Live Circuit Warning
When more than 25V (10V on 10V insulation range) is applied
to the terminals in the insulation ranges, the instrument defaults
to a voltmeter and gives an audible warning if a test is
attempted.On all other switch positions except OFF/V when
approx 10V is applied the default voltmeter will be activated.
Testing will be inhibited.
Voltage Testing on High Energy Systems
Use extreme care when using or measuring voltages above
30V, particularly in high energy systems. Fused test leads are
available as optional accessories for local situations where
increased protection is required.
Auto-shut Off
To conserve battery life, Auto-shut Off (preceded by a series of
bleeps) operates after approx. 10 minutes of instrument
inactivity on insulation, 5 minutes on all other ranges. If the
instrument is switched on whilst holding the
key, the
Auto shut-off time is extended to 60 minutes. To restore
operation after Auto-shut Off, either select OFF followed by the
required switch position.
Note: It is recommended that the instrument is switched to the
OFF position when not in use.
Backlight
The backlight is activated by pressing the
key. The
backlight will remain illuminated for approx. one minute before
automatically switching off to conserve battery life, alternatively
the
key can be re-pressed.
Insulation Tests (M
Ω
) (See fig. 1)
The insulation tests apply a known voltage to the circuit under
test and measure the resulting leakage current. The circuit
under test must be completely de-energised and isolated
before test connections are made.
Insulation tests are only initiated when the TEST button is
pressed.
1. Set the range switch to the test voltage required.
2. Connect the test leads, first to the instrument, and then to
the isolated item under test.
3. Press
the
TEST button to activate the test voltage. Take
the reading.
4.
Release the TEST button at the end of the test.
5. Any capacitive circuits charged during a test will automatically
discharge. If significant voltage remains the voltage warning
will occur and the voltage present displayed.
6. Remove the test leads only when no voltage is indicated.
Locking Test Button (ltb)
When it is desired to do a long insulation test, the test can be
‘locked on’ by pressing the
key while the test button is
held down. The warning
will appear on the display and
both buttons may be released whilst the test continues. The
next press of the test button will terminate the test.
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