Activation/Deactivation Of The Alarm Thresholds; Triggering Of The Alarm; Relative Measurements (∆Rel); Programming The Capacitance Per Unit Length (C.a 6531) - Chauvin Arnoux C.A 6531 Notice De Fonctionnement

If the threshold has been "wrongly" programmed, it is
corrected when it is stored in the memory: For example, 002
MΩ will become 2.00 MΩ.

4.5.2 Activation/deactivation of the alarm thresholds

The threshold corresponding to the switch position can be
activated by a short press on the ALARM key.
The ALARM symbol, the < or > symbol, the programmed value
of the threshold and the corresponding unit are then displayed
on the digital threshold display.
The threshold can be deactivated by a second short press on
the key. The ALARM symbol, the < or > symbol, the programmed
value of the threshold and the corresponding unit disappear.
If the ∆ ∆ ∆ ∆ ∆ REL function is on and you activate a threshold, it will
apply to the absolute value of the value displayed.

4.5.3 Triggering of the alarm

Examples in insulation measurement:
If an upper threshold of 100 MΩ Ω Ω Ω Ω is active, the display
indicates "ALARM > 100.0 MΩ".
If the measurement exceeds this value, a continuous beep
will be triggered and the whole digital threshold display will
flash.
If a lower threshold of 100 MΩ Ω Ω Ω Ω is active, the display
indicates "ALARM < 100.0 MΩ".
If the measurement falls below this value, a continuous beep
will be triggered and the whole digital threshold display will
flash.
Relative measurements (∆ ∆ ∆ ∆ ∆ REL)
4.6
Pressing the ∆REL key enables you to store the value measured
in the memory.
The measurements that follow are differences compared with
the value in memory. These differences may be positive or
negative. The ∆REL symbol is displayed.
Another press clears the value from the memory and returns
the instrument to normal mode.
This key can be used at any time except in voltage mode
on the MΩ Ω Ω Ω Ω positions.
4.7 Programming the capacitance per unit length
(C.A 6531)
When the switch is set to nF, a long press on the
the programming mode for the capacitance per unit length of
the line to be measured. The value in memory is displayed on
the digital threshold display along with the nF/km symbol.
If no value was programmed previously, the display indicates
50 nF/km by default. It is then possible to modify the value
present (see § 2.2.3).
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key activates