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 G
range” (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
1
Function 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
–
Measured
insulation 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.
Limit
Green
Limit
Red
!
Red
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