GMC-I Messtechnik GmbH
5
Automatic Shutdown
After switching the device on, “
APO
” appears
at the LCD (automatic power off). The device
is switched off automatically after 10
minutes if none of its keys have been
activated during this time.
Disabling Automatic Shutdown
The instrument can be set to continuous
operation.
➭
Press the
NOT AUTO POWER OFF
key to this
end.
4
Operation
Attention!
!
For reasons of safety, use the
instrument on electrical circuits with
less than 500 V only. Be sure to
ascertain the voltage level of the
circuit to be measured before starting
the instrument.
Do not activate the
0 SET
key with open
current clamp. This may lead to erroneous
measurements.
Do not apply direct currents of more than
1.5 A. This may result in measurement error
and damage to the device.
4.1
Using the METRA
CLIP
63
Current Clamp
Opening and Closing the Clamp
➭
Press the
locking lever
down in order to
unlock the device.
➭
Press the
slider
down in order to open
the clamp.
➭
Press the
slider
up in order to close the
clamp.
➭
Slowly press the
locking lever
up in order
to securely lock the clamp.
Note!
Correct measurement is only
possible when the current clamp is
fully closed.
Figure 1: Operation,
METRA
CLIP
63
4.2
Direct Current Measurement
➭
Connect the current clamp to the
CT INPUT
socket at the measuring
instrument.
➭
Press the
POWER
key. At first, the 100 mA
measuring range is
displayed.
➭
Select a suitable measuring range at the
measuring instrument with the
Range
key.
➭
Position the current clamp in proximity to
the conductor to be measured and fully
close it.
➭
Press the
0 SET
key in order to execute
zero balancing.
The “0” display may be unsteady due to
geomagnetism or external magnetic fields,
but this condition does not indicate
malfunctioning.
If the measuring range is changed, zero
balancing must be executed again.
➭
Open the current clamp and close it
around the conductor to be measured.
➭
Make sure that the direction of the arrow
on the current clamp corresponds with
the flow direction of the current to be
measured.
Locking
Lever
Slider
Slider
Locking
Lever
Open
Close
