Operation Manual

12 GMC-I Messtechnik GmbH
4 General Operation
The test cables are connected to the “+” and “COM” jacks.
The shielded cable should also be connected to
the COM and SHIELD jacks for the measurement of
electrostatic discharge capacity at floor cover-
ings. (Accessory equipment KS-C „Cable set
consisting of measurement cable and high-resis-
tance measurement cable for METRISO C, for
measurements in the G range“, see connection
diagram). Observe color codes when connecting
the cables!
4.1 Automatic Settings, Monitoring and Shutdown
The instrument cannot be placed into operation, or it is shut down automatically, if
battery voltage has fallen to below the lower limit value.
Measurement is automatically interrupted and/or the measuring function is dis-
abled if voltage exceeds the allowable limit in the resistance range (U > 25 V).
The instrument switches itself off automatically, at the earliest after the
current (automatic) measuring sequence has been completed, and after
the predefined on-time has elapsed (see chapter 3.4). On-time is reset to
the duration selected in the setup menu each time a key is activated.
Lamp Functions
4.2 Measurement Value Display
The following is displayed at the LCD:
• Measurement values with abbreviated quantity type and units of
measure
• The selected function
When automatic measuring sequences are used, the measurement
values are displayed in digital format until the next measuring sequence is
started, or until the instrument switches itself off automatically.
If the measuring range upper value is exceeded, the upper value is displayed pre-
ceded by the greater than symbol “>” in order to indicate over-ranging.
4.3 Online Help
Appropriate online help texts can be displayed at the LCD for each of the
basic functions and sub-functions, after the respective function has been
selected in the corresponding menu.
Ð Press the
key to query online help.
Press any key to exit the help function.
Lamp Status Function
red
Potential difference  150 V
between finger contact and measurement input
Netz
Mains
blinking red
Line voltage or interference voltage is present at the measurement inputs
(insulation resistance and low resistance measurement are disabled)
LIMIT
red
– Measured insulation resistance is less than the selected limit value.
– The measured low-value resistance is less than the allowable
limit value.
U>25V
red
A voltage of greater than 25 V is present at the measurement inputs.
The discharging process is not yet complete.
COM
SHIELD
+
KS-C
(Z541F)
i