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2.3.4. Key (C.A 6523 and C.A 6525)
When programming the alarm thresholds, the key can be
used to scroll through the possible values, which flash, and then
loop back to the beginning :
■ MΩ or GΩ for insulation, kΩ or Ω for resistance, for the
measurement units,
■ 1,2, 3 or _ for the thousands digit,
■ 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 for the hundreds, tens and units,
■ “-.- - -” or “- -.- -” or “- - -.-” or “- - - -” for the decimal separator,
■ > or < for the upper or lower threshold.
2.3.5. Key (C.A 6523 and C.A 6525)
When the key is pressed, the backlighting of the display comes
on. It will be turned off automatically one minute later. When it is
lit, you can turn the backlighting off by pressing this key again.
2.3.6. TIMER key (C.A 6525)
This key can be used to activate/deactivate timed insulation
measurement.
3. MEASUREMENT FUNCTIONS
3.1. Insulation
The insulation measurements correspond to the MΩ positions
of the switch.
3.1.1. Safety checking
The insulation measurement shall be performed when the
equipment is idle. The apparatus nevertheless automatically
detects and indicates the presence of a voltage on its terminals.
If the voltage present is less than 25 V, the insulation can be
tested, but the lower the test voltage (250 V, 500 V or 1000 V)
the greater the possibility of error.
If the voltage is greater than 25 V, “ > 25 V “ is displayed.
Pressing the yellow key does not trigger insulation measurement,
but causes a series of buzzes (buzz, buzz, buzz, ...) and makes
the symbol flash until the yellow key is released. These
warnings only end if the voltage falls below 25 V (disconnect
the apparatus and neutralise the voltage which is present on
the network to be measured) or if the yellow key is released or,
naturally, if you turn off the instrument by returning the switch to
the OFF position.
Should the voltage be greater than 600 V, the digital display
will indicate "
OL
".
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