15
test should be performed with the leads shorted together or the battery
test mode should be selected to ensure the batteries are in good working
condition.
MIT310A Test lock
The [TEST] button can be locked down to allow continuous continuity or
insulation testing.
To enable the TEST LOCK:
1. Press and hold down the [TEST] button. Press the
L button
momentarily.
2. The TEST LOCK LED
L should light.
To remove TEST LOCK:
1. Press the [TEST or LOCK] button.
2. Wait for the reading to stabilise and adjust the lead null knob z until
the display pointer indicates 0 Ω.
3. Lead null should be checked periodically and at the start of each session
to ensure ZERO is maintained, or adjusted as necessary.
Note: Lead null can remove up to 0.5 Ω of lead resistance.
Continuity test (MIT310A)
Continuity range extends from 0.00 Ω to 2 kΩ.
Ranges are not auto-ranging. Manual selection of each range is necessary.
Test cur
rents are: 200 mA to 2 Ω, 20 mA to 20 Ω, 2 mA to 200 Ω,
200 µA to 2 kΩ.
To make a continuity measurement:
1. Select the continuity range required.
2. Connect the test leads to the circuit under test.
3. For a single test press and hold down the [TEST] button.
4. Read the resistance from the appropriate range scale.
T
o increase battery life release it as soon as possible after a test is
complete.
Continuity buzzer test
It is best to lock the test button down: press and hold down the test
button. Press the lock button momentarily.
Insulation testing
Insulation testing is the same as page 13, however the result is only
displayed as long as the [TEST] button is depressed.
Note: If the batteries are exhausted the instrument may not show a
needle movement when testing. We recommend an occasional insulation
MIT300_UG_en_V11.qxp 14/1/09 3:03 pm Page 15
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