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14 GMC-I Messtechnik GmbH
4 General Operation
The test leads are connected to the “+” and “COM” jacks.
Measuring High-Value Resistance with the KS-C Probe (Option)
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 GΩ range”, see diagram). Be sure to observe color coding.
For measuring with the Test Probe for Remote Triggering (Option Z550A)
see section 14.5.1.
4.1 Switching On, Monitoring and Switching 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 external voltage.
The instrument only switches itself off automatically after comple-
tion of an automatic measuring sequence, and after the predeter-
mined on-time has expired (APOFF parameter in SETUP switch
position, see page 12). On-time is reset to its original value as
defined in the setup menu, as soon as any key or the rotary func-
tion switch is activated.
If the instrument is switched off automatically with the rotary
switch in any position other than OFF, it can be reactivated by
pressing the stby OFF key.
The instrument can be switched off manually by turning the rotary
switch to the OFF position.
Optical Indicators
1
Prerequisite: The LiLEd parameter is set to on (see page 13).
2
Function testing should be executed regularly (see following section on testing
LEDs).
+
C
O
M
S
H
I
E
L
D
KS-C
(Z541F)
LED Status Function – Cause
Limit value indication
1
Measured insulation resistance does not violate the limit
value.
– Measured low-resistance Rlo does not violate the limit
value.
Limit value indication
1
Measured insulation resistance has fallen short of the se-
lected limit value.
Measured low-resistance Rlo does has exceeded the per-
missible limit value.
External voltage when on or off (not M550N) and during discharge
2
Dangerous voltage of greater than 50 V is present at the mea-
surement inputs:
Initialization of the (insulation) resistance and
low-resistance measurements is disabled.
The discharging cycle has not yet been completed,
e.g. residual voltage at capacitive devices under test
Test/Measuring voltage with device switched on
Dangerous voltage of greater than 50 V is present at the mea-
surement inputs.
LCD Status Functions
Display
External voltage when off, and during discharge
Dangerous voltage of greater than 50 V is present at the
measurement inputs:
Initialization of the insulation resistance and
low-resistance measurements is disabled.
Test voltage applied during insulation measurement
The discharging cycle has not yet been completed,
e.g. residual voltage at capacitive devices under test
Limit
Green
Limit
Red
!
Red
14


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