Measurement Of Resistance; Fault Indications - PCE Instruments CHAUVIN ARNOUX C.A 6421 Mode D'emploi

Do not forget to connect the earth connection again after the test.

3.2 MEASUREMENT OF RESISTANCE

The instrument can also measure resistances under 1 kΩ.
Diconnect the resistance from any voltage source.
1. Short the S and H terminals using the bar 4 .
2. Connect the E and H terminals to the resistance to be measured.
3. Press the pushbutton 11 till you read the measurement Make sure none of the three
indicators is blinking; otherwise check the connection (see § 3.3: FAULT INDICATIONS) and
repeat the measurement.
N.B: With very low earth resistances, you must consider test lead resistance (about 22.5 mΩ
per meter, for the test leads supplied as accessories).

3.3 FAULT INDICATIONS

I Galvanometer pointer
If the pointer stops on the right side, this indicates that you measured more than 1000 Ω
(overranging condition) or that the circuit is open.
If the pointer stops on the left side, this indicates that you measured less than .5 Ω . This may
also indicate that the H and E rods, or the S and E rods, were inverted.
Check the connections.
I Indicator 6 on
Battery condition is permanently checked during the measurements. If this is the first time the
battery indicator comes on, you have twenty minutes battery time left.
Change the batteries quickly. See § 5.1.2.
I FAULT indicator 8 blinking
There is a fault in the current circuit (E - H). It may result from:
- current circuit resistance too high between E and H
- low measurement condition (R < 0,5 Ω)
- open fuse
Check the rods, the leads, the connections and the fuse (see § 5.1.3).
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