Power Probe PPCT - Continuity Tester - Manual (Page 5)

5
Isolated Circuit
Flex wire to test contact
Continuity Testing
When you plan to test continuity of a circuit it
is best to fi rst isolate the circuit. This eliminates
backfeed from parallel circuits which can lead to
a misdiagnosis.
Tones
The three tones of the SCT alert you to the
resistance level of a circuit.
1.
LOW pitched tone indicates continuity of
a circuit under 10 ohms.
2.
HIGH pitched tone indicates continuity
of a circuit over 10 ohms but under
1 K ohms.
3.
WARBLE tone indicates a voltage from
6-24 volts.
Testing a Wire for Continuity
When checking continuity of a wire the low pitched
tone should sound indicating a good connection. If
the high pitched tone sounds the circuit resistance
is in excess of 10 ohms and may need closer exami-
nation of the connections.
Wiggle Test
While measuring circuits we suggest you fl ex or
wiggle the suspected wire and listen for a change
in tone. If there is a change in the tone while you
are fl exing or pulling the wire, you have a faulty
connection and should examine it closer and repair
it. A Wiggle Test is a great method to test and pin-
point both intermittent and short circuits.
Flex and Wiggle Test
Low Tone High Tone Warble Tone
<10
>10 <1k 6-24Volts
No Tone Tone
Non-isolated Circuit
Application Application