Chauvin Arnoux AEMC Instruments C.A 771 IP2X Notice De Fonctionnement page 32

L1
L2
L3
N
PE
„ If the voltage is less than 50 V
„ Otherwise, indicator lights L1-L2-L3 and L1-L3-L2 flash alternately.
When the C.A 771 emits two high-pitched beeps, move the red test probe to the last
phase of the system. The device indicates the voltage that is present.
L1
L2
L3
N
PE
If there is a problem, i.e. if the device does not detect a phase change within 10
seconds or if the phases are not balanced, it indicates an error by emitting two
low-pitched beeps.
Otherwise, the device indicates the phase order by lighting up:
„ the L1-L2-L3 indicator light and emitting a low-pitched beep followed by a
high-pitched beep,
„ or the L1-L3-L2 indicator light and emitting a high-pitched beep followed by a
low-pitched beep.
2.7. LOAD SWITCHING
During voltage detection, if there is an interference voltage near the element being
tested, the device may indicate the presence of an operating voltage when in fact
there is none.
If this voltage is < 400 V, press the two buttons
voltage from an operating voltage. If it is an interference voltage, the voltage indica-
tion disappears while the buttons are being pressed.
On systems equipped with 30 mA differential circuit breakers, they can be triggered
by pressing these two buttons.
Place the + test probe on the phase, and the black test probe on the protection
conductor, where these two conductors belong to the circuit protected by the dif-

or dc, it cannot be measured.
ac
+
1400
1000
V
690
AC
DC
400
230
100Ω
Ph
127 2kΩ ELV
+ -
50
60kΩ
24
300kΩ
L1-L2-L3
12
L1-L3-L2
32
to distinguish an interference
30mA