KYORITSU 6017 - Manual (Page 18)

16
6-2 Insulation Resistance Measurement
The insulation resistance function is used for insulation check on electric
appliances, wiring systems, etc.
The circuit under test must be disconnected from mains and de-energized before
attempting to make measurement. Check the maximum voltage that may be
applied to the circuit under test.
Note:
¡
In some cases, insulation resistance values are not stable, causing the reading
to vary during measurement.
¡ The instrument may generate a high pitch tone during measurement, but this is
not a failure.
¡ If the circuit under test has a large capacitive load, it may take some time before
the reading becomes stable for the final value.
¡ On insulation resistance ranges, DC voltage is supplied through the earth lead
and the line probe lead, with the earth lead having positive polarity.
The earth lead should be connected to the earth conductor in the circuit under
test. Such connection is known to be more suitable for insulation testing since
insulation resistance values measured with the positive side connected to earth
are typically less than those taken through the reversed connection.
DANGER
¡ When the test button or the remote control switch is pressed with the
function selector switch set to an insulation resistance range, never touch
the tips of the probes or the circuit under test, where a high voltage is
present in order to avoid possible shock hazard.
CAUTION
¡ Do not perform insulation tests on an energized circuit to avoid possible
damage to the instrument or the circuit under test.
1. Check that the circuit under test is de-energized.