Insulation Testing; Continuity Measurements - Chauvin Arnoux C.A 6521 Notice De Fonctionnement

5.1. Insulation testing

(see § 10.1 Examples of applications)
■ Start up the instrument by setting the switch to MΩ which
will provide the required voltage.
■ Connect the lead from the " + " terminal to the cold point and
the lead of the " - " terminal or the remote control probe of
the C.A 6523 or C.A 6525 to the hot point.
■ The instrument first checks that there is not a dangerous
voltage between its terminals (see § 3.1.1).
■ On the C.A 6523 et C.A 6525, the user can control the dis-
play backlighting by pressing the key
■ Then press the yellow key, keeping it pressed down until the
measurement is displayed. The yellow key on the C.A 6523
and C.A 6525 remote control probe acts in exactly the same
way as the yellow key on the instrument (see § 3.1.2).
■ Read off the displayed value. If the digital value varies greatly
for high values (> 500 MΩ), then the load is highly capacitive.
If this is the case, read the measurement off the bar graph.
■ After the measurement, let go of the yellow button and wait
a couple of seconds whilst the test mechanism discharges
(voltage < 25 V) before disconnecting the leads.
On the C.A 6523 and C.A 6525, an alarm threshold can be
activated using the ALARM key (see § 4.5).
On the C.A 6525, you can perform timed measurement using
the TIMER key (see § 4.7).

5.2. Continuity measurements

■ Start up the instrument by setting the switch to 20 Ω +.
■ On the C.A 6523 and C.A 6525, it is possible to compensate
for the resistance of the measurement leads (see § 4.6).
■ Connect the + and - leads to the measurement points.
■ On the C.A 6523 et C.A 6525, the user can control the dis-
play backlighting by pressing the key
■ Note the first value displayed (see § 3.2).
■ Then set the switch to the " 20 Ω - " position.
■ Note the second value.
■ Then calculate the mean of the two values to obtain an ac-
curate result (this continuity measurement mode with a cur-
rent circulating in two different directions, 20 Ω + et 20 Ω -, is
mainly interesting when there are self-inductive or capaci-
tive elements in the circuit to be tested).
Inductive load measurements are limited to 4 H, beyond
which the device risks being damaged.
On the C.A 6523 and C.A 6525, an alarm threshold can be
activated using the ALARM key (see § 4.5).
.
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