Hioki ST5520, Instruction Manual, Page: 38 / 201

30
Pre-Operation Inspection
Checking HIGH terminal contact
To ensure safety, perform the following check with the HIGH side test leads removed.
It is recommended to set test conditions as follows.
(Example) When the insulation resistance of the equipment to be measured is 100 M
Ω
Test voltage
25 V
Lower limit value 1 M
Ω
Test duration 10 s
(As there is a step to start a tes in the check procedure, set the test voltage low.)
1
Turn off the instrument power.
2
Connect the test leads to the LOW
terminals. (Do not connect the test leads to
the HIGH terminals.)
LOW
Black
HIGH
For contact
check
3
Turn on the instrument power.
4
Set the contact check function to [ON] .
(p. 56)
5
Allow the test leads to short circuit.
6
Start a test.
7
Check that a contact error occurs.
(If the test still starts even under these conditions,
the contact check function may not be
[ON] or the
instrument may be damaged.)