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20 GMC-I Messtechnik GmbH
8 Measuring Low-Value Resistance (up to 10 Ohm)
– R
LO
Function
According to the regulations, the measurement of low-value resis-
tance at protective conductors, earth conductors or equipotential
bonding must be performed with (automatic) polarity reversal of
the test voltage, or with current flow in one or the other direction.
Attention!
!
In the measuring function R
LO
, measurements are per-
formed with currents about 200 mA.
Please check before measuring whether your DUT or
your circuit is designed for these high current values.
Connection
Note
Low-value resistance can only be measured at voltage-
free objects.
Ð Connect the device under test to the + and COM jacks.
Ð Select the Rlo measuring function with the rotary switch.
Attention!
!
The measurement cannot be started until the test probes
are in contact with the device under test.
If voltage is present at the device under test (U > 10 V),
the display is switched to voltage measurement. The dis-
play is not returned to low-resistance measurement until
voltage is less than approximately 8 V. If resistance is
greater than 10 Ω, OL pears at the display.
+
COM
R
LO
+ COM SHIELD
R < 10 Ω
R
LO
Rx
0V !
!
R
LO
AUTO
Ω→
¬Ω
---
Rlo
START
ENTER
20


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