5.1 Visual inspection
Before starting a measurement, the user should undertake visual
checks on the mains cord, case and that the correct type and rated fuse
is fitted to the appliance under test. There should also be no evidence
of damage of a nature that may impair the electrical safety of the
appliance.
5.2 Battery Voltage Check
If the batteries fall below the normal operating voltage, the
" "
icon turns on. If the Low battery icon is indicated (Fig.7), replace the
batteries according to 7. for Battery and Fuse Replacement.
5.3 Null setting
The IEE Code of Practice pass level for Protective conductor resistance
is 0.1Ω, which is a low value. So even the resistance of Test Leads will
affect the measurement result.
The KT72 can cancel the resistance of the test lead by pressing t
he
NULL
|
250V/500V
switch. The procedure of Null setting is shown
below.
The Null function is held in memory even when the instrument is turned
off, so theres no need to Null the lead resistance every time.
However, when replacing fuses or test leads, it is recommended to do a
Null setting again.
Note
● Null setting is possible at both Class l Test and Extension Lead
Test. However, only one Null value can be
held in memory. For
example, when the Null setting is carried out at Class l Test, the set
value will also be used for Extension Lead Test (unless it is reset).
● After the function switch is turned to the OFF position, the set Null
value is still held in the internal memory.
5. Preparation
before a
measurement
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