15
5. Continuity / resistance measurement
IMPORTANT
The continuity test will auto-range from 0.01Ω to 99.9kΩ. Circuits up to 2Ω will be tested at >200mA.
To change the test current, go to section 10 – Setup.
The continuity test is automatic. The test starts as soon as the leads are connected to a circuit. The TEST button is ONLY
used to null the lead set.
Warning: Prior to any continuity testing, ensure the circuits under test are isolated and not live.
SETUP allows the following configuration options:
■
Positive test current
■
Bi-Directional test current
Bi-directional test current allows the automatic testing of the circuit in both directions and the highest measured value
being displayed See section 10 SETUP OPTIONS.
5.1
Nulling test lead resistance (up to 9.99ohms)
W
Before starting a continuity test, the test lead resistance should be nulled such that it does not add extra resistance to the circuit being
measured. Once nulled it does
not need
repeating for each test. Periodically it should be checked to ensure nothing has changed.
The “Lead Null” value is retained even when the tester is switched off.
To null test leads:
.1 Short test probes or clips together and press the TEST button. The null symbol
will be displayed to indicate lead null is
active.
This null value is stored until the TEST button is pressed again.
.2 To cancel the LEAD NULL, separate the test leads and press the TEST button.
Lead null OFF
Lead null ON
