Selection Of The Measurement Mode : Key; Measurement In Inductive Resistance Mode - Chauvin Arnoux C.A 6250 Manual De Instrucciones

4. If desired, press the ALARM (
5. Connect the measuring cords to the instrument, then to the resistance to be measured.
6. The instrument indicates ST BY (standby). Press START to start the measurement and, if applicable,
STOP to stop it (this depends on the measurement mode selected).
Remark: Changing ranges during a measurement stops the measurement cycle; the instrument
returns to standby (ST BY).
7. The instrument displays the measurement result.
8. Then press MEM to store the result and validate by pressing again.
For a detailed description of result storage, see § 3.5.
3.2 SELECTION OF THE MEASUREMENT MODE :
There are three measurement modes :
- Inductive resistance measurement :
- Non-inductive resistance measurement :
- Non-inductive resistance measurement with automatic triggering :
The measurement mode is selected by successive presses on the
is displayed bellow, in the centre of the display unit.

3.2.1 Measurement in inductive resistance mode

This mode is used for measurements on transformers, motors and other inductive devices.
The measurement is started by pressing START and stopped by pressing STOP.
I Description :
- 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, maintained for as long as the instrument does not return to "standby".
- measurement of voltage U1 on the terminals of the resistance and display of the measurement
R = (U1 - Uo) / I.
- any subsequent measurement involves the measurement of Un only, since Uo is kept in memory
the cycle is ended by pressing the STOP key.
I Operating diagram :
OPER
STBY
I
C
MES
100ms
640ms
+ R(θ)) key to activate the alarm(s).
0
1200ms
30
key; the mode selected
1 2 3
n
120ms
KEY