Hioki ST5540, Instruction Manual, Page: 46 / 326

3.4 Turning Power On and OFF
40
Turning Power Off
Always turn off the power switch of equipment under test before turning off
power of the instrument to avoid damaging the equipment under test. The instru-
ment uses an internal relay for switching the power line to equipment under test
and turning off the power switch of the instrument opens all lines and turns off
the equipment under test.
NO
：
Normally open
Condition of power line for equipment under test with the main
instrument power switch turned OFF (schematic diagram)
1.
Turn off the power switch of equipment under test connected to the terminal block.
2.
Turn off the circuit breaker.
3.
Turn off the power switch (OFF: ) on the front panel.
When the power switch is turned off, the measurement conditions are saved. In case of power
supply failure (e.g., power outage), the instrument restores the conditions held immediately
before power failure occurred.
2
3