Gossen Metrawatt M245A, METRACAL MC User guide
Operating Instructions
METRACALMC
Multimeter, Calibrator
3-349-566-03
11/11.17
Standard Equipment Contact Persons
Scope of Delivery
1 Multimeter, calibrator
1 KS29 measurement cable set
2 Batteries
1 Condensed operating instructions *
1 DAkkS calibration certificate
* Detailed operating instructions are available for download on
the internet at www.gossenmetrawatt.com
Overview of Features included
Functions Multimeter
V AC / Hz TRMS
V DC
Hz (V AC)
A AC / Hz TRMS
A DC
Hz (A AC)
Resistance
Continuity
Diode ... 6 V
Temperature TC
Temperature RTD
Capacitance
Min-Max / data hold
16 MBit memory
1)
Features
IR Interface
Power pack socket
Protection (housing)
Measuring category
1)
For 46,000 measured values, sampling rate adjustable from 0.1 second
300 V CAT II
to 9 hours
Calibrator /
Simulator
Pulse generator /
frequency
generator
Current sensor /
current sink
IP 65
—
—
—
—
—
—
—
—
—
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 11 on page 80.
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 METRAwin 10
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
Standard Equipment Contact Persons
Recalibration Service
Our service center calibrates and recalibrates (e.g. after one year as
part of your test equipment monitoring system, prior to use etc.)
all instruments from GMC-I Messtechnik GmbH and other
manufacturers, 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
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) in accordance with DIN EN ISO/IEC
17025 under registration number D-K-15080-01-01.
We offer a complete range of expertise in the field of metrology:
from test reports and proprietary 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.
Accredited measured quantities: direct voltage, direct current values,
DC resistance, alternating voltage, alternating current values, AC active
power, AC apparent power, DC power, capacitance, frequency and
temperature
4 GMC-I Messtechnik GmbH
Contact Persons
GMC-I Messtechnik GmbH 5
Table of Contents
Contents Page Contents 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 .................................................18
4.1.3 Quick Measurements ......................................................................19
4.2 Zero Offset / Relative Measurements ...............................................19
4.3 Display (LCD) .................................................................................20
4.3.1 Exceeding the Measuring Range .....................................................20
4.4 Measured Value Storage: DATA (auto-hold / compare) ......................21
4.4.1 Saving Minimum and Maximum Values – Min/Max Function .............22
4.5 Measurement Data Recording .........................................................23
5 Measurements ................................................................. 26
5.1 Switching from the Calibration Function to the Measuring Function ...26
5.2 Voltage Measurement ....................................................................27
5.2.1 Direct Voltage Measurement, V DC .................................................28
5.2.2 Alternating Voltage and Frequency Measurement, V AC and Hz .........29
5.3 Resistance Measurement
5.4 Continuity Test ..............................................................................31
5.5 Diode Testing with Constant Current of 1 mA ..................................32
5.6 Temperature Measurement ............................................................33
5.6.1 Measurement with Thermocouples, Temp TC .................................. 33
5.6.2 Measurement with Resistance Thermometers ..................................34
5.7 Capacitance Measurement ............................................................36
5.8 Current Measurement .................................................................... 37
5.8.1 Direct Current Measurement, A DC .................................................38
5.8.2 Alternating Current and Frequency Measurement,
Direct Connection, mA AC and Hz ................................................... 39
5.8.3 Direct Current Measurement with Current Clamp Sensor, mA DC ......40
5.8.4 AC Measurement with Current Clamp Sensor, A AC and Hz ..............41
5.8.5 Direct and Alternating Current Measurement with Current Clamp
Transformer, mA DC, mA AC and Hz ...............................................42
6 GMC-I Messtechnik GmbH
Table of Contents
Contents Page Contents Page
6 Calibration Functions ........................................................ 44
6.1 Switching from the Measuring Function to the Calibration Function ... 44
6.2 Voltage Source [V] ......................................................................... 45
6.3 Pulse, Frequency Generator (positive square-wave pulse) [Hz] .......... 46
6.4 Resistance Simulation [] ..............................................................47
6.5 Temperature Simulation [°C / °F] .................................................... 48
6.5.1 Temperature Simulation for Resistance Thermometers –
RTD Temperature Setting ............................................................... 49
6.5.2 Temperature Simulation for Thermocouples –
TC Temperature Setting .................................................................49
6.6 Current Source and Current Sink [mA] ............................................51
6.6.1 Current Sink – Simulation of a 2-Wire Transmitter .......................... 52
6.6.2 Current Source ............................................................................. 52
6.7 Interval Functions, Ramp Functions ................................................. 53
6.7.1 Interval Sequences – INT Function .................................................. 53
6.7.2 Read-Out a Periodic Ramp – RAMP Function .................................. 56
6.7.3 Dual Mode (simultaneous simulation and measurement) .................. 58
7 Device and Measuring Parameters ...................................60
7.1 Paths to the Various Parameters .................................................... 61
7.2 List of All Parameters .................................................................... 61
7.3 Querying Parameters – InFo Menu (as moving letters) ...................... 62
7.4 Entering Parameters – SETUP Menu ............................................... 62
7.5 Default Settings ............................................................................. 64
8 Interface Operation ...........................................................66
8.1 Activating the Interface ...................................................................66
8.2 Configuring Interface Parameters .................................................... 67
9 Technical Data .................................................................68
10 Maintenance and Calibration ............................................76
10.1 Displays – Error Messages ............................................................ 76
10.2 Batteries ....................................................................................... 76
10.3 Fuse ............................................................................................. 77
10.4 Housing Maintenance .................................................................... 78
10.5 Return and Environmentally Sound Disposal .................................... 78
10.6 Recalibration ................................................................................. 79
10.7 Manufacturer’s Guarantee .............................................................. 79
11 Accessories .......................................................................80
11.1 General ......................................................................................... 80
11.2 Technical Data for Measurement Cables
(scope of delivery: KS29 safety cable set) ........................................ 80
11.3 NA X-TRA Power Pack (not included) .............................................. 80
11.4 Interface Accessories (not included) ................................................ 81
12 Keyword Index ..................................................................82
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 all requirements of applicable European and
national EC directive. We confirm this with the CE mark. The
relevant declaration of conformity can be obtained from
GMC-I Messtechnik GmbH.
The device has been manufactured and tested in accordance
with safety regulations IEC 61010–1/DIN EN 61010–1/
VDE 0411–1. 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.
Measuring Categories and their Significance per IEC 61010-1
CAT Definition
Measurements in electrical circuits
I
which are not directly connected to the mains,
e.g. electrical systems in motor vehicles and aircraft, batteries etc.
Measurements in electrical circuits
II
which are directly connected to the low-voltage mains
via plug, e.g. in household, office and laboratory applications etc.
Measurements in building installations:
III
stationary consumers, distributor terminals, devices connected permanently to
the distributor
The measuring category and the maximum rated voltage which
are printed on the device apply to your measuring instrument, e.g.
300 V CAT II.
Refer to section 11.2 regarding use of the measurement cables.
Observe the following safety precautions:
• The multimeter may not be used in potentially explosive
atmospheres.
• The multimeter may only be operated by persons who are
capable of recognizing contact hazards and taking the
appropriate safety precautions. Contact hazards according to
the standard exist anywhere, where voltages of greater than
33 V RMS or 70 V DC may occur. Avoid working alone when
taking measurements which involve contact hazards. Be
certain that a second person is present.
• Maximum permissible voltage
between the voltage measuring sockets or all connector sockets and ground is 300 V for measuring category II.
• Be prepared for the occurrence of unexpected voltages at
devices under test (e.g. defective devices). For example,
capacitors may be dangerously charged.
8 GMC-I Messtechnik GmbH
Safety Precautions
Attention!
!
Note
• Make certain that the measurement cables are in flawless
condition, e.g. no damage to insulation, no interruptions in
cables or plugs etc.
• Device functions may not be executed 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 9, “Technical Data”, in the table entitled
“Measuring Functions and Measuring Ranges” in the
“Overload Capacity” column.
• The multimeter may only be operated with installed batteries or
rechargeable batteries. Dangerous currents and voltages are
otherwise not indicated, and the instrument may be damaged.
• The instrument may not be operated if the fuse cover or the
battery compartment lid has been removed, or if its housing is
open.
• The input for the current measuring range is equipped with a
fuse link. Maximum permissible voltage for the measuring
circuit (= rated voltage of the fuse) is 400 V. Use specified fuses
only (see page 73)! The fuse must have a
breaking capacity of at least 10 kA.
Special Safety Precautions for the Calibrator
• If necessary, use the multimeter section of the instrument to
make sure that no dangerous contact voltages are present in
the signal circuits to which the instrument is to be connected.
• In order to prevent damage to the instrument, observe the
maximum allowable voltage and current values indicated at
the jacks.
With the exception of the resistance simulation and mA SINK
operating modes, the connected signal circuits should not
feed any voltage or current back to the calibrator.
In order to avoid damage to the instrument when interference
voltages are applied (within allowable limit values),
the mA SINK and mA SOURCE circuits are equipped with an fuse,
which makes this circuit highly resistive in the event that
excessive current should occur in case of a fault for the
duration of overloading.
If the calibrator is connected with reversed polarity, a high
current may occur which trips the integrated fuse.
Please observe the following prior to connecting the DUT:
Switch on the instrument and adjust the correct calibrator
function before connecting the DUT. Otherwise, a high
current may flow through the DUT for a short while after
power-on, thus interfering with the fuse test.
GMC-I Messtechnik GmbH 9
Safety Precautions
Warning!
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
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 of parts.
If repair of a live open instrument is required, it may only be carried out by trained personnel who are familiar with the dangers
involved.
Defects and Extraordinary Strains
If it may be assumed that the instrument can no longer be
operated safely, it must be removed from service and secured
against unintentional use.
Safe operation can no longer be relied upon:
• If the device demonstrates visible damage
• If the instrument no longer functions, or if malfunctioning
occurs
• After long periods of storage under unfavorable conditions,
e.g. humidity, dust or extreme temperature (see
“Ambient Conditions” on page 73).
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 within the specified
measuring category (see section 9 and the table on page 8
regarding significance).
• Overload limits may not be exceeded. See technical data on
section 9 for overload values and overload limits.
• Measurements may only be performed under the specified
ambient conditions. See section 9 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 section 9).
The instrument may not be operated in explosive
atmospheres, or connected to intrinsically safe electrical
circuits.
10 GMC-I Messtechnik GmbH
1.2 Meanings of Danger Symbols
!
(2x)
...
...
Warning concerning a source of danger
(attention: observe documentation!)
1.3 Meanings of Acoustic Warning Signals
Warning for dangerous voltage at the measurement input:
U > 33 V AC or U > 70 V DC (double acoustic signal)
Warning for excessive current in the 300 mA measuring range:
> 310 mA (intermittent acoustic signal)
Voltage warning: > 310 V (intermittent acoustic signal)
Safety Precautions
GMC-I Messtechnik GmbH 11
Operating Overview – Connections, Keys, Rotary Switch, Symbols
1
3
4
15
5
6
8
section 4.3
section 3
section 5
section 8
section 7
section 3
ff
12
11
section 6
9
2
section 4.1.2
13
Max. 300 V !
10
14
section 4.1
section 4.4
section 7
section 3
section 7
section 3.1
7
section 1.2
Not a measuring input!
Do not connect external voltage
except for current sink.
!
2
Operating Overview – Connections, Keys, Rotary Switch, Symbols
1 Display (LCD) (see page 13 for significance of symbols)
2 MAN / AUTO Shift key for manual/automatic measuring range selection
Increase parameter values
Operating mode menu: Selection of individual menu entries against
direction of flow
3
ON / OFF | LIGHT
key for switching device and display illumination on and off
4 OUT | ENTER
OUT: Switch calibrator output on and off
Operating mode menu: Acknowledge entry (ENTER)
Increase measuring range or move decimal point to the right (MAN function)
5
6 Rotary switch for measuring functions (white) and calibration functions
(red), (see page 13 for significance of symbols)
7 DAkkS calibration mark
8 Connector jacks for calibrator output
9 Connector jacks for measuring and sensing inputs
10 DATA / MIN / MAX
Key for freezing, comparing and deleting the measured value, and for the
Min-Max function
Decrease values
Operating mode menu: Selection of individual menu entries in the
direction of flow
11 MEASURE / CAL | SETUP
Key for switching between measuring, calibration and menu functions
12 ZERO / SEL | ESC
Key for zero balancing and for selecting double functions
Operating mode menu: Exit current menu level and return to a higher level.
Exit parameters entry function without saving. Pause ramp/interval
Decrease measuring range or move decimal point to the left (MAN function)
13
14 Power pack connector jack
15 Infrared interface
12 GMC-I Messtechnik GmbH
Symbols Used in the Digital Display
1 28
9
14
16
18
654 7
9
3
Battery full
*
Battery OK
*
Battery weak
Battery (almost) dead, U < 1.8 V
Data transmission to / from calibrator active
IR interface in stand-by mode
(ready to receive power-up commands)
Battery Level Indicator
Interface Indicator (with rotary switch setting OFF)
11
13
10
15
22 242120
19
17
23
12
* Calibration function: current I
Sink
possible (U > 2.3 V)
Operating Overview – Connections, Keys, Rotary Switch, Symbols
1 Battery level indicator
2 NUM: Numeric entry of the output signal
3 INT: Interval sequence active
4 RAMP: Ramp function active
5 SINK: Current sink active
6 SOURCE: Current source active
7 ON: Calibrator output active
8 IR: infrared interface indicator
9 Auxiliary display with decimal point and polarity display
10 STORE: memory mode active
11 Selected type of current
12 Transformation ratio (current clamp factor)
13 Diode measurement selected
14 Unit of measure
15 Continuity test with acoustic signal active
16 : Continuous operation (automatic shutdown deactivated)
17 Digital display with decimal point and polarity display
18 RTD: selected nickel or platinum resistance thermometer
19 TC: temperature measurement with thermocouple types B through U
20 MAN: manual measuring range selection active
21 DATA: display memory, “freeze measured value”
22 max/min: Min-Max value storage
23 : relative measurement with reference to offset
24 ZERO: zero balancing active
GMC-I Messtechnik GmbH 13
Operating Overview – Connections, Keys, Rotary Switch, Symbols
Symbols Used for Rotary Switch Positions
Rotary Switch
V —mV, V DC Direct voltage
V~ 0/2 mV, V ~ AC TRMS Alternating voltage, AC TRMS, full bandwidth
Hz (V) 1 Hz, kHz ~ AC — Voltage frequency, full bandwidth
Temp . TC —
Temp . RTD — C Pt100/1000
mA —μA, mA DC Direct current value
mA~ — μA, mA ~ AC TRMS Alternating current amperage, AC TRMS
SEL
Display ZERO Measuring Function – White Printing
0/2 , k, M(DC) resistance
1 — Continuity test with acoustic signal
—
—nF μF Capacitance
V DC — Diode voltage
C types B ... U
C Ni100/1000
— Temperature, type K thermocouple
Temperature with resistance thermometer
Rotary Switch
V — V DC Direct voltage simulator
Hz — Hz Pulse / frequency generator
Temp . TC —
Temp . RTD — C Pt100/1000
mA — mA Current sink
mA — mA Current sensor
14 GMC-I Messtechnik GmbH
SEL
Display Calibration Function – Red Printing
0/2 (DC) Resistance simulator
C types B ... U
C Ni100/1000
Thermocouple simulator
Resistance thermometer simulator
Operating Overview – Connections, Keys, Rotary Switch, Symbols
!
5V/600mA
Serial number
Registration number
Date of calibraion (year – month)
German Accrediation Body GmbH – Calibration lab
XY123
2012-08
D-K-
15080-01-01
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 source of danger
(attention: observe documentation!)
Ground
CAT II
Overvoltage category II (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
See also section 3.1 regarding location of the
power pack adapter socket.
Fuse for current measuring ranges, see section 10.3
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 by entering the search
term WEEE (see also section 10.5).
Calibration mark (blue seal):
See also “Recalibration” on page 79.
EC label 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 10.2 regarding correct battery
installation.
Momentary battery voltage can be queried in the Info menu (see
section 7.3).
Disconnect the instrument from the measuring circuit before
opening the battery compartment lid in order to replace the
batteries.
Operation With Power Pack
(accessory, not included, see section 11.3)
Installed batteries are disconnected electronically if the 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 7.4).
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 or calibrating 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 10.2).
3.3 Setting the Operating Parameters
Setting Time and Date
See the “t iME” and “dAtE” parameter in section 7.4.
16 GMC-I Messtechnik GmbH
Initial Start-Up – Setup
ON / OFF
LIGHT
OUT
ENTER
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.
➭ Complete shutdown of all functions including the IR interface is
accomplished by turning the rotary switch to OFF.
In the calibration function, the output can be shut down
separately with the OUT | ENTER key.
Shutdown is acknowledged with a brief acoustic signal.
Exceptions:
If a dangerous voltage is present at the input, shutdown is blocked and an acoustic signal is generated. The instrument must be
disconnected from the measuring cables before being switched
off.
Automatic Shutdown – DMM
The instrument is switched off automatically if the measured value
remains unchanged for a long period of time (maximum measured
value fluctuation of approx. 0.8% of the measuring range per
minute, or 1 C or 1 F per minute), and if none of the keys or the
rotary switch have been activated before a selected period of time
in minutes has elapsed (see “APoFF” parameter on page 63).
Shutdown is acknowledged with a brief acoustic signal.
Exceptions:
Transmission and memory mode operation, continuous operation
and whenever a dangerous voltage is applied to the input
(U > 33 V AC or U > 70 V DC).
Automatic Shutdown – Calibrator
The device is switched off automatically after the selected time,
“APoFF” (see page 63), has elapsed. The display is shut down
after one additional minute, assuming that neither the rotary
switch nor any of the keys are activated.
The display can also be switched off by pressing the
ON / OFF | LIGHT key.
Automatic shutdown of the outputs is disabled in the continuous
operation mode (AP oFF = on).
Disabling Automatic Shutdown
The instrument can be set to continuous operation.
➭ Simultaneously press the
and keys to this end.
or
➭
Select AP oFF = on in the setup menu (see “
APoFF
” on page 63.)
Continuous operation is indicated at the display with the
symbol.
The “Continuous On” setting can only be canceled by changing the respective parameter, and not by switching the instrument off if automatic
shutdown has been deactivated in the setup menu (see “APoFF” on page
63).
GMC-I Messtechnik GmbH 17
Control Functions
Note
4 Control Functions
4.1 Selecting Measuring Functions and Measuring Ranges
The desired measuring function (white symbols) is selected with
the rotary switch. Double functions like Hz and continuity testing
are selected with the OUT | ENTER key.
4.1.1 Automatic Range Selection
The multimeter is equipped with auto-ranging for all measuring
functions except for temperature measurement, and diode and
continuity testing. Auto-ranging is active as soon as the
instrument is switched on. The instrument automatically selects
the measuring range which allows for highest possible resolution
of the applied quantity. When the instrument is switched to
frequency measurement, the previously selected voltage
measuring range remains active.
AUTO-Range Function
The multimeter is switched automatically to the next higher range
at (30,999 d + 1 d 31,000 d) and to the next lower range at
(2700 d - 1 d 2699 d).
Exception, capacitance measurement:
The multimeter is switched automatically to the next higher range
at (3099 d + 1 d 310 d) and to the next lower range
at (270 d - 1 d 2699 d).
4.1.2 Manual Measuring Range Selection
Auto-ranging can be deactivated and measuring ranges can be
selected manually in accordance with the following table by
pressing the MAN / AUTO button.
The desired measuring range can then be selected with the
scroll key.
or
The instrument is automatically returned to range selection when
the MAN / AUTO key is pressed, the rotary switch is activated or the
instrument is switched off and back on again.
Overview: Auto-Ranging and Manual Range Selection
Function Display
MAN / AUTO
Range switching sequence for:
V
: 60 mV* 300 mV* 3 V 30 V 300 V
or
MAN / AUTO
* Via manual measuring range selection only
** The momentary measured value is used as a reference point during zero
balancing, and is subtracted from future measured values.
Maximum correction is 50% of the measuring range. If the measuring
range is changed with the help of the MAN key, the ZERO function
remains active (at the display and in memory).
Hz: 300 Hz
:
300 3 k 30 k
A:
300A 3 mA 30 mA 300 mA
30 nF 300 nF 3F 30F 300F
F:
Return to automatic measuring range selection —
Manual mode active:
Utilized measuring range is fixed
3 kHz 30 kHz 300 kHz
300 k
3 M
30 M
MAN
MAN
Use short or shielded measurement cables in case of
high-impedance resistance (3 M or 30 M range).
18 GMC-I Messtechnik GmbH
Control Functions
Note
4.1.3 Quick Measurements
Measurements performed using a suitable fixed measuring range
are executed more quickly than those which utilize automatic
range selection. Quick measurement is made possible with the
following two functions:
• Manual measuring range selection, i.e. selection of the measuring
range with the best resolution (see section 4.1.2)
or
•With the DATA function (see section 4.4). In this way, the
appropriate measuring range is selected automatically after the
first measurement, and the second measurement is executed
more quickly.
The selected measuring range remains active for the subsequent
series of measurements with these two functions.
4.2 Zero Offset / Relative Measurements
Zero balancing or a reference value for relative measurements can
be stored to memory depending upon deviation from the zero
point:
Deviation from zero point
– with short-circuited measurement cables for V, , mA, RTD
– with open input for capacitance unit of measure F
0 to 200 digits ZERO
> 200 to 15000 digits
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 / SEL | ESC key.
The instrument acknowledges zero balancing with an acoustic
signal, and the “D ZERO” 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 / SEL | ESC key.
As a result of TRMS measurement, the multimeter displays a
residual value of 1 to 30 digits with short-circuited
measurement cables as the zero point for V AC/I AC
measurements (non-linearity of the TRMS converter). This
has no influence on specified accuracy above 2% of the
measuring range (or 3% in the mV range).
GMC-I Messtechnik GmbH 19
Control Functions
4.3 Display (LCD)
4.3.1 Exceeding the Measuring Range
Measured Value, Unit of Measure, Type of Current, Polarity
The measured value appears at the digital display with decimal
and plus or minus sign. 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.
Exceptions: “0L” appears as of 3100 digits for capacitance
measurement, and as of 61,000 digits for diode testing.
20 GMC-I Messtechnik GmbH
Note
V, mA, Hz
t [s]
100%
10%
Activated
Reactivated
Save
Save
30,000 Digits
of Measuring Range
F
31,000 Digits
OL
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
in the top left section of the auxiliary display as well as the associated „freeze time“ in the top right section and an acoustic signal is
generated. The test probes can now be removed from the measuring points, and the measured value can be read from the digital display. If the
measuring signal falls below the value specified in the table, the
function is reactivated for storage of the next value.
Measured Value Comparison (DATA Compare)
If the currently frozen value deviates from the first saved value by
less than 100 digits, the acoustic signal is generated twice. If
deviation is greater than 100 digits, only a brief acoustic signal is
generated.
However, when the digital display is “frozen”, the decimal
point is fixed as well (fixed measuring range, symbol: MAN).
The selected measuring range should not be manually
changed as long as the DATA function is active.
The DATA function is deactivated by pressing and holding the
DATA/MIN/MAX key (approx. 1 second), when the measuring function is changed or when the instrument is switched off and back
on again.
Control Functions
Condition Response from Instrument
DATA
Function
Activate Brief Once
Save
(stabilized
measured
value)
Reactivate
Change to
Min/Max
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
saved value by less than 100 digits.
Key: MV = measured value, MR = measuring range
Data/
Min/Max
1)
Measuring
Key
Brief See table, section 4.4.1
Function
V, A, F, Hz,
RTD TC
V, A, F, Hz,
RTD TC
Measuring
Signal
> 10%
rdg.
0L
< 10%
rdg.
= 0L
Auxiliary Display Acous-
top left top right
frozen
MV is
indicated
indicated
Stored
MV
Is deleted Is deleted
„Freeze
time“ is
tic Sig-
Once
Twi ce
Tw ic e
nal
2)
GMC-I Messtechnik GmbH 21
Control Functions
Note
Example
The voltage measuring range is set manually to 10 V.
The first measured value is 5 V and is stored to memory because
it is greater than 10% of the measuring range. As soon as the
measured value drops to less than 10% of the measuring range,
i.e. amounts to less than 1 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.
Min-Max
Function
Activate
and save
Save and
display
Stop Long Are deleted
Data/
Min/Max
Key
1
1 x brief Are saved
Brief
2
Brief
Min. and Max.
Measured Values
Storage continues in background, new min. and max.
values are displayed together
with the point in time of
occurrence.
Response from Instrument
Display
Digital
Measured
Valu e
Current
measured
value
Saved min.
value
Saved max.
value
Current
measured
value
Max.
Min.
Min.
Min.
Max.
Is
deleted
Acous
tic
Sig-
nal
Once
Once
Once
Twi ce
As opposed to the DATA function, the Min/Max function can
also be used for temperature measurement.
22 GMC-I Messtechnik GmbH
Control Functions
MEAS / CAL
SETUP
OUT
ENTER
OUT
ENTER
4.5 Measurement Data Recording
The multimeter is capable of recording measurement data using
an adjustable sampling rate for long periods of time in the form of
measurement series. Data are stored to a battery backed
memory module, and are retained even after the multimeter is
switched off. The system acquires measured values relative to
real-time.
Stored measured values can subsequently be read out with the
help of METRAwin 10 software. The only prerequisite is a PC which
is connected by means of an interface cable to the
USB X-TRA bidirectional interface adapter, which is plugged onto
the digital multimeter. See also section 8.
Memory Parameters Overview
Parameter Page: Header
CLEAr
EMpty
0CCvP
rAtE
StArt
StoP
24: Clear Memory
24: Clear Memory – appears after CLEAr
24: Querying Memory Occupancy
62: rAtE – set the sampling rate
23: Starting Recording via Menu Functions
24: Ending Recording
The STORE Menu Function
➭ First set the sampling rate for memory mode operation
(see section 7.4 the rAtE parameter), and then start memory
mode operation.
➭ Select the desired measuring function and an appropriate
measuring range.
➭ Check the battery charge level before starting long-term
measurement recordings (see section 7.3).
Connect the NA X-TRA power pack if applicable.
Starting Recording via Menu Functions
➭ Switch to the “SETUP” mode by pressing MEAS / CAL | SETUP and
select the “StorE” menu.
... StorE StArt StorE
1nFo
STORE
➭ Memory mode operation is started by acknowledging with
OUT | ENTER. The small STORE segment appears, indicating that
the memory mode has been activated.
“Store” appears at the digital display, indicating that you’re still
in the menu function.
➭ Press MEAS / CAL | SETUP in order to return to the measuring
function.
GMC-I Messtechnik GmbH 23
Control Functions
Note
OUT
ENTER
OUT
ENTER
MEAS / CAL
SETUP
OUT
ENTER
MEAS / CAL
SETUP
OUT
ENTER
MEAS / CAL
SETUP
OUT
ENTER
OUT
ENTER
During Recording
In order to be able to observe measured values during recording,
switch to the measuring function by pressing
MEAS / CAL | SETUP. After pressing MEAS / CAL | SETUP once again,
the display is returned to the 1nfo menu where memory
occupancy can be queried with the 0CuPP parameter.
As soon as memory is full, the “Store” segment is cleared
from the display.
A new memory block is created when another measuring function
is selected with the rotary switch or the OUT | ENTER key. Data storage then continues automatically.
Ending Recording
store stop store
➭ Press MEAS / CAL | SETUP in order to return to the measuring
function.
➭ Memory mode operation can also be exited by switching the
multimeter off.
Querying Memory Occupancy
Memory occupancy can be queried during recording with the
help of the “1nFo” menu (see also section 7.3).
Memory occupancy range: 000.1% to 099.9%.
1nFo
bAtt:
...
0CCvP
%:
017.4
%
Memory occupancy can be queried before recording is started via
the “1nfo” menu.
... StorE 017.4 % StArt
1nFo
Clear Memory
This function deletes all measured values from memory! This
function cannot be executed during memory mode operation.
... StorE StArt
1nFo
Clear
yes
empty StorE
24 GMC-I Messtechnik GmbH
Control Functions
GMC-I Messtechnik GmbH 25
V/Hz, , Temperature, and A/Hz Measurements
0230.6
V
AC
0050.0
Hz
V~
Hz
MEAS/CAL
SETUP
V~
CALIBRATOR MULTIMETER
Hz
15.000 calibV
Long
–+ +
–+ +
–+ +
5 Measurements
5.1 Switching from the Calibration Function to the Measuring Function
If any calibration function is active, press and hold the
MEASURE / CAL | SETUP key in order to activate the measuring function.
26 GMC-I Messtechnik GmbH
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