. 16 A for 30 seconds or 10 A for max. 5 minutes, and allow the multimeter to cool down for 10 minutes between measurements.

• For purposes of orientation, internal temperature in close proximity to the jacks is displayed at the right-hand auxiliary display in the 3 A and 10 A or 16 A ranges. If temperature rises to above 50° C, you are warned by an intermittent acoustic signal.

• 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 600 V AC/DC. Use specified fuses only! The fuse must have a breaking capacity of at least 30 kA.

• 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.

*Scope of Functions, Current Measurement, Direct Connection

Function Switch Position Measuring Range

Transformation ratio SEt menu, CliP=OFF

A DC A

A AC+DC TRMS

A AC / Hz (A AC) ~ A~

Hz (A AC+DC) /

Hz (A AC) / A AC ~ Hz

/ Hz (A AC) A

A AC+DC TRMS

300 A

3 / 30 / 300 mA

3 / 10 A (16 A)

Up to 30 kHz

Scope of Functions, Current Measurement with Current Clamp Sensor

Function Switch Position Transformation ratio SEt menu, CliPOFF

A DC V

A AC+DC / Hz (A AC) V

Hz (A AC) / A AC+DC Hz

A AC / Hz (A AC) V~

Hz (A AC) / A AC Hz

Scope of Functions, Current Measurement with Current Clamp Transformer

Function Switch Position Transformation Ratio SEt menu, CliPOFF

A DC A

A AC+DC / Hz (A AC) A

Hz (A AC) / A AC+DC A

A AC / Hz (A AC) A~

Hz (A AC) / A AC Hz

GMC-I Messtechnik GmbH 41

V/Hz, , Temperature, and A/Hz Measurements

COM mA A

I > 10 A

300 A / 3 mA 30 mA / 300 mA 3 A / 10 A (10 A max. 5 min)

8.8.8.8.8

I > 16 A

Current

Measuring Ranges:

Current measurement may only be performed with installed batteries!

Additional temperature display (internal temperature at jacks) in the 3 A and 10 A ranges

(16 A max. 30 s)

002.500

002.50

TRMS

FUNC

ENTER

24.6° C

015.000

5.7.1 Direct and Pulsating Current Measurement, Direct Connection, A DC and A (DC+AC)

➭ First disconnect supply power from the measuring circuit or

the power consumer, 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 quan-

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

➭ Safely connect the measuring instrument (without contact re-

sistance) in series to the power consumer as shown.

➭ Switch supply power to the measuring circuit back on.

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

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

➭ Disconnect supply power from the measuring circuit or the

power consumer once again, and discharge any capacitors.

➭ Remove the test probes from the measuring point and return

the measuring circuit to its normal condition.

➭ Direct frequency measurement, A (DC + AC)

ing section).

TRMS

, which is indicated

symbol.

TRMS

(see follow-

TRMS

42 GMC-I Messtechnik GmbH

5.7.2 Alternating Current and Frequency Measurement,

COM mA A

050.100

I > 10 A

I > 16 A

Current measurement may only be performed with installed batteries!

Current

FUNC

ENTER

300 A / 3 mA

3 A / 10 A (10 A max. 5 min)

Measuring Ranges:

30 mA / 300 mA

Additional temperature display (internal temperature at jacks) in the 3 A and 10 A ranges

.500

TRMS

24. 6° C

(16 A max. 30 s)

8.8.8.8.8

03.500

TRMS

24.6° C

015.000

Direct Connection, A AC and Hz

➭ First disconnect supply power from the measuring circuit or

the power consumer, 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

➭ Safely connect the measuring instrument (without contact re-

➭ Switch supply power to the measuring circuit back on.

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

➭ Disconnect supply power from the measuring circuit or the

➭ Remove the test probes from the measuring point and return

multifunction key FUNC | ENTER. Each time the key is pressed, AC knowledged with an acoustic signal.

sistance) in series to the power consumer as shown.

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

power consumer once again, and discharge any capacitors.

the measuring circuit to its normal condition.

and Hz are alternately selected, and switching is ac-

TRMS

V/Hz/dB – , Temperature, and A/Hz Measurements

GMC-I Messtechnik GmbH 43

V/Hz, , Temperature, and A/Hz Measurements

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

COM

V Tem p



Current

003.500

1:1000

Ri = 10 M5 M

003.50

1:1000

TRMS

015.000

5.7.3 Direct and Pulsating Current Measurement with Current Clamp Sensor, A DC and A (DC+AC)

Voltage/Current Transformer Output

When a current clamp 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) (see also section 6.4).

Current Clamp Setup Menu

Tra ns fo rma tion ratios:

CL IP

1:1

1mV/1mA

1:10

1mV/10mA

1:100

1mV/100mA

1:1000

1 mV/1 A

 ...  SET t iME  ...  CLIP

set:1 / 10/100/1000 / 0ff 

CLIP

DMM Measuring Ranges Clamp Types

300 mV 3 V 30 V

300.00 mA 3.0000 A 30.000 A WZ12C

3.0000 A 30.000 A 300.00 A

30.000 A 300.00 A 3000.0 A

300.00 A 3000.0 A 30000 A

WZ12B, Z201A/B METRAFLEX

Z202A/B, METRAFLEX

Z202A

, Z203A/B, WZ12C, METRAFLEX

1nFo

The maximum allowable operating voltage is equal to the nominal voltage of the current transformer.

When reading the measured value, additional error resulting from the current clamp sensor must also be taken into consideration

(default setting: 1:1000).

44 GMC-I Messtechnik GmbH

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

003.50

TRMS

1:1000

050.00

1:1000

FUNC

ENTER

COM

V Tem p



Current

Ri = 5 M

050.00

015.000

Ri = 5 M



V/Hz/dB – , Temperature, and A/Hz Measurements

5.7.4 Alternating Current Measurement with Current Clamp Sensor, A AC and Hz

Voltage/Current Transformer Output

Current Clamp Setup Menu

Cl ip 

0FF

) (see also section 6.4).

1nFo  ...  SET t iME  ...  CLIP

CLIP set:1 / 10/100/1000 / 0ff 

Tra ns fo rma tion ratios:

CL IP

1:1

1mV/1mA

1:10

1mV/10mA

1:100

1mV/100mA

1:1000

1 mV/1 A

The maximum allowable operating voltage is equal to the nominal voltage of the current transformer.

DMM Measuring Ranges Clamp Types

300 mV 3 V 30 V

300.00 mA 3.0000 A 30.000 A WZ12C

3.0000 A 30.000 A 300.00 A

30.000 A 300.00 A 3000.0 A

300.00 A 3000.0 A 30000 A

When reading the measured

WZ12B, Z201A/B METRAFLEX

Z202A/B, METRAFLEX

Z202A

, Z203A/B, WZ12C, METRAFLEX

value, additional error resulting from the current clamp sensor must also be taken into consideration

(default setting: 1:1000).

GMC-I Messtechnik GmbH 45

V/Hz, , Temperature, and A/Hz Measurements

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

1:1000

003.50

TRMS

050.100

FUNC

ENTER

003.50

COM

V Tem p



Current

1:1000

TRMS

Ri 50 m, 0,65, 5,5



0.00000

AC TRMSACTRMS

055.000

24.6° C

*Additional temperature display

(internal temperature at jacks) in the 3 A range

5.7.5 Alternating Current Measurement with Current Clamp Transformer, A AC and Hz

Current/Current Transformer Output

When a current clamp 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) (see also section 6.4).

Current Clamp Setup Menu

 ...  SET t iME  ...  CLIP

1nFo

CLIP set:1 / 10/100/1000 / 0ff 

Tra ns fo rma tion ratios:

CL IP

1:1

1mA/1mA

1:10

1mA/10mA

1:100

1mA/100mA

1:1000

1 mA/1 A

(default setting: Cl ip 0FF)

DMM Measuring Ranges Clamp Types

30 mA AC 300 mA AC 3 A AC *

30.000 mA 300.00 mA 3.0000 A

300.00 mA 3.0000 A 30.000 A

3.0000 A 30.000 A 300.00 A

30.000 A 300.00 A 3000.0 A

WZ12A, WZ12D, WZ11A, Z3511, Z3512, Z3514

46 GMC-I Messtechnik GmbH

V/Hz/dB – , Temperature, and A/Hz Measurements

GMC-I Messtechnik GmbH 47

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

6 Device and Measuring Parameters

The instrument’s “SET” 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.

➭ By repeatedly pressing the

  key (in any direction), ac-

cess is gained to the following main menus: “store”, “ send” and “set”, and the display is finally returned to“1nFo”.

➭ After selecting the desired main menu, the respective sub-

menu is accessed by pressing the FUNC | ENTER key.

➭ The desired parameter is selected by repeatedly pressing the

 key.

➭ 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

 keys.

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

➭ After pressing the ZERO | ESC key, the display is returned to the

submenu without making any changes, and by pressing the ZERO | ESC key once again, to the main menu etc.

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

pressing the MEASURE | SETUP key.

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

1nFo  ...  set  ...  t iME ... set

10:24:48 (hh:mm:ss)

 

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 acknowledg-

ment.

to change the setting rapidly.

48 GMC-I Messtechnik GmbH

Device and Measuring Parameters

bAtt: 0CCvP: dAtE

/t iME:

caldat/

uer

tEMPintern:

1nFo

SEnd

SET

StorE

StArt

StoP

000.0

CLEAr StArt/

StoP

hyst

rate

trig t

.store

Submenus / parameters 

time date addr

Com ir

irStb apoff Clip beep tempunit tempintern

beeper nofil

Main Menus 

Query Set

Set

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

1nfo

MEASURE

SETUP

020.00

TRMS

Acknowledge

FUNC

ENTER

Acknowledge

FUNC

ENTER

Acknowledge

FUNC

ENTER

Com bt bt pin

M248B:

6.1 Paths to the Various Parameters 6.2 List of All Parameters

GMC-I Messtechnik GmbH 49

Parameter

Addr APoFF bAtt 50: bAtt – Query Battery Voltage bEEP 52: bEEP – Set Limit Value for Continuity Testing beeper on/off bt pin caldat 50: cALdAt – Query Calibration Date CLEAr CLiP 44: Direct and Pulsating Current Measurement with Current Clamp Sen-

Com bt 57: Interface Selection for METRA HIT ULTRA BT (M248B) CoM ir 57: Interface Selection for METRA HIT ULTRA BT (M248B) dAtE 50: dAtE – Query Date, 51: dAtE – Enter Date EMpty hyst 1nfo 50: Querying Parameters – InFo Menu irStb 1tEMP 50: ItEMP intErn – Query Reference Temperature nofil 0CCvP rAtE SEnd 56: Activating the Interface SET 51: Entering Parameters – SETUP Menu StArt StoP store temp intern 50: ItEMP intErn – Query Reference Temperature temp unit 52: tEMP unit – Select a Unit of Measure for Temperature t iME 50: tiME – Query Time, 51: tiME – Set Time trig 54: triG – Trigger Conditions (parameters for memory mode operation) tstore 54: tStorE – Recording Time (parameter for memory mode operation) uEr

Page: Header

57: Configuring Interface Parameters 51: APoFF – Specified Time for Automatic Shutdown and Continuous ON

52: bEEPEr on/oFF – Activate/Deactivate Acoustic Signals 57: bt Pin – Allocating the pin for the Bluetooth interface (M248B)

24: Measurement Data Recording

sor, A DC and A (DC+AC)

24: Measurement Data Recording 53: HYSt – Hysteresis (parameter for memory mode operation)

57: Configuring Interface Parameters

52: noFiL– quick display of measured values (as from firmwareversion 1.23) 24: Measurement Data Recording 53: rAtE

–

Set Transmission and Storage Rate

24: Measurement Data Recording

50: 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

MEASURE

SETUP

FUNC

ENTER

6.3 Querying Parameters – InFo Menu

bAtt – Query Battery Voltage

1nFo bAtt 2.9 V.

OCCUP – Query Memory Occupancy

1nFo

bAtt 

... 

0CCvP 000.0

dAtE – Query Date

1nFo bAtt



...  20.06.

2012 (DD.MM. YY)

D = day, M = month, Y = year

Date and time must be reentered after replacing the batteries.

tiME – Query Time

1nFo

bAtt 

...  13:46:56

h = hours, m = minutes, s = seconds

(hh:mm:ss)

Date and time must be reentered after replacing the batteries.

cALdAt – Query Calibration Date

1nFo bAtt



...  caldat 20.06.12

vErSion – Query Firmware Version

1nFo bAtt



...  VEr 0.22

ItEMP intErn – 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  ... 

tEMP intern 24,7

°C

50 GMC-I Messtechnik GmbH

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

6.4 Entering Parameters – SETUP Menu

tiME – Set Time

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

1nFo

 ...  SET t iME

t iME SET: 10:24:18 (hh:mm:ss)

 

Date and time must be reentered after replacing the batteries.

dAtE – Enter Date

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

 ...  SET t iME  ...  dAtE

1nFo

datE SET: 20.06 (DD: day . MM: month)

 

year SET: 2012 (YYYY: year)

 

irStb – Status of the Infrared Receiver in the Stand-By Mode

See section 7.2 on page 57 regarding settings.

CoM ir / CoM bt – Interface Operating System Infrared / Bluetooth

Refer to section 7.2 on page 57 for instructions on switching between the two systems.

bt pin – Pin for Bluetooth Interface

Refer to section 7.2 on page 57 on setting instructions.

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 to continuous operation 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 canceled by changing the respective parameter, or by switching the instrument off manually. In this case, the parameter is reset to 10 minutes.

1nFo  ...  SET t iME  ...  APoFF

Date and time must be reentered after replacing the batteries.

Addr – Set Device Address

APoFF SET: 10 ... 59 min on

(10 minutes = default setting)



See section 7.2 on page 57.

GMC-I Messtechnik GmbH 51

Device and Measuring Parameters

Note

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

The auto power off function (APoFF parameter) is deactivated when dangerous touch voltage is applied.

CLiP – Set Transformation Ratio (current clamp factor)

See section 5.7.3 ff.

bEEP – Set Limit Value for Continuity Testing

1nFo

 ...  SET t iME  ...  bEEP

bEEP SET: 1, 10, 20 ... 500  

(10  = default setting)

tEMP unit – Select a Unit of Measure for Temperature

1nFo

 ...  SET t iME  ...  temp unit °C

unit SET: °C / °F 

(°C = default setting)

52 GMC-I Messtechnik GmbH

Device and Measuring Parameters

Note

MEASURE

SETUP

FUNC

ENTER

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

tEMP intErn/ExtErn – Select Internal or External Reference Junction

External Reference Junction: Specified Temperature

 ...  SET t iME  ...  tEMP intern

1nFo

tEMP set: tEMP intern / tempextern

extern set: 000 . 0 °C



(internal reference = default setting)

bEEPEr on/oFF – Activate/Deactivate Acoustic Signals

1nFo

 ...  SET t iME  ...  beeper off

beeper set: on / off

(bEEPEr on = default setting)



noFiL– quick display of measured values (as from firmwareversion 1.23)

For the following functions, a quicker display update rate of up to 5 display values per second (noFiL=ON) instead of 2 display values per second (noFiL=OFF) can be set: A DC direct,



, diode measurement.

1nFo



... 

SET rAtE  ...  nofil

V DC, A DC with clamp,

6.5 StorE Menu – Parameter for Memory Mode Operation

HYSt – Hysteresis (parameter for memory mode operation)

The hysteresis setting allows for efficient use of memory space. During memory mode operation, new measured data are only saved if they deviate from the previously stored value by an amount which exceeds the selected hysteresis value.

Hysteresis can be selected in steps from 1 to 10,000 digits. These digits are related to the measuring range as follows: The position of the set digit in the specified hysteresis value corresponds to the same position within the measuring range, although counting is started at the left.

Example: A specified hysteresis of 00100 for the 600.00 V measuring range means that only those measured values which deviate from the last measured value by more than 001.00 V are saved to memory.

Due to the fact that the value is specified in digits (highest place all the way to the left), and thus depends on the measuring range, it’s advisable to use the function with a fixed measuring range only.

1nFo  ...  store  ...  hyst

hyst set: 00000 ... 10000

 

on / 0ff

(OFF =

Standard value*/default setting)

* All specifications refer to the default update rate with measuring param-

eter noFiL = OFF (default).

GMC-I Messtechnik GmbH 53

Device and Measuring Parameters

MEASURE

SETUP

FUNC

ENTER

FUNC

ENTER

FUNC

ENTER

rAtE – Set Transmission and Storage 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. [h:mm:ss.

0: 0:

] 00:00.1, 00:00.2, 00:00.5, 00:01.0, 00:02.0, 00:05.0

] (h = hours, m = minutes, s = sec.,