Hioki IR4051 - Lock Function

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2.5 Insulation Resistance Measurement
2.5.1 Lock Function
In order to prevent the inadvertent application of 500 V or 1000
V to a low-voltage device, the instrument provides a lock
function. This function will prevent the test voltage from being
output even if the MEASURE key is pressed while the rotary
selector is set to the 500 V, 1000 V, or PV
Ω range.
Releasing the lock
1.
Setting the rotary selector to the 500 V, 1000 V, or PVΩ
range will cause (IR4052) or
(IR4051, IR4053) to light up, and will flash.
On
Flashing
HIOKI IR4051A981-09