Buzzer; Using The Ez365 - Martindale Electric EZ365 Instruction Manual

If the EZ365 does not perform the self-test and none of the
indicators illuminate this could mean the supply voltage is less than
40V (see section 1.2 Precautions). Verify the EZ365 in a known
correctly wired socket.
If any indicators do not illuminate, or do not illuminate in the above
sequence or the buzzer does not emit a continuous tone, then do
not use the EZ365 and return it for repair.

3.3 Buzzer

Table 1 shows the buzzer response for the various wiring and RCD
test conditions.
Table 1.
Continuous tone
Fast pulsed tone
Pulse repetition frequency 6Hz
Slow pulsed tone
Pulse repetition frequency 3Hz
Pulsed tone increasing to
continuous tone

3.4 Using the EZ365

Plug the EZ365 into the socket to be tested.
Verify that the EZ365 performs its self-test routine correctly (see
section 3.2) then simply compare the status of the flashing indicators
with the front decal or with figures 1, 2 & 3 in sections 3.3.1 and 3.3.2.
If the EZ365 does not power up and perform its self-test and none
of the LED's illuminate this could mean that the wiring is incorrect,
or the mains voltage is less than 40 V and investigation of the wiring
is required. In such circumstances verify the EZ365 in a known
correctly wired socket to confirm the need for investigation.
Wiring correct, loop impedance <10Ω
Wiring correct, loop impedance
between 10Ω and 500Ω
Faulty wiring
Supply voltage out of tolerance
RCD did not trip following RCD test
RCD trip test will be activated in 2
seconds
5