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

Operating Instructions
METRAHITULTRA and METRAHITULTRA BT
High Resolution TRMS Digital Multimeter
3-349-684-03
9/5.17
Scope of Delivery Contact Persons
Scope of Delivery
* Detailed operating instructions are available for download on the Internet
at www.gossenmetrawatt.com
Included Functions
Function METRAHIT ULTRA /
Voltage, V
(Ri 10 M)
DC
Voltage, VAC TRMS (Ri 5 M)
Voltage, V
Frequency, Hz @ VAC @ V
TRMS (Ri 5 M)
AC+DC
AC+DC
1 kHz low-pass filter @ V
Bandwidth @ V
AC+DC
or V
AC
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,
I
= 1 mA
CONST
Temp. measurement C/F @ T Temp. measurement C/F R
TD
Capacitance measurement, F
METRAHIT ULTRA BT
C
M248A / M248B
Up to 300 kHz
@ V
AC
AC+DC
100 kHz
2.0% to 98%
@ V
AC
AC+DC
Typ e K
Pt100/Pt1000
Function METRAHIT ULTRA /
METRAHIT ULTRA BT
M248A / M248B
Current, A
Current, A
Current, A
Bandwidth @ A
Frequency, Hz @ A
Current clamp measurement with ad­justable transformation ratio
Data logger function
Relative value measurement
DC
AC+DC
TRMS
AC
TRMS
or A
AC+DC
AC
@ V
AC
AC+DC
1
(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
1
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
See also section 10 on page 70.
Product Support
Technical Queries (use, operation, software registration)
If required please contact:
GMC-I Messtechnik GmbH
Product Support Hotline
Phone: +49 911 8602-0 Fax: +49 911 8602-709 e-mail: support@gossenmetrawatt.com
Software Enabling for METRAwin10 (as of version 6.xx)
GMC-I Messtechnik GmbH
Front Office
Phone: +49 911 8602-111 Fax: +49 911 8602-777 e-mail: info@gossenmetrawatt.com
GMC-I Messtechnik GmbH 3
Scope of Delivery Contact Persons
Recalibration Service
Our service center calibrates and recalibrates all instruments sup­plied by GMC-I Messtechnik GmbH, as well as other manufactur­ers, (for example after one year as part of your test equipment monitoring system, and prior to use etc.) and offers free test equipment management.
Repair and Replacement Parts Service Calibration Center* and Rental Instrument Service
If required please contact:
GMC-I Service GmbH Service Center Thomas-Mann-Str. 20 90471 Nürnberg, Germany Phone: +49 911 817718-0 Fax: +49 911 817718-253 e-mail: service@gossenmetrawatt.com www.gmci-service.com
This address is only valid in Germany. Please contact our repre­sentatives or subsidiaries for service in other countries.
* DAkkS calibration laboratory for measured electrical quantities,
D-K-15080-01-01, accredited in accordance with DIN EN ISO/IEC 17025
Accredited quantities: direct voltage, direct current value, direct current resistance, alternating voltage, alternating current value, AC active power, AC apparent power, DC power, capacitance, frequency, tem­perature
Competent Partner
GMC-I Messtechnik GmbH is certified in accordance with DIN EN ISO 9001.
Our DAkkS calibration laboratory is accredited by the Deutsche Akkreditierungsstelle GmbH (national accreditation body for the Federal Republic of Germany) under registration number D-K­15080-01-01 in accordance with DIN EN ISO/IEC 17025.
We offer a complete range of expertise in the field of metrology: from test reports and factory calibration certificates right on up to DAkkS calibration certificates.
Our spectrum of offerings is rounded out with free test equipment management.
As a full service calibration laboratory, we can calibrate instru­ments from other manufacturers as well.
4 GMC-I Messtechnik GmbH
Contact Persons
GMC-I Messtechnik GmbH 5
Table of Contents
Content Page Content Page
1 Safety Features and Precautions ....................................... 8
1.1 Use for Intended Purpose ................................................................10
1.2 Meanings of Danger Symbols ..........................................................11
1.3 Meanings of Acoustic Warning Signals ............................................11
2
Operating Overview – Connections, Keys, Rotary Switch, Symbols
............................................................................ 12
3 Initial Start-Up .................................................................. 16
3.1 Inserting Batteries or Rechargeable Batteries ...................................16
3.2 Switching the Instrument On ...........................................................16
3.3 Setting the Operating Parameters ....................................................16
3.4 Switching the Instrument Off ...........................................................17
4 Control Functions ............................................................. 18
4.1 Selecting Measuring Functions and Measuring Ranges .....................18
4.1.1 Automatic Range Selection .............................................................18
4.1.2 Manual Measuring Range Selection .................................................19
4.1.3 Quick Measurements ......................................................................20
4.2 Zero Offset / Relative Measurements ...............................................20
4.3 Display (LCD) .................................................................................21
4.4 Measured Value Storage: DATA (auto-hold / compare) ......................22
4.4.1 Saving Minimum and Maximum Values – Min/Max Function .............23
4.5 Measurement Data Recording .........................................................24
4.5.1 Long-Term Recording .....................................................................24
Storage of Individual Values using the SAMPLE or dAtA Sampling Rate ......... 26
4.5.2
5 Measurements ................................................................. 28
5.1 Voltage Measurement ....................................................................28
5.1.1 Direct and Pulsating Voltage Measurement, V DC and V (DC+AC) .....29
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 .........31
5.1.3 Frequency and Duty Cycle Measurement .........................................34
5.2 Resistance Measurement 
5.3 Continuity Test with Constant Current of 1 mA ................................ 36
5.4 Diode Testing with Constant Current of 1 mA ..................................37
5.5 Temperature Measurement ............................................................38
5.5.1 Measurement with Thermocouples, Temp TC ..................................38
5.5.2 Measurement with Resistance Sensors ...........................................39
5.6 Capacitance Measurement ............................................................40
5.7 Current Measurement ....................................................................41
5.7.1 Direct and Pulsating Current Measurement, Direct Connection,
A DC and A (DC+AC) ......................................................................42
5.7.2 Alternating Current and Frequency Measurement,
Direct Connection, A AC and Hz ......................................................43
5.7.3 Direct and Pulsating Current Measurement with Current Clamp Sensor, A
DC and A (DC+AC) .........................................................................44
5.7.4 Alternating Current Measurement with Current Clamp Sensor,
A AC and Hz ..................................................................................45
5.7.5 Alternating Current Measurement with Current Clamp Transformer,
A AC and Hz ..................................................................................46
6 GMC-I Messtechnik GmbH
Table of Contents
Content Page Content Page
6 Device and Measuring Parameters ................................... 48
6.1 Paths to the Various Parameters .................................................... 49
6.2 List of All Parameters .................................................................... 49
6.3 Querying Parameters – InFo Menu .................................................. 50
6.4 Entering Parameters – SETUP Menu ............................................... 51
6.5 StorE Menu – Parameter for Memory Mode Operation .....................53
6.6 Default Settings ............................................................................. 55
7 Interface Operation ...........................................................56
7.1 Activating the Interface ...................................................................56
7.2 Configuring Interface Parameters .................................................... 57
8 Technical Data ..................................................................58
9 Maintenance and Calibration ............................................ 66
9.1 Displays – Error Messages ............................................................ 66
9.2 Batteries .......................................................................................66
9.3 Fuse .............................................................................................67
9.4 Housing Maintenance ....................................................................68
9.5 Return and Environmentally Sound Disposal .................................... 68
9.6 Recalibration .................................................................................69
9.7 Manufacturer’s Guarantee .............................................................. 69
10 Accessories .......................................................................70
10.1 General ......................................................................................... 70
10.2 Technical Data for Measurement Cables
(scope of delivery: KS17-2 safety cable set) .................................... 70
10.3 NA X-TRA Power Pack (not included) .............................................. 70
10.4 Interface Accessories (not included) ................................................ 71
10.4.1 Infrared Interface ........................................................................... 71
10.4.2 Bluetooth Interface ........................................................................ 71
11 Index .................................................................................72
GMC-I Messtechnik GmbH 7
Safety Precautions

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:
I
e.g. electrical systems in motor vehicles and aircraft, batteries etc.
Measurements in electrical circuits which are electrically connected to the low-
II
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:
IV
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.
8 GMC-I Messtechnik GmbH
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.
GMC-I Messtechnik GmbH 9
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).
10 GMC-I Messtechnik GmbH
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

1
3
4
16
5
6
9
*
section 4.3
section 3 section 5
section 7
section 6
section 3 ff.
section 3
13
12
section 4.1
10
2
section 4.1
14
8
Max. 600 V!
11
15
section 4.1
section 4.4
section 6
section 3
section 6
section 3.1
7
section 1.2
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:
3
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
12 GMC-I Messtechnik GmbH
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
8
13
14
16
4 5
7
3
10
12
9
18
23 262019
17
15
24
11
21 22 25 27 28 29
7
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
15
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
GMC-I Messtechnik GmbH 13
Operating Overview – Connections, Keys, Rotary Switch, Symbols
1kHz
V
AC DC+
V
AC
2
V
DC
2
+=
A
AAA
A
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 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
1
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
1
A DC +AC TRMS Hz
2
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
14 GMC-I Messtechnik GmbH
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.
16 GMC-I Messtechnik GmbH
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 1C 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
V
050.00
AC
TRMS
Hz
U > 45 V:
V~
V
V
Te mp
TC
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 310,000 28,000
V , V , A , A 31,000 2800
3 nF ... 3 mF 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

mF
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)
or
•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
GMC-I Messtechnik GmbH 21
Control Functions
Note
V, A , Hz
t [s]
300000
30000
Activated
Reactivated
Save
Save
of Measuring Range
D
D
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.
22 GMC-I Messtechnik GmbH
Activate Brief Blinks Once
Save
(stabilized
measured
value)
Reactivate
Change to
Min-Max
V, A, Hz, dB,
F, %

V, A, Hz, dB,
1)
F, %

Brief See table in section 4.4.1
> 10%
r MR
0L
< 10%
r MR
= 0L
Exit Long
1
Reactivation results from falling short of specified measured value limits.
2
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
MV
Digital
Is dis-
played
Stored
MV
Is
clearedIscleared
Instrument
DATA
Static
Blinks
Acous-
tic
Once
Tw ic e
Twi ce
2
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
1
2 x short are saved
m
Brief
2
Brief
3
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
is
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
1
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.
1
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
Note
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
V= :
300 mV600 V
V
> 45 V:
> 600 V:
Warnings regarding dangerous voltage:
Max. 600 V (< 5 kHz)
V:
300 mV600 V
Max. 100 V (> 10 kHz)
P
max
= 3 x 106 V x Hz
Measuring Ranges:
230
.0
for U > 100 V
Hz: 5Hz 300 kHz
V
1kHz
dB
CL ip = 0FF
!
CL ip = 0FF
!
0020.00
V
DC
V
230.00
V
DC
AC
TRMS
V
050.000
Hz
Hz
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
!
V
1kHz
dB
Reference value
Current measured value
V
229.20
V
229.20
V
Hz
50.0000
Hz
FUNC
ENTER
FUNC
ENTER
229.00
V
10.00
dB
dB
FUNC
ENTER
FUNC
ENTER
DC
AC
TRMS
DC
AC
TRMS
229.00
V
050.000
Hz
FILTER
MAN
DC
AC
TRMS
1kHz
V~
R:00. 775
V
050.000
Hz
V
Hz
Hz
V
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
Note
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.
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 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.
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.
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)
P
max
= 3 x 106 V x Hz
Measuring Ranges:
> 45 V:
> 600 V:
Warnings regarding dangerous voltage:
230
.0
for U > 100 V
V~
V~ & Filter
!
1kHz
dB
Reference value
Current measured value
V~
229.20
V
229.20
V
Hz
50.0000
Hz
FUNC
ENTER
FUNC
ENTER
229.00
V
10.00
dB
dB
FUNC
ENTER
FUNC
ENTER
AC
TRMS
AC
TRMS
229.00
V
050.000
Hz
FILTER
MAN
AC
TRMS
1kHz
V~
R:00. 775
V
050.000
Hz
Hz
V
Hz
V
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
U
1
U
2
VoltageLevel dB20
U
2
U
1
------
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
1
= 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
E
)
Pulse period (t
P
)
100
COM
V Tem p
002
.00
%
MHz
%
MHz
%
U
t
t
E
t
P
tE/t
P
Pulse Time Quantities
f
P
pulse frequency = 1/tP
t
E
pulse duration
t
P
pulse period
t
P
– tEinterpulse period
t
E/tP
pulse or duty cycle
f
P
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
Hz
kHz
Max. 5 V
!
Hz
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
R
x
R
x
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
V
DC
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
.
L
Up to 4.5 V
Measuring Range:
+
0.443
V
!
000.8
DC
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
Note
Note
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
Te mp
TC
0023.3
°C
Temp
RTD
TC
TC
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
TC

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
TC
Temp
RTD
TC
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
TC
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
TC
”.
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
Note
Note
0V !
!
10.38
F
+
3 nF ... 3 mF
Measuring Ranges:
COM
V
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
METRAHITT-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, “FUSEappears 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 section 8, “Technical Data”, in the table entitled “Measuring Functions and Measuring Ranges” in the “Over­load Capacity” column.
*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
A
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
~
R
x
~
R
x
1
3
2
I > 10 A
!
A
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
A
DC
002.50
A
DC
AC
TRMS
A
A
FUNC
ENTER
24.6° C
*
24.6° C
*
015.000
Hz
Hz

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
~
R
x
~
R
x
1
3
2
A~
Hz
A~
Hz
050.100
Hz
AC
!
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
03
.500
A
TRMS
24. 6° C
*
Hz
A
(16 A max. 30 s)
8.8.8.8.8
03.500
A
AC
TRMS
24.6° C
*
015.000
Hz
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
A
~
R
x
Current
003.500
A
1:1000
A
DC
A
Ri
Ri = 10 M5 M
mA
V
V
Hz
003.50
A
1:1000
DC
AC
TRMS
015.000
Hz

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
/B
, 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
A
AC
TRMS
A~
Hz
1:1000
050.00
Hz
AC
1:1000
FUNC
ENTER
COM
V Tem p
A
~
R
x
Current
Ri
Ri = 5 M
mA
050.00
A
015.000
Hz
V~
Hz
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
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 (
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
/B
, 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
1:1000
A~
Hz
A~
003.50
A
AC
TRMS
050.100
Hz
FUNC
ENTER
003.50
COM
V Tem p
A
~
R
x
Current
R
i
mA
1:1000
1:1000
A~
Hz
A~
Hz
A
AC
TRMS
Ri 50 m, 0,65, 5,5
0.00000
A
AC TRMSACTRMS
055.000
Hz
24.6° C
*
24.6° C
*
Hz
A
*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
Set
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
1nfo
MEASURE
SETUP
020.00
V
DC
AC
TRMS
Acknowledge
FUNC
ENTER
Acknowledge
FUNC
ENTER
Acknowledge
FUNC
ENTER
Com bt bt pin
M248B:
IR

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:
0
[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
0
] (h = hours, m = minutes, s = sec.,
00:10
, 0:
00:20
, 0:
00:30
, 0:
00:40
, 0:
00:50
, 0:
01:00
10:00
, 0:
20:00
, 0:
30:00
, 0:
40:00
, 0:
50:00, 01:00:00, 02:00:00, 03:00:00
0 = tenths of a sec.
, 0:
02:00
, 0:
05:00
,
,
04:00:00, 05:00:00, 06:00:00, 07:00:00, 08:00:00, 09:00:00, SAMPLE, dAtA
(boldface: values or digits which are actually displayed,
plain: placeholders for unit)
Setting the Sampling Rate
1nFo ... store  ...  rAtE
rAtE set: 00:00.1 ... 00:00.5 ... 9:00:00 sample data

(00:00.5 = 0.5 s = default value)
The last selected value is retained, even after switching the instru­ment off.
If the selected sampling rate is too short for the measuring function, the smallest valid sampling rate is used automatically.
If a sampling rate is selected which is greater than auto power off time (see APoFF parameter on page 51), the instrument is switched off automatically after auto power off time has elapsed, and back on again roughly 10 seconds before the next measuring point.
Storage of Individual Values using the SAMPLE or dAtA Sampling Rate
If only manually 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 mem-
)
ory mode operation is then started, measured values ascertained with activated DATA function are automatically saved to perma­nent memory with time stamp.
triG – Trigger Conditions (parameters for memory mode operation)
The StorE > triG SEt = Sto-ou / Sto-in / OFF setting can be used to specify how measured value recording is started and stopped:
triG = off: Recording is started with Store > Start and ended with Store > Stop.
triG = sto-ou: Recording is started as soon as a measured value occurs which is outside of the selected measuring limits, and is stopped as soon as the measuring limits are once again com­plied with, or the selected recording period has elapsed.
triG = sto-in: Recording is started as soon as a measured value occurs which is within a specified band, and is stopped as soon as this is no longer the case, or after the maximum re­cording period has elapsed.
The band is specified with the help of the L_triG lower limit and the H_triG upper limit. Querying takes place in the event that triG OFF is selected. Bandwidths are specified in digits and de­fined by the measuring range limit, which, in the case of DC for example, corresponds to 300,000 (–300,000 to +300 ,000). In measuring functions with a small measuring range span (e.g.
54 GMC-I Messtechnik GmbH
Device and Measuring Parameters
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
ZERO
ESC
ON / OFF
LIGHT
V AC with 30,000 digits), it is not useful to set the trigger thresh­old above this measuring range span. It’s thus advisable to per­form measurement with a fixed measuring range. Due to the fact that rapid momentary value acquisition (see section 4.5.1) has a large measuring range span, limit values of greater than 30,000 digits can be selected.
Actual measurement is always executed using the sampling rate selected in “Store > rAtE”.
 ...  store  ...  trig
1nFo
trig set : sto-ou / sto-in / off
l_trig set : -150000 ... +150000


h_trig set : -150000 ... +150000 
tStorE – Recording Time (parameter for memory mode operation)
This parameter determines whether or not measured values will be recorded for a limited time only. If recording time will be limited, its duration can be entered in hours, minutes and seconds. “On” means unlimited recording time.
 ...  store  ...  t .store
1nFo

6.6 Default Settings

Previously entered changes can be undone, and default settings can be restored. This may be advisable under the following cir­cumstances:
• After the occurrence of software or hardware errors
• If you are under the impression that the multimeter does not work correctly
Disconnect the device from the measuring circuit.
Remove the batteries temporarily (see also section 9.2).
Simultaneously press and hold the and
keys and reinsert the batteries at the same time, which is acknowledged with two acoustic signals.
t .store set : on /99:00:00 (hh:mm:ss)

After completion of the recording time t.StorE, the end of the stor­age process is signalled by 2 short acoustic signals (as from firm­ware version V1.14).
GMC-I Messtechnik GmbH 55
Interface Operation
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER

7 Interface Operation

The multimeters are 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 connection to the PC with an interface cable. Model METRAHIT ULTRA BT (M248B) optionally allows for the wire- less data transfer via Bluetooth to a PC, smartphone or tablet PC (based on Android operating system). Information on the smart­phone app METRALOG is available in section 10.4.2. Commands and parameters can be transmitted from the PC to the multimeter in both interface operating systems as well. The following functions can be executed:
• Configure and read out measuring parameters
• Select a measuring function and a measuring range
• 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 “1rStb” parameter has been set to “ir on” (see section 7.2), or the instrument is already switched on (the first command wakes up the multimeter, but does not yet execute any further commands). To activate the Bluetooth interface, set parameter „COM ir “ to „COM bt “ and allocate an access key (pin) via „bt pin “, see section
7.2. The Bluetooth interface is inactive when the multimeter is switched off.
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
1nFo
send /
IR interface: IR and an arrow pointing to the right blink during trans- mission mode operation.
Bluetooth interface: During radio communication to the PC or smartphone, symbol and the two cursors are flashing.
Stopping Continuous Transmission Operation with Menu Functions
 ...  SEnd send /
1nFo
stop send
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.
56 GMC-I Messtechnik GmbH
Interface Operation
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
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER

7.2 Configuring Interface Parameters

1rStb – 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 (refers to METRAHIT ULTRA (M248A) and METRAHIT ULTRA BT (M248B), if Com ir has been set):
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 t iME  ...  irStb
1nFo
ir on / ir oFF

(irstb = ir on = default setting, irstb = ir oFF = status upon delivery)
Interface Selection for METRAHIT ULTRA BT (M248B)
Com ir Symbol IR for infrared is shown in the display, the infra-
red interface is selected and is either active or not active, depending on the parameter setting for irstb, see above. The Bluetooth interface is deactivated.
Com bt Symbol for Bluetooth is shown in the display, the
Bluetooth interface is active. The infrared interface is deactivated.
Switching from IR to Bluetooth:
 ...  SET t iME  ...  Comir
1nFo
Com Set ir (flashes)
 bt Com bt
Switching from Bluetooth to IR:
1nFo ... SET t iME ... Combt
Com Set bt (flashes)
 ir Com ir IR
bt Pin – Allocating the pin for the Bluetooth interface
The pin entered at the multimeter must correspond to the pin at the PC or smartphone.
 ...  SET t iME  ...  bt Pin
1nFo
bt Pin Set 0000 ... 9999 (blinkt) 
Addr – Multimeter 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 t iME ... Addr
00 ... 01 ... 15 
(15 = default setting)
GMC-I Messtechnik GmbH 57
Technical Data

8 Technical Data

Resolution at Upper Range
Meas.
Function
Measuring Range
309,999 30,999 3099 ~ / ~
300 mV 1 V10V 10 M > 5 M // < 50 pF
3V 10V 100 V 10 M > 5 M // < 50 pF 0.02 + 0.005+ 5
V
30 V 100 V1mV 10 M > 5 M// < 50 pF 0.02 + 0.005 + 5 300 V 1mV 10mV 10 M > 5 M// < 50 pF 0.02 + 0.005 + 5 600 V 10 mV 100 mV 10 M > 5 M// < 50 pF 0.02 + 0.005 + 5
0.3 V / 3 V ... 600 V~ 0.01 dB - 42 dB ... + 57 dB
dB
300 A 1 nA 10 nA 170 mV 0.05 + 0.02 + 5 with ZERO
3 mA 10 nA 100 nA 170 mV 0.05 + 0.01 + 5
A
30 mA 100 nA 1 A 170 mV 0.02 + 0.01 + 5
300 mA 1 A10A 200 mV 0.1 + 0.05 + 5
3A 10A 100 A 150 mV 0.2 + 0.05 + 5 with ZERO 0.7 + 30 0.7 + 30
10 A 100 A 1 mA 470 mV 0.2 + 0.05 + 5 0.5 + 30 0.5 + 30
Factor: 1:1/10/100/1000
0.03, 0.3, 3, 30 A 30 mA
A
0.3, 3, 30, 300 A 300 mA 0.7 A cont. 3/30/300/3000 A
A
0.3, 3, 30, 300 A
3/30/300/3000 A
300 1m < 2 V Approx. 0.5 mA
3k 10 m < 2 V Approx. 130 A 0.05 + 0.01 + 5
30 k 100 m < 2 V Approx. 20 A 0.05 + 0.01 + 5
300 k 1  < 2 V Approx. 2 A 0.05 + 0.01 + 5
3M 10  < 2 V Approx. 1 A 0.1 + 0.02 + 5
30 M 100 < 2 V Approx. 200 nA 1 + 0.2 + 5
300 —0.1 < 4.5 V Approx. 1 mA const. 1 + 5
4,5 V 3— 1 mV < 6 V Approx. 1 mA const. 0.2 + 3 600 V
Limit
DC AC/AC+DC
Display Range for Reference Voltage
DC AC/AC+DC
Voltage drop at approx. range limit ~
Input Input impedance
3 A Plus current transformer clamp error
300 mV 3V / 30V
Voltage measurement input (V jack) Ri =5 M
Open-circuit
Input impedance
U
REF = 0.775 V
Current measurement input
( Asocket)
/10 M
voltage
Measuring current at range limit
Intrinsic Uncertainty under Reference Conditions
(...% rdg + % MR +... d) (... % rdg + ... d)(... % rdg + ... d)
0.02 + 0.005 + 10 with ZERO
0.5 + 30
0.2 + 30
Intrinsic
Uncertainty
2
0.5 + 30
1
0.5 + 30 Cont.
0.1 dB (U > 10% MR)
2
0.5 + 30 0.5 + 30 0.7 A Cont.
See current measuring ranges for specification.
See voltage measuring ranges for specification.
(... % rdg. + % MR ... d)
0.05 + 0.01 + 5 with ZERO with ZERO
with ZERO
2
2
Overload
12
Capacity
Value Time
Max. 10 sec.
600V
DC AC
RMS
sine
600 V
AC RMS
10 A:  5 min.
sine
16 A: 30 s
Cont.
Measurement input
3A: 5 min.
Measurement input
600 V TRMS
600 V
DC
Max. 10 sec.
AC
(PTC)
RMS
sine
600 V
Max. 10 sec. Max. 10 sec.
10, 11
11
58 GMC-I Messtechnik GmbH
Technical Data
Meas.
Function
Measuring Range
Resolution at Upper Range Limit
309,999 30,999 3099 Value Time
Discharge resistance
Conditions
3nF 1pF 1M 2 V 2 + 15 with ZERO function active
30 nF 10 pF 1 M 2 V 1 + 6 with ZERO function active
300 nF 100 pF 100 k 2V
F
30 F— — 10nF 10k 2V
300 F 100 nF
3mF 1μF 2 V
Hz (V)
Hz (A)
Hz (A )
Hz (V)
MHz
%
C/F
1
Specified accuracy valid as of 1% of the measuring range
2
Specified accuracy valid as of 2% of the measuring range
3
Display of up to max. 4.5 V, above which overload display appears: “OL”
4
Applies to measurements at film capacitors during battery operation
5
Lowest measurable frequency for sinusoidal measuring signals symmetrical to the zero point
6
Overload capacity of the voltage measurement input: power limiting: frequency x voltage max. 3 x 10
300 Hz 0.001 Hz
3 kHz 0.01 Hz
30 kHz 0.1 Hz
300 kHz 1 Hz 10 Hz
300 Hz to 1 MHz
0.01...100 Hz
2.00 ... 98.00% 0.01 % 15 Hz ... 1 kHz 0.1 MR 
5.00 ... 95.00% 0.01% 1 ... 10 kHz
- 200.0 ... +100.0 C
Pt100
Pt1000
K
(NiCr-Ni)
+ 100.0 ...
+850.0 C
- 270.0 ...
+1372.0C
0.1 K
6
V x Hz for U > 100 V
2.5 k
Intrinsic Uncertainty under Reference Conditions
U
0 max
(... % rdg. + ... d)
4
600 V
1 + 63 F 1 nF 100 k 2V
2V
5
f
min
5Hz
5 + 6
(... % rdg. + ... d)
Hz(V) 0.05 + 2 Hz(A) 0.05 + 3
8
8
Hz (V) 6:
Hz(A
600 V
Hz (A):
1 Hz > 3 V ... 5 V
10 d > 3 V ... 5 V
0.1 MR per kHz  10 d
> 3 V ... 5 V
600 V
600 V
(... % rdg. + ... d)
9
0.3 + 10
1% + 2.0 K
7
Overload capacity of the current measurement input: see current measuring ranges for max. current values
8
Input sensitivity, sinusoidal signal: 10% to100% of voltage/current in the 300 kHz range the specified intrinsic uncertainty applies as from 15% of MR
9
Plus sensor deviation
10
As of a measured value of 7 A, measurement is limited to an ambient temperature of 30 C or a maximum duration of 5 minutes.
11
Off-time > 30 min. and TA 40 C after a 10 or 16 A measurement
12
At 0  ... + 40 C
9
600 V
DC/AC
measuring range
Key: d = digit(s), MR = measuring range, rdg. = reading (measured value)
Overload
Capacity
DC
AC RMS sine
6
7
RMS sine
12
Max. 10 s
Max. 10 s
Max. 10 s
Max. 10 s
Max. 10 s
;
GMC-I Messtechnik GmbH 59
Technical Data
Influencing Quantities and Influence Error
Influencing
Quantity
Tem p er at ur e
1
With zero balancing
2
Prerequisite: stable ambient temperature (t > 30 min.)
Influencing
Quantity
DATA V A, , Hz, dB, C 10 d MIN / MAX V A, , Hz, dB, C 30 d
Sphere of
Influence
0C ... +21C
and
+25C... +40C
Measured Quantity
Measured Quantity /
Measuring Range
V 0.05 + 5
V , V , dB 0.2 + 10
300 ... 30 M, 0.1 + 10
A , A , A 0.3 + 10
30 nF, 300 nF, 3 F, 30 F 0.5 + 10
3 nF, 300 F3 + 10
Hz 0.05 + 5
C/F (Pt100/Pt1000) 0.1 + 10
C/F thermocouple K
Influence Error
(...% rdg. + ... d)
1
(...% rdg. + ... d) / 10 K
2
Influence Error
0.1 + 5
0.1 + 10
Influencing
Quantity
Measured Quantity /
Measuring Range
Sphere of Influence
Intrinsic Uncertainty

... % rdg. + ... d)
> 15 Hz ... 45 Hz 2 + 30
300.00 mV ...
30.000 V
V
AC
V
Frequency
1
Intrinsic uncertainty in the frequency response applies as of 10% ... 100% of the measuring range.
2
Signals > 50 kHz: plus 5%
3
Power limiting: frequency x voltage max. 3 x 106 V x Hz where U > 100 V
4
the following applies for the 300 μA measuring range: 7 + 30
Influencing
Quantity
Crest Factor CF
5
Except for sinusoidal waveform
Influencing
Quantity
AC+DC
300.00 V
600.00 V
I
AC
300 μA ... 10 A
I
AC+DC
Sphere of
Influence
1 ... 3
> 3 ... 5 3% rdg.
Sphere of
Influence
> 65 Hz ... 1 kHz 0.5 + 30
3
> 1kHz ... 20 kHz 2 + 30
> 20kHz ... 100 kHz 3 + 30
> 15 Hz ... 45 Hz 2 + 30
3
> 65 Hz ... 5 kHz 2 + 30
3
> 5 kHz ... 20 kHz 3 + 30
> 1 5 H z ... 6 5 H z
> 6 5 H z ... 1 0 kH z
Measured Quantity /
Measuring Range
Influence Error
V, A
Measured Quantity Influence Error
3 + 30
1% rdg.
2
4
75%
Relative Humidity
3 days
V A, , F, Hz, dB, C1 x intrinsic error
instrument off
Battery voltage Range: 1.8 ... 3.6 V ditto Included in intrinsic error
1
5
60 GMC-I Messtechnik GmbH
Technical Data
Influencing
Quantity
Common Mode Interference Voltage
Series Mode Interference Voltage
Sphere of Influence
Interference quantity: max. 600 V
Interference quantity: max. 600 V
50 Hz ... 60 Hz, sine
Interference quantity: V ,
respective nominal value of the
measuring range,
Interference quantity: max. 600 V V > 120 dB
max. 600 V , 50 Hz
... 60 Hz sinusoidal
Meas. Quantity /
Measuring Range
V (3 V ... 600 V MR)
3 V > 60 dB
30 V > 65 dB
300 V/600 V > 50 dB
V> 70dB
Reference Conditions
Ambient temperature +23 C 2K Relative humidity 40 ... 75%, no condensation
allowed Meas. quantity frequency Range: 45 ... 65 Hz Meas. quantity waveform Sinusoidal Battery voltage Range: 1.8 ... 3.2 V
Response Time (after manual range selection)
Measured Quantity /
Measuring Range
V, V, dB
A, A
3 nF ... 300 FMax. 3s
300 ... 3 M 3s
30 M 8s
Continuity < 50 ms
C (Pt100) Max. 3 s
Response Time,
Digital Display
1.5 s
1.5 s
Jump Function
of the Measured Quantity
From 0 to 80%
of upper range limit value
From to 50%
of upper range limit value
Damping
> 120 dB
Measured Quantity /
Measuring Range
>10 Hz 1.5 s
Response Time,
Digital Display
Jump Function
of the Measured Quantity
From 0 to 50%
of upper range limit value
Internal clock
Time format DD.MM.YYYY hh:mm:ss Resolution 0.1 sec. Accuracy 1 minute per month Temperature
influence 50 ppm/K
Data Interface – Infrared
Type Optical via infrared light through the
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.
housing
and parameters
– Query/transmit momentary measure-
ment data
– Read out stored measurement data
GMC-I Messtechnik GmbH 61
Technical Data
Data Interface – Bluetooth (M248B only)
The METRAHIT ULTRA BT Bluetooth multimeter variant (M248B) is identical to the METRAHIT ULTRA (M248A), except that it is also equipped with a Bluetooth interface.
Wireless data exchange via Bluetooth is an alternative to the op­tional IR-USB cable connection using the USB X-TRA accessory (Z216C).
The METRAHIT ULTRA BT with Bluetooth interface is connected di- rectly to the Bluetooth interface of a Windows PC or smartphone (Android). However, no communication takes place with periph­eral devices such as printers, scanners and the like.
The class 2 Bluetooth module which is integrated in the instru­ment achieves transmission ranges of up to 20 m, depending on propagation conditions.
Remote control via Bluetooth is identical to corresponding com­munication via an IR-USB connection.
The only prerequisite for wireless data exchange between multi­meter and PC or smartphone (Android) is switching from Infrared to Bluethooth and authentication by means of an access code which must be set at the multimeter and at the PC or smart­phone, see section 7.2.
Information on the smartphone app METRALOG is available in sec­tion 10.4.2.
Internal Measured Value Storage
Memory capacity 16 MBit (2 MByte) for approx. 300,000
measured values with time stamp
Power Supply
Battery 2 ea. 1.5 V mignon cell (size AA), alkaline
Service life With alkaline manganese: approx. 200 hrs.
Battery test Battery capacity display with battery sym-
Power OFF function The multimeter is switched off automati-
Power pack socket
manganese per IEC LR6 (2 ea. 1.2 V NiMH rechargeable battery also possible)
METRAHIT ULTRA BT: When the Bluetooth interface is activated, power consumption rises considerably and the service life is reduced accordingly.
bol in 4 segments: . Querying of momentary battery voltage via menu function.
cally: – 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 (10 to 59 min.) and the multimeter is not in the continuous operation mode
If the NA X-TRA power pack has been plugged into the instrument (see accesso­ries), the installed batteries are discon­nected automatically. Rechargeable batteries can only be recharged externally.
62 GMC-I Messtechnik GmbH
Technical Data
Display
Transreflective LCD panel (65 x 36 mm) with dis­play of up to 3 measured values, 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.
Digital
Display
/ Char. Height
Number of places 309,999 steps Overflow display “ Polarity display “–” (minus sign) is displayed if plus pole is
Measuring rate 10 measurements per second,
Refresh Rate 2 times per second, every 500 ms
7-segment characters, main display: 13 mm, auxiliary display: 7.5 mm
0L” is displayed for 310,000 + 1 digit
connected to “
40 measurements per second with Min-Max function except with capacitance, frequency and duty cycle measuring functions
(Standard*: noFiL=OFF) 5 x/s (Parameter noFiL=on)
Acoustic Signals
For voltage which exceeds 600 V in the 600 V range:
intermittent signal (250 ms on, 250 ms off)
For current which exceeds 10 A: intermittent signal
which exceeds 16 A: continuous – For displayed temperature > 50 °C
Fuse
Fuse link FF (UR) 10 A/1000 V AC/DC,
10 x 38 mm, breaking capacity: 30 kA at 1000 V AC/DC, protects the current input socket in the 300 A to 10 A ranges
Electrical Safety
Per IEC 61010-1:2010/VDE 0411-1:2011
Protection class Measuring category CAT III CAT IV Operating voltage 600 V 300 V Pollution degree Test Vol t a g e
II
2
5.2 kV~
* All specifications refer to the default update rate with measuring para-
meter noFiL = OFF (default).
GMC-I Messtechnik GmbH 63
Technical Data
Electromagnetic Compatibility (EMC)
Interference emission EN 610326-1:2013, class B Interference immunity EN 610326-1:2013
EN 610326-2-1:2013
Ambient Conditions
Accuracy range 0 C to +40 C Operating temp. range TA–10 C ... +50 C * Storage temp. range –25 C ... +70 C (without batteries) Relative humidity Max. 75 %, no condensation allowed Elevation To 2000 m Deployment
Indoors, except within specified ambient conditions
* Exception: current > 10 A to 16 A, operation at up to 40 °C
Mechanical Design
Housing Impact resistant plastic (ABS) Dimensions 200 x 87 x 45 mm
(without rubber holster) Weight Approx. 0.4 kg with batteries Protection Housing: IP 52
Sockets: IP 20
Table Excerpt Regarding Significance of IP
Codes
IP XY
st
(1
digit X)
2 12.5 mm dia. 0 Not protected 5 Dust protected 2 Dripping (at 15 angle)
64 GMC-I Messtechnik GmbH
Protection Against
Foreign Object Entry
(2
IP XY
nd
digit Y)
Protection Against
Penetration by Water
Technical Data
GMC-I Messtechnik GmbH 65
Maintenance – Calibration
Attention!
!
Note
Note
MEASURE
SETUP
FUNC
ENTER

9 Maintenance and Calibration

Disconnect the instrument from the measuring circuit before opening the battery compartment lid or fuse cover in order to replace batteries or fuses!

9.1 Displays – Error Messages

Message Function Meaning
FUSE
0L

9.2 Batteries

Current measurement Blown fuse
In all operating modes Battery voltage has fallen below 1.8 V
Measuring Indicates overflow
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’s advis­able to remove the batteries during long periods of non-use for this reason (e.g. vacation). This prevents excessive depletion of the batteries, which may result in damage under unfavorable conditions.
Charge Level
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 R 6 or IEC LR 6, or two equivalent rechargeable NiMH batter­ies.
Battery Replacement
Stored measurement data are lost when the batteries are replaced. The selected operating parameters remain in memory, although date and time must be reentered.
66 GMC-I Messtechnik GmbH
Maintenance – Calibration
Attention!
!
Attention!
!
Blown Fuse
fuse
A
DC
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 com-
partment.
Insert two new 1.5 V mignon batteries into the battery com-
partment, 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 envi-
ronmental protection regulations!

9.3 Fuse

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
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 coun-
terclockwise.
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. be-
tween 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.
GMC-I Messtechnik GmbH 67
Maintenance – Calibration
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 again, 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 using the symbol shown at the right per DIN EN 50419.
These devices may not be disposed of with the trash. Please contact our service department regarding the return of old
devices (see address on page 4). If the batteries used in your instrument or accessory product are
depleted, they must be disposed of properly in accordance with valid national regulations. Batteries may contain pollutants and heavy metals such as lead (Pb), cadmium (Cd) and mercury (Hg).
The symbol at the right indicates that batteries must not be disposed of with the trash, and must be brought to a designated collection point.
68 GMC-I Messtechnik GmbH
Maintenance – Calibration

9.6 Recalibration

The measuring tasks performed with your instrument, and the stressing it’s subjected to, influence aging of its components and may result in deviation from the specified levels of accuracy.
In the case of strict measuring accuracy requirements, as well as in the event of use at construction sites with frequent stress due to transport and considerable temperature fluctuation, we recom­mend a relatively short calibration interval of once per year. If your instrument is used primarily in the laboratory and indoors without considerable climatic or mechanical stressing, a calibration inter­val of once every 2 to 3 years is sufficient as a rule.
During recalibration at an accredited calibration laboratory (DIN EN ISO/IEC 17025), deviations from traceable standards demonstrated by your measuring instrument are documented. Ascertained deviations are used to correct displayed values during later use of the instrument.
We would be happy to perform DAkkS or factory calibration for you at our calibration laboratory. Further information is available at our website:
www.gossenmetrawatt.com ( Company  DAkkS Calibration Center or  FAQs  Calibration Questions and Answers)
.
Recalibration of your instrument at regular intervals is essential for the fulfillment of requirements according to quality management systems per DIN EN ISO 9001.

9.7 Manufacturer’s Guarantee

All METRA HIT digital multimeters and calibration instruments are guaranteed for a period of 3 years after date of shipment. The manufacturer’s guarantee covers materials and workmanship. Damages resulting from use for any other than the intended pur­pose or operation 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.
* Examination of the specification, as well as adjustment, are not included
in calibration. However, in the case of our own products, any required adjustment is performed and adherence to the specification is con­firmed.
GMC-I Messtechnik GmbH 69
Accessories
Attention!
!
Note

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).
Using the KS17-2 Cable Set
Measurements per DIN EN 61010-031 may only be per­formed in environments in accordance with measuring categories III and IV with the safety cap attached to the test probe at the end of the measurement cable.
In order to establish contact inside 4 mm jacks, the safety caps have to be removed by prying open the snap fastener with a pointed object (e.g. the other test probe).

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

Electrical Safety
Maximum rated voltage 600 V
Measuring category
Max. rated current: 1 A 1 A 16 A
With safety cap attached
Without safety cap ——
1000 V
1000 V
CAT IV CAT III CAT II

Observe the measuring instrument’s maximum values for electri­cal safety.
Ambient Conditions (EN 61010-031)

10.3 NA X-TRA Power Pack (not included)

Use 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.
Use of the power pack may result in significant deviations for the following measuring functions: mV AC, μA AC and capacitance measurement. We recommend battery operation in this case.
Tem pe rat ur e – 20 C ... + 50 C Relative humidity Max. 80 % Pollution degree
70 GMC-I Messtechnik GmbH
2
Accessories

10.4 Interface Accessories (not included)

10.4.1 Infrared Interface

USB X-TRA Bidirectional Interface Adapter
STARLINE multimeters which are equipped with a serial IrDa inter­face can be connected to a USB port at a PC with the adapter. The adapter allows for data transmission between the multimeter and the PC.
METRAwin10 PC Evaluation Software (for METRAHIT ULTRA
as of 2013)
METRAwin10 PC software is a multilingual, measurement data log-
ging program for recording, visualizing, evaluating and document­ing measured values from METRAHIT multimeters.

10.4.2 Bluetooth Interface

USB Bluetooth Adapter for PC
The following Bluetooth adapters for communication between METRAHIT ULTRA and PC have been successfully tested so far:
Belkin F8T016NG and LOGI LINK BT0007 Bluetooth adapters by other manufacturers should fulfill the fol-
lowing technical minimum requirements: Bluetooth 2.1 + EDR, class 2
Terminal program for PC
Indication and evaluation of the measured values received via a Bluetooth adapter can be effected via a terminal program.
METRALOG App for Smartphone and Tablet PC
Provided you have a smartphone or tablet PC with Android oper­ating system and Bluetooth interface, our METRALOG app in com­bination with the METRAHIT ULTRA BT TRMS Digital Multimeter of- fers the following functions:
• Indication of measured values received from the multimeter as: digital or analog values, measured value curve Y(t) and measured value logger
• Recording of measuring transactions
• Transmission of logs via wireless and network services
• Acoustic warning signal when radio contact is interrupted
• Trigger for exceeding/falling short of adjustable limit
• SMS and/or acoustic warning signal for trigger event
The
METRALOG
app can be obtained via the Google Play Store (see QR code on the right) and installed on your smartphone or tablet PC (Operating System minimum Android 2.3.3).
Attention:
For any errors in the software especially through interaction with other applications, any liability is excluded.
Short-form Instructions
1 Touch the app icon to start the program. 2Select METRAHIT ULTRA BT from the list of recivable Bluetooth devices.
The following message is displayed: „Bluetooth connection to measuring instrument being established“.
3 To establish the radio communication, enter the same pin you have already
bt pin
entered for the interface parameter
of the multimeter, see section 7.2. When the connection has been successful, an analog display appears in which the following message is shown at the bottom right „Measurement in process“.
4 You can switch between digital display, measured value curve Y(t) and ana-
log display in the bottom line on the left.
5 By touching the REC symbol, you can start or stop the recording of the
measured values.
6 Touching the magnifier symbol in the bottom line on the right takes you to
the measured value logger overview where you can select measuring inter­vals for graphic representation of for transmission.
GMC-I Messtechnik GmbH 71
Index

11 Index

A
Addr ........................................................................57
APoFF .....................................................................51
App METRALOG .....................................................71
Automatic Shutdown
Disabling .......................................................17
Set Time ........................................................17
B
bAtt .........................................................................50
Batteries
Charge Level
Periods of Non-Use ......................................66
Replacement .................................................67
bEEP .......................................................................52
bEEPEr on/oFF .......................................................52
Bluetooth ................................................................56
bt Pin ......................................................................57
...........................................13, 66
C
Cable Resistance ...................................................39
cALdAt ....................................................................50
Capacitance Measurement ...................................40
Com bt ....................................................................57
Com ir .....................................................................57
Continuity Test .......................................................36
Current Clamp Sensor .....................................44, 45
Current Clamp Transformer ..................................46
Current Measurement
Notes .............................................................41
Scope of Functions .......................................41
72 GMC-I Messtechnik GmbH
D
dAtE ...................................................................50, 51
Default Settings ......................................................55
Device Disposal ......................................................68
Diode Test ...............................................................37
Display Illumination ................................................16
Duty Cycle Measurement .......................................34
E
Error Messages ......................................................66
F
Fuse
Characteristic Values
Replacement .................................................67
....................................63
H
HYSt ........................................................................53
I
Interfaces
Accessories ...................................................71
select .............................................................57
States ............................................................13
irStb .........................................................................57
itEMP .......................................................................50
M
Maintenance
Housing .........................................................68
Manufacturer’s Guarantee .....................................69
Measurement Cables .............................................70
Measuring Categories
Significance
METRALOG App ..................................................... 71
.................................................... 8
N
noFiL ....................................................................... 52
O
OCCUP .................................................................... 50
Overview
Keys and Connections .................................. 12
Parameters ...................................................49
P
Power Pack
Accessories .................................................. 70
Adapter Socket Position ............................... 15
Initial Start-Up ............................................... 16
Product Support ....................................................... 3
Product Support Hotline .......................................... 3
R
rAtE ......................................................................... 53
Recalibration Service .........................................4, 69
Reference Junction ................................................ 38
Repair and Replacement Parts Service .................. 4
Resistance Measurement ...................................... 35
S
Safety Precautions ................................................... 8
Sampling Rate (rAtE parameter) ........................... 53
Scope of Delivery ..................................................... 2
Software Enabling .................................................... 3
Storage Speed (rAtE parameter) ...........................53
Switching On
..........................................................16
Manual
Via PC ............................................................16
Symbols
............................................................15
Device
Digital Display ...............................................13
Rotary Switch Positions ................................14
T
tEMP intErn/ExtErn .................................................52
tEMP unit ................................................................52
Temperature Measurement
With Resistance Sensors
..............................39
With Thermocouples .....................................38
Terminal program ..................................................71
tiME ...................................................................50, 51
Transmission Speed (rAtE parameter) ..................53
triG ..........................................................................54
tStorE ......................................................................54
U
USB Bluetooth adapter for PC ...............................71
Use for Intended Purpose ......................................10
V
vErSion ....................................................................50
Voltage Comparator ...............................................32
Voltage Measurement
.............................................................28
Notes
Scope of Functions .......................................28
W
WEEE Mark .............................................................15
Index
GMC-I Messtechnik GmbH 73
Edited in Germany Subject to change without notice PDF version available on the Internet
GMC-I Messtechnik GmbH Südwestpark 15 90449 Nuremberg
Germany
Phone: +49-911-8602-111 Fax: +49-911-8602-777 e-mail: info@gossenmetrawatt.com www.gossenmetrawatt.com
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