13
of AC system voltage.
8.4 Select either Trac mode or Lok mode as required and press
the test button. The value of insulation resistance in megohms
will be displayed. The bar graph will display the insulation test
voltage. If in Lok mode the bar graph will rise and then decay
to zero with the insulation resistance reading remaining on the
LCD for as long as the test button is depressed. The insulation
test voltage is only applied for as long as indicated by the bar
graph.
Caution: Never turn the function dial whilst the button is
depressed. This may damage the instrument. Never
touch the circuit under test during insulation testing.
When testing is complete ensure that the test button is
released before the test leads are disconnected. This is because
the system may be charged up and it must be allowed to dis-
charge through the tester's internal discharge resistor. The
KT35 will show this discharge as a decaying bar graph.
9
Continuity Testing (Resistance Tests)
Warning: Ensure circuits are not live before commencing
testing.
9.1 Select the continuity test by rotating the function dial.
9.2 Select the 20
Ω
range by rotating the range selector and
connect the test leads to the instrument. Short the tips of the
leads. Press and hold down the test button by twisting it a
quarter turn clockwise. The display will show the resistance of
the test leads.
The KT35 has an auto null function which enables the tester to
automatically subtract this resistance before displaying the sys-
tem continuity resistance. To enable this function, turn the func-
tion dial to the Auto null position whilst still pressing the test
button and shorting the leads. Wait for the display to stabilise
