10 GMC-I Messtechnik GmbH
4 General Operation
The test leads are connected to the “+” and “COM” jacks.
When measuring electrostatic
discharge capacity for floor
coverings, the shielded cable
should also be connected to
the COM and SHIELD jacks (KS-C
accessory set, “cable set con-
sisting of measurement cable
and high-resistance measure-
ment cable for measurements
in the Grange” (see diagram). Be sure to observe color coding.
4.1 Switching On, Monitoring and Switching Off
The instrument is switched on as soon as the rotary switch is
turned to any position other than OFF.
If battery voltage falls below the allowable limit value (U < 8 V), the
instrument cannot be switched on, or it is immediately switched
off.
Measurement cannot be started in the resistance measuring
ranges in the event of interference voltage.
The instrument is switched to the standby mode after 3 minutes,
if neither the rotary switch nor any keys have been activated dur-
ing this time.
A brief acoustic signal is generated before the instrument
switches itself off automatically with the rotary switch in a position
other than OFF. Moreover, 6 brief acoustic signals indicate every
10 minutes that the device is still on standby. The device should
be switched off by setting the rotary selector switch to OFF in
order to save (rechargeable) batteries.
The instrument can be activated once again by pressing the START
key.
The instrument can be switched off manually by turning the rotary
switch to the OFF position.
For purposes of transport and maintenance, we recommend turn-
ing the rotary selector switch to the OFF position in order to avoid
switching the test instrument on inadvertently.
Start-Up Test
When the instrument is switched on, i.e. as soon as the rotary
switch is turned to any position other than OFF, all LEDs light up
briefly: limit, caution, blown fuse, insulation resistance measuring
ranges, voltage measurement and scale illumination.
Optical Indicators
1Function testing should be executed at regular intervals (see following section re-
garding testing the LEDs).
KS-C
(Z541F)
+
COM
SHIELD
GUARD
LED Status Function – Cause
Limit value indication
–Measuredinsulation resistance does not violate the limit
value.
– Measured low-resistance Rlo does not violate the limit
value.
Limit value indication
– Measured insulation resistance has fallen short of the limit
value.
– Measured low-resistance Rlo has exceeded the permissible
limit value.
Detection of interference voltage in the off state 1
If dangerous voltage of greater than 50 V is present at the measure-
ment inputs:
– Initialization of the insulation resistance and
low-resistance measurements is disabled.
– Presence of test voltage is indicated.
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