KYORITSU 3161A - Manual (Page 16)

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This function allows electric charges stored in the capacitance of
the circuit under test to be automatically discharged after testing.
Discharge can be monitored by the AC voltage reading.
(6) Set the Range switch to the OFF position, and disconnect the
probes from the instrument.
6-3 Continuous measurement
For continuous measurement, a lock-down feature is
incorporated on the Test button. Pressing and turning
clockwise locks the button in the operating position, the
button is released by turning it counterclockwise.
DANGER
While the Test button is locked down, a high voltage is present at
the tip of a probe. Attention should be paid to avoid possible
shock hazard.
6-4 Output voltage characteristics
The 500V range of this instrument conforms to IEC61557. This
standard defines that the nominal current shall be at least 1mA,
and the lower limit of the insulation resistance maintaining the
nominal voltage at the measurement terminal. (See the graph
below.) This value is calculated by dividing the nominal voltage by
nominal current. i.e., in case that the nominal voltage is 500V,
the lower limit of the insulation resistance is found as follows.
Divide 500V by 1mA equals 0.5MΩ
That is, insulation resistance of 0.5MΩ or more is required to
provide the nominal voltage to the instrument.
Note) The 15V range doesn't conform to this standard.