Chauvin Arnoux C.A 742 Notice De Fonctionnement page 26

„ If every third indicator is off, there is a problem with the
leads. Check that they are correctly connected and that
they are actually touching, then press the AUTO TEST
button again. If the problem persists, the lead and/or the
test probe must be replaced.
„ If no indicator lights, replace the batteries (see §4.2). If the
problem persists with new batteries, the device is defective
and must be sent in for repair (see §4.4).
After each check, perform a self-test in order to confirm the
proper operation of the device.
In a noisy environment, make sure that you can in fact hear
the audible signal emitted by the device.
Remark: If the AUTO TEST button is kept pressed for
more than 10 seconds when the test probes are
not touching each other, the device switches to
standby.
2.2. VOLTAGE DETECTION
Connect the red test probe to the + terminal and the black
lead to the COM terminal.
Keep your hands behind the guards of the device and of
the test probe.
Position beyond which your hands must not go.
Place the test probes on the element to be tested and main-
tain a firm contact.
There is no need to switch the C.A 742 on, because it starts
up automatically.
+
600V
CAT IV
230
127
50
24
V
AC
DC
12
26
COM
690 AC
400
750 DC
Ph
Ω
ELV
+
-