Amprobe Multitest-1000 Continuity-Tester - Manual (Page 19)

4.2. M Ω: INSULATION RESISTANCE MEASUREMENT WITH TEST VOLTAGE
OF 50V, 100V, 250V, 500V OR 1000V
Refer to EN 61557-2 and VDE 0413 part 1.
WARNING
Before performing the insulation test make sure that the circuit under test is
not energized and all the relative loads are disconnected.
Turn the rotary knob to the M Ω position.
Switch on the instrument.
The FUNC key permits the operator to select one of the following measuring
modes (which can be shown cyclically by pressing the FUNC key):
FUNC
) MAN mode (minimum test time of 4 seconds or the key press duration of
the START/STOP key). Recommended test.
) TIMER mode (test duration is set to the selected interval (from 10 to 999
seconds). This test can be performed in case a minimum measuring time
is required.