5.2.3 Resistance Difference Measurement
The difference between the wire resistances of a pair is usually small
compared to the wire resistances. KMK 8 has to measure the small
difference of high resistances, therefore the calibration of test leads is
recommended.
Test Procedure
Select the RESISTANCE DIFFERENCE mode and press ENTER and
then the measuring arrangement appears.
This measurement is implemented as a Murray measurement. The far
ending of the tested pair should be joined manually or by means of the
remote controllable loop-closing device KLC 8.
Two measuring modes are provided: Sensitive or Protected mode.
It is recommended to start the measurement with sensitive mode. When
the interference voltages overload the indicator a warning appears
informing the user that the result can be inaccurate. In that case the
measurement should be repeated in protected mode.
• Select the proper mode with the MODE (F3) key
• Start the measurement with the START/STOP key
Having the measurement completed the test results appear.
Displayed Test Results
• Rl = Ra+Rb loop resistance
• ∆R = Ra-Rb resistance difference
• 2 ∆R / Rl (in %)
• Ra and Rb calculated of Rl and ∆R
To save the test result press the SAVE (F1) key.
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