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
1Multimeter
1 KS17-2 measurement cable set
2 Batteries
1 DAkkS calibration certificate
1 Rubber holster
1 Condensed operating instructions *
* Detailed operating instructions are available for download on the Internet
at www.gossenmetrawatt.com
Included Functions
Function METRAHIT ULTRA /
Voltage, V
(Ri 10 M) ✓
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 transmissionto / 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 1°Pt100 Temperature with Pt100 / Pt1000 resistance sensor
A 0/3 A DC — Direct current value
A 1 A DC+AC TRMS Hz Pulsating current amperage, TRMS AC+DC / current frequency
A 2 Hz A DC+ AC TRMS Frequency / pulsating current amperage, TRMS AC DC
A~ 0/2 A~ AC TRMS Hz Alternating current amperage, TRMS AC / current frequency
Hz (A) 1 Hz ~ AC Hz ~ AC Current frequency / alternating current amperage, TRMS AC
Hz ( ) 1 Hz ~ AC ~ AC Current frequency
FUNC
Main Display Auxiliary Display Measuring Function
—
(High) frequency at 5 V~ up to 1 MHz
— —(DC) resistance
0/2 — Continuity test () with acoustic signal
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 1 C or 1 per minute), and if none of the keys or the rotary
switch have been activated before a selected period of time in
minutes has elapsed (see “APoFF” parameter on page 51). Shutdown is acknowledged with a brief acoustic signal.
Automatic shutdown is disabled in the following operating modes: continuous
operation and whenever dangerous contact voltage has been detected (exception: memory mode).
Disabling Automatic Shutdown
The instrument can be set to continuous operation.
➭ While switching the instrument on, simultaneously press the
and keys to this end.
Initial Start-Up – Setup
The “Continuous On” function is indicated at by means of the
ON display to the right of the battery symbol.
The “Continuous On” setting can only be canceled by changing the
respective parameter (see “APoFF” page 51) or by switching the
instrument off manually.
In this case, the parameter is reset to 10 minutes.
GMC-I Messtechnik GmbH 17
Control Functions
230.00
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 5¾ 310,000 28,000
V , V , A , A 4¾ 31,000 2800
3 nF ... 3 mF 3¾ 3100 280
Resolution
Switching to Next
Higher Range
at (... d + 1 d)
Switching to Next
at (... d -1 d)
Lower Range
4.1.2 Manual Measuring Range Selection
Auto-ranging can be deactivated and measuring ranges can be
selected manually in accordance with the following table by
pressing the MAN / AUTO button.
The desired measuring range can then be selected with the
or
scroll key.
The instrument is automatically returned to automatic range selection when the MAN / AUTO key is pressed, the rotary switch is
activated or the instrument is switched off and back on again.
Overview: Auto-Ranging and Manual Range Selection
Function Display
MAN / AUTO
Range switching sequence for:
V :
300 mV* 3V 30 V 300 V 600 V
Hz (V AC)
:300 Hz 3 kHz 30 kHz 300 kHz
MHz:
300 Hz 3 kHz 30 kHz 300 kHz 1 MHz
:
or
MAN / AUTO
* Via manual measuring range selection only
300
A :
300A 3 mA 30 mA 300 mA 3A 10 A (16 A)
Hz (A AC):
300 Hz 3 kHz 30 kHz
F :
3 nF30 nF 300 nF 3F 30F 300F
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
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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
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