Measurement In Non-Inductive Resistance Mode - Chauvin Arnoux C.A 6250 Manual De Instrucciones

C = check of connections
0 = measurement of residual voltage (stored).
1,2,3...n = successive measurements of the voltage on the terminals of the resistance (interval
between two measurements: 120 ms).
The delay stated for the first measurement (1,200 ms) is an indication only; it can vary according to
the load measured.
Remarks:
If the range is exceeded, the instrument displays Err 07.
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The source of current is protected against overheating. If a measurement at 10 A lasts too long (>
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several tens of seconds) and causes a temperature rise, the current is cut off and the instrument
displays Err 05. The instrument must be allowed to cool down before another measurement can
be made.
After a measurement cycle, the instrument automatically discharges the inductance completely.
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During this discharging, the instrument displays the following icon:
Never touch or disconnect the leads before the icon disappears.

3.2.2 Measurement in non-inductive resistance mode

This mode is used to measure contact resistances, bondings, and, generally, any resistance having a
time constant shorter than a few milliseconds.
The measurement is started by pressing START and stops automatically as soon as the
measurement result is available. START must be pressed again to make another measurement.
Description :
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- press the START key.
- automatic check of connection of the "current" and "voltage" wires: if the connection is incorrect, an
error message is displayed (Err 11 if the "current" wires are incorrectly connected, Err 12 if the
"voltage" wires are incorrectly connected); the instrument switches to standby; the cycle is resumed
when the connection is correct.
- current not established, measurement of residual voltage Uo on the terminals of the resistance. If
this voltage is too high, the instrument displays Err 13.
- establishment of current I.
- measurement of the voltage on the terminals of the resistance U1 then cutoff of the current.
- display of the measurement R = (U1 - Uo) / I
- automatic stop at the end of the measurement. The instrument, in standby, is ready for another
measurement.
Operating diagram (Example: two measurement cycles)
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C = check of connections
0 = measurement of the residual voltage.
M = measurement of the voltage on the terminals of the resistance.
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