4
GMC-I Messtechnik GmbH
2.2
Operation and OLED Display
1 Graphic OLED display
2
START
key:
–
Switch on
:
Press and hold until the display
lights up.
–
Start measurement
:
Press and hold until measurement
starts. Briefly pressing starts mea-
surement if voltage is applied to the
test probes (exception for Uc: is dis-
played immediately after voltage is
applied).
–
Measurement point illumina-
tion
:
Press briefly to switch illumination
on and off.
–
Switch off
:
Press twice briefly to switch the
instrument off.
3
FUNC
key for selecting the following
measuring functions:
Uc, TIME,
I
4
I
N
key for selecting nominal
residual current
5
TYPE key:
–
Uc function
:
RCD Type Selection
– TIME function
:
Selection of waveform and initial polarity of the residual current, as well as
RCD type
– I function
:
Selection of waveform and initial polarity of the residual current
6
xI
N
key
– Uc function
:
Selection of the touch voltage limit value
– TIME function
: selection of a multiplier for nom. residual current
Figure 2.3:
Control Panel and OLED Display
Figure 2.4:
Example of Displayed Information
The information which appears at the display varies depending on
the selected function.
2.3
Initial Start-Up
After inserting the batteries in accordance with section 5.1 on
page 9, the measuring instrument is ready for operation.
3
Performing Measurements
3.1
Switching the Instrument On and Off
The instrument is switched on by pressing and holding the START
key. Briefly press the START key twice in order to switch the
instrument off, during which no voltage may be applied to the test
probes! The instrument is switched to the standby mode after
several seconds (reduced brightness), if none of the keys has
been pressed and no voltage is applied to the test probes. The
instrument is switched out of the standby mode (i.e. back to full
brightness) by pressing any key or applying voltage to the test
probes. The instrument is shutdown automatically if it has
remained inactive for about 1 minute, i.e. if no keys have been
pressed and no voltage has been applied to the test probes dur-
ing this time.
3.2
Instructions and Principles with Validity for
All Measurements
Setting Parameters
The desired functions or parameters are selected with the
FUNC
,
I
N
,
TYPE
and
xI
N
keys (see section 3.3). Measurement is trig-
gered by pressing the
START
key. All selected functions or param-
eters remain valid until they are changed.
Interference Voltage
If (interference) voltage of less than 190 V or greater than 255 V is
applied to the test probes, corresponding information appears at
the display. If this is the case, the START key is disabled.
Blown Fuse
If line voltage is applied to the test probes, and if the fuse is either
blown or has not been inserted, this is indicated at the display.
Figure 3.3:
Blown Fuse Display
The fuse must be replaced as described in section 5.1.3.
Note
If a voltage within a range of 25 to 190 V is applied to the
test probes, the blown fuse symbol is also displayed at
the instrument even if the fuse is OK. For this reason,
make sure that voltage in the measured electrical circuit is
really less than 190 V before replacing the fuse.
Prerequisites for RCD Measurement
•
If a voltage within a range of 190 to 255 V is applied to the test
probes, the TRMS value appears at the display and measure-
ment can be triggered by pressing the
START
key.
Figure 3.4:
Example of a Voltage Measurement
•
For safety reasons, the test instrument first determines
whether or not touch voltage Uc is higher than the selected
limit value each time the
START
key is pressed before measur-
ing RCD parameters. If the limit value is exceeded, this is indi-
cated at the display and the measurement is ended.
3
1
2
4
5
6
Battery Display
Measuring
I
N
and
Temperature Display
RCD Type
Ancillary
Main
Reading
Function
I
N
Value
Multi-
pliers
Waveform
Figure 3.1:
Display of (Inter-
ference) Voltage
< 190 V
Figure 3.2:
Display of (Inter-
ference) Voltage
> 255 V
