User Manual
GMC-I Messtechnik GmbH 15
Adjusting Cable Resistance
Ð After selecting a resistance thermometer, the
measurement display is accessed by pressing the key.
Ð The menu for cable resistance adjustment is opened by
simultaneously pressing the and keys. Rlead and
temp are displayed.
Ð The decade (i.e. the position of the digit to be changed) is
selected with the keys, and the respective digit is
set with the keys.
Ð The menu is exited upon acknowledging the last digit by
pressing the key, whereupon the measuring display
returns. The cable resistance value remains in memory.
The default value is 0.1 . Entry is limited to a range of 0
to 50 .
Note!
The selected cable resistance value remains
unchanged after exiting the function, and when the
instrument is switched off.
11 Insulation Resistance Measurement [M@...V]
(METRA HIT 27I and METRA HIT H+E
CAR only)
11.1 Preparing for Measurement
Note!
High-resistance measurements
In the event of extremely high resistances the
capacitive influence of the person performing the
measurement and/or the measuring cable may
distort the measured value. Use therefore short or
shielded measurement cables.
The measurement cables may not come into contact
with one another during high-resistance insulation
measurements.
Ð Set the rotary selector switch to “M@50V”, “100V”,
“250V” or “500V”, depending upon the desired test
voltage.
Ð Connect the DUT as shown on the next page.
Note!
Interference voltage
The rotary selector switch may only be set to
M@...V for insulation resistance measurement
(not for voltage measurement).
However, if interference voltage is inadvertently
applied with the switch in this position, it is displayed
at the bottom left. Insulation resistances may only be
measured on voltage-free objects.
If an interference voltage of 50 V is present, insulation
resistance measurement is disabled. The LCD continues to
display the interference voltage value. If a voltage of greater
than 610 V is present, an acoustic signal is generated as well.
m
S+S–
VC
RTD
see chapter 14
Measuring Range:
- - - - -
V
-000 250 V
M@
50 ... 500V
10.29
V
023 250 V
M
Selected Test Voltage
Displays test voltage
as long as key is depressed
R
ISO
FUNC MAN
+
FUNC
Continuous
Measurement
Measuring voltage
/Residual voltage
approx. 2% accuracy
Nominal/
test voltage