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
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.
4GMC-I Messtechnik GmbH
Contact Persons
GMC-I Messtechnik GmbH5
Table of Contents
ContentPageContentPage
1Safety Features and Precautions ....................................... 8
1.1Use for Intended Purpose ................................................................10
1.2Meanings of Danger Symbols ..........................................................11
1.3Meanings of Acoustic Warning Signals ............................................11
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
CATDefinition
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:
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.
8GMC-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 GmbH9
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).
10GMC-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)
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
Switch
V~0/4 V~ AC TRMSHzAlternating voltage, AC TRMS, full bandwidth / voltage frequency
Hz (V)1HzV~ ACVoltage frequency, up to 300 kHz / alternating voltage, AC TRMS
V~ 2V FILTER ~ AC TRMSHzAlternating voltage, AC TRMS, with low pass filter (1 kHz) / voltage frequency
dB3dBV~ AC TRMSAlternating voltage level measurement
V0/4 V DC +AC TRMSHzPulsating voltage, TRMS () / voltage frequency
V1HzV DC + AC TRMSVoltage frequency / pulsating voltage, TRMS
V2V FILTER DC+AC TRMSHzPulsating voltage, TRMS with low pass filter (1 kHz) / voltage frequency
dB3dBV DC + AC TRMSAlternating voltage level measurement
V 0/2 V DC—Direct voltage
MHz0/2 MHz
%1%HzDuty cycle / frequency
Temp. T C0/2
Temp. R T D1°Pt100Temperature with Pt100 / Pt1000 resistance sensor
A0/3 A DC—Direct current value
A1A DC+AC TRMSHzPulsating current amperage, TRMS AC+DC / current frequency
A2HzA DC+ AC TRMSFrequency / pulsating current amperage, TRMS AC DC
A~0/2 A~ AC TRMSHzAlternating current amperage, TRMS AC / current frequency
Hz (A)1Hz ~ ACHz ~ ACCurrent frequency / alternating current amperage, TRMS AC
Hz () 1Hz ~ AC ~ AC Current frequency
FUNC
Main DisplayAuxiliary DisplayMeasuring 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 KC 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
HzA DC+ AC TRMS
0/2 A~ AC TRMS HzAlternating 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
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
timeSubmenu/parameter (7-segment font)
1nFoMain 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 GmbH15
Initial Start-Up – Setup
Attention!
!
Note
3Initial 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.
16GMC-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 | LIGHTkey until0FF 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 GmbH17
Control Functions
230.00
V
050.00
AC
TRMS
Hz
U > 45 V:
V~
V
V
Te mp
TC
Tem p
RTD
hivolt
4Control 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
18GMC-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, , Hz5¾310,00028,000
V , V , A , A4¾31,0002800
3 nF ... 3 mF3¾3100280
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
FunctionDisplay
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 GmbH19
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 digitsZERO REL
> 200 D to (150,000 digits) 50% of the measuring rangeREL
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).
20GMC-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 GmbH21
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.
22GMC-I Messtechnik GmbH
ActivateBriefBlinksOnce
Save
(stabilized
measured
value)
Reactivate
Change to
Min-Max
V, A, Hz, dB,
F, %
V, A, Hz, dB,
1)
F, %
BriefSee table in section 4.4.1
> 10%
r MR
0L
< 10%
r MR
= 0L
ExitLong
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
StopLongare deleted
Press
DATA /
Min-Max
1
2 x shortare 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 GmbH23
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.
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.
... StorEStoreoffStArt
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.
24GMC-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.
storeonStoPstore
➭ 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
... StorEstore off StArt (blinks)
store CLEAr store CLEAr no yes
store empty (appears briefly) store
GMC-I Messtechnik GmbH25
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.
26GMC-I Messtechnik GmbH
Control Functions
GMC-I Messtechnik GmbH27
V/Hz, , Temperature, and A/Hz Measurements
5Measurements
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
28GMC-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 mV600 V
V
> 45 V:
> 600 V:
Warnings regarding dangerous voltage:
Max. 600 V (< 5 kHz)
V:
300 mV600 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 ... SETt iME ... CLIP
CLIp
➭ 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 GmbH29
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.
30GMC-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 GmbH31
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.
32GMC-I Messtechnik GmbH
Alternating Voltage Level Measurement (dB)
Note
U
1
U
2
VoltageLevel dB20
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 GmbH33
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
Hzt
E/tP
15 Hz to 1 kHz2 to 98%
Up to 10 kHz5 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.
34GMC-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 GmbH35
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 ... SETt iME ... bEEP
bEEPset:1, 10, 20 ... 300
in 10 Ohm steps
(10 = default setting)
36GMC-I Messtechnik GmbH
5.4 Diode Testing with Constant Current of 1 mA
Note
Attention!
!
COM
V
Tem p
Forward DirectionReverse 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 GmbH37
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
TCK (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 ... sett iME ... tempunit
unitset:°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.
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 GmbH39
” 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.
40GMC-I Messtechnik GmbH
V/Hz/dB – , Temperature, and A/Hz Measurements
5.7 Current Measurement
Notes Regarding Current Measurement
• The multimeter may only be operated with installed batteries or rechargeable batteries. Dangerous currents are otherwise not indicated,
and the instrument may be damaged.
• Set up the measuring circuit in a mechanically secure fashion, and
secure it against inadvertent breaks. Select conductor cross-sections and lay out connections such that they do not overheat.
•
An intermittent acoustic signal warns of current greater than 10 A.
An continuous acoustic signal warns of current greater than 16 A
• When measuring high current values, limit them to max. 16 A for
30 seconds or 10 A for max. 5 minutes, and allow the multimeter
to cool down for 10 minutes between measurements.
• For purposes of orientation, internal temperature in close proximity to the jacks is displayed at the right-hand auxiliary display
in the 3 A and 10 A or 16 A ranges. If temperature rises to
above 50° C, you are warned by an intermittent acoustic signal.
• The input for the current measuring range is equipped with a
fuse link. Maximum permissible voltage for the measuring circuit (= rated voltage of the fuse) is 600 V AC/DC. Use specified
fuses only! The fuse must have a breaking capacity of at least
30 kA.
• If the fuse for the active current measuring range blows,
“FUSE” appears at the digital display, and an acoustic signal is
generated at the same time.
• If a fuse should blow, eliminate the cause of overload before
placing the instrument back into service!
• Fuse replacement is described in section 9.3.
• 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
FunctionSwitch PositionMeasuring Range
Transformation ratio SEt menu, CliP=OFF
A DCA
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
FunctionSwitch Position
Transformation ratio SEt menu, CliPOFF
A DC V
A AC+DC / Hz (A AC)V
Hz (A AC) / A AC+DCHz
A AC / Hz (A AC)V~
Hz (A AC) / A ACHz
Scope of Functions, Current Measurement with Current Clamp Transformer
FunctionSwitch Position
Transformation Ratio SEt menu, CliPOFF
A DC A
A AC+DC / Hz (A AC)A
Hz (A AC) / A AC+DCA
A AC / Hz (A AC)A~
Hz (A AC) / A ACHz
GMC-I Messtechnik GmbH41
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
42GMC-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 GmbH43
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 M5 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 RangesClamp Types
300 mV3 V30 V
300.00 mA3.0000 A30.000 AWZ12C
3.0000 A30.000 A300.00 A
30.000 A300.00 A3000.0 A
300.00 A3000.0 A30000 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).
44GMC-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 ... SETt 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 RangesClamp Types
300 mV3 V30 V
300.00 mA3.0000 A30.000 AWZ12C
3.0000 A30.000 A300.00 A
30.000 A300.00 A3000.0 A
300.00 A3000.0 A30000 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 GmbH45
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 (Clip0FF) (see also section 6.4).
Current Clamp Setup Menu
... SETtiME ... 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: Clip0FF)
DMM Measuring RangesClamp Types
30 mA AC300 mA AC3 A AC *
30.000 mA300.00 mA3.0000 A
300.00 mA3.0000 A30.000 A
3.0000 A30.000 A300.00 A
30.000 A300.00 A3000.0 A
WZ12A, WZ12D,
WZ11A, Z3511,
Z3512, Z3514
46GMC-I Messtechnik GmbH
V/Hz/dB – , Temperature, and A/Hz Measurements
GMC-I Messtechnik GmbH47
Device and Measuring Parameters
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
6Device 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.
48GMC-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
QuerySet
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 GmbH49
Parameter
Addr
APoFF
bAtt50: bAtt – Query Battery Voltage
bEEP52: bEEP – Set Limit Value for Continuity Testing
beeper on/off
bt pin
caldat50: cALdAt – Query Calibration Date
CLEAr
CLiP44: Direct and Pulsating Current Measurement with Current Clamp Sen-
Com bt57: Interface Selection for METRA HIT ULTRA BT (M248B)
CoM ir57: Interface Selection for METRA HIT ULTRA BT (M248B)
dAtE50: dAtE – Query Date, 51: dAtE –Enter Date
EMpty
hyst
1nfo50: Querying Parameters – InFo Menu
irStb
1tEMP50: ItEMP intErn – Query Reference Temperature
nofil
0CCvP
rAtE
SEnd56: Activating the Interface
SET51: Entering Parameters – SETUP Menu
StArt
StoP
store
temp intern 50: ItEMP intErn – Query Reference Temperature
temp unit52: tEMP unit – Select a Unit of Measure for Temperature
t iME50: tiME – Query Time, 51: tiME – Set Time
trig54: triG – Trigger Conditions (parameters for memory mode operation)
tstore54: 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
1nFobAtt 2.9 V.
OCCUP – Query Memory Occupancy
1nFo
bAtt
...
0CCvP 000.0
%
dAtE – Query Date
1nFobAtt
... 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
1nFobAtt
... caldat20.06.12
vErSion – Query Firmware Version
1nFobAtt
... VEr0.22
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
50GMC-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 iMESET: 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
datESET: 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
APoFFSET: 10 ... 59 min on
(10 minutes = default setting)
See section 7.2 on page 57.
GMC-I Messtechnik GmbH51
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
bEEPSET: 1, 10, 20 ... 500
(10 = default setting)
tEMP unit – Select a Unit of Measure for Temperature
1nFo
... SET t iME ... tempunit°C
unitSET: °C / °F
(°C = default setting)
52GMC-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
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
hystset: 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 GmbH53
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:
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.
54GMC-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
trigset : sto-ou / sto-in / off
l_trigset : -150000 ... +150000
h_trigset : -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 .storeset : 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 GmbH55
Interface Operation
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
7Interface 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
... SEndStArt
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
... SEndsend /
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.
56GMC-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 irSymbol 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 btSymbol 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)
btCom bt
Switching from Bluetooth to IR:
1nFo ... SET t iME ... Combt
Com Set bt (flashes)
irCom 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.
Time formatDD.MM.YYYY hh:mm:ss
Resolution0.1 sec.
Accuracy1 minute per month
Temperature
influence50 ppm/K
Data Interface – Infrared
TypeOptical via infrared light through the
Data transmissionSerial, bidirectional (not IrDa compatible)
ProtocolDevice specific
Baud rate38,400 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 GmbH61
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 andauthentication 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 capacity16 MBit (2 MByte) for approx. 300,000
measured values with time stamp
Power Supply
Battery2 ea. 1.5 V mignon cell (size AA), alkaline
Service lifeWith alkaline manganese: approx. 200 hrs.
Battery testBattery capacity display with battery sym-
Power OFF functionThe 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.
62GMC-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 places309,999 steps
Overflow display“
Polarity display“–” (minus sign) is displayed if plus pole is
Measuring rate10 measurements per second,
Refresh Rate2 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 voltagewhich exceeds 600 V in the 600 V range:
intermittent signal (250 ms on, 250 ms off)
For currentwhich exceeds 10 A: intermittent signal
which exceeds 16 A: continuous
– For displayed temperature > 50 °C
Fuse
Fuse linkFF (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 categoryCAT IIICAT IV
Operating voltage600 V300 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 GmbH63
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 range0 C to +40 C
Operating temp. range TA–10 C ... +50 C *
Storage temp. range –25 C ... +70 C (without batteries)
Relative humidityMax. 75 %, no condensation allowed
ElevationTo 2000 m
Deployment
Indoors, except within specified ambient
conditions
* Exception: current > 10 A to 16 A, operation at up to 40 °C
Mechanical Design
HousingImpact resistant plastic (ABS)
Dimensions200 x 87 x 45 mm
(without rubber holster)
WeightApprox. 0.4 kg with batteries
ProtectionHousing: IP 52
Sockets: IP 20
Table Excerpt Regarding Significance of IP
Codes
IP XY
st
(1
digit X)
2 12.5 mm dia.0Not protected
5Dust protected2Dripping (at 15 angle)
64GMC-I Messtechnik GmbH
Protection Against
Foreign Object Entry
(2
IP XY
nd
digit Y)
Protection Against
Penetration by Water
Technical Data
GMC-I Messtechnik GmbH65
Maintenance – Calibration
Attention!
!
Note
Note
MEASURE
SETUP
FUNC
ENTER
9Maintenance 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
MessageFunctionMeaning
FUSE
0L
9.2 Batteries
Current measurement Blown fuse
In all operating modes Battery voltage has fallen below 1.8 V
MeasuringIndicates 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:
1nFobAtt: 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.
66GMC-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 GmbH67
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.
68GMC-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 GmbH69
Accessories
Attention!
!
Note
10Accessories
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 voltage600 V
Measuring category
Max. rated current: 1 A1 A16 A
With safety cap attached
Without safety cap——
1000 V
1000 V
CAT IVCAT IIICAT 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 humidityMax. 80 %
Pollution degree
70GMC-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.