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The word ‘NULL’ will now appear in the display and all subsequent continuity tests conducted
by pressing the Orange test button will automatically deduct this value before displaying the
result. To conrm that this is working press the Orange test button with the prod tips still
connected together and the display should show zero resistance.
You can now use the Orange test button to measure the resistance of a circuit in either
manual or Hands Free mode and the result shown will be that of the circuit tested and not
include the resistance of the test leads.
This will continue as long as the ‘NULL’ indicator appears lit in the LCD, which will be
until the tester is switched off either manually or as a result of the Auto off feature. If the
instrument is powered off by either method it will be necessary to null the leads again before
further testing.
Hands Free continuity testing
To enable the hands free feature simply press the HANDS FREE button once, The
‘HANDSFREE’ annunciator will appear ashing on the LCD and will continue to do so until
canceled by a further press of the HANDS FREE button or by changing the function selector
switch.
When the HANDSFREE annunciator is ashing a single press of the Orange test button will
toggle continuous testing on and off.
Once started a steady beeping tone will be emitted to indicate that measurement is being
taken.
After a second or two the test result will be displayed in the primary display area and an
audible tone will indicate either by a single beep that the result is a value under 20 K
Ω or by
a short 2-tone alarm that the result is a value over 19.99 K
Ω. The secondary display area
will show the terminal voltage being applied.
The tester will continue to take measurement and any further change to the resistance of
the circuit will be indicated by an audible tone as described above and a change of result on
the display.
A further single press of the test button will suspend measurement.
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