Hioki ST5520-01 - Troubleshooting Common Issues

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Discharge and
remaining voltage
warning
Any charge remaining in equipment to be measured is automatically
discharged inside of the instrument when the testing is completed.
The TEST lamp blinks during discharge and turns off when the voltage
between the measurement terminals falls under 10 V ± 3 V.
During a test: Blinking interval 250 ms
During discharge: Blinking interval 500 ms
Judgment beep sound
Setting PASS (beeps when a PASS judgment is made), FAIL (beeps when a
FAIL judgment is made), END (beeps at the end of a test), or OFF (no
beep sound) can be selected.
Key beep sound ON/OFF can be switched.
System reset The system is initialized.
Short circuit check Before a test, apply approx. 2 V to 4 V to equipment to be measured
and check for short circuits.
No short circuit: A test starts.
Short circuit: No tests start. A short circuit error is output.
Short circuit check
time automatic
measurement
function
This function can be performed only when the short circuit check
setting is ON.
• AUTO setting
A test starts after the automatic short circuit check has been
completed.
The time required for the short circuit check is displayed on the
screen.
When it takes 0.5 s or more, the short circuit check will time out.
• MANUAL setting
The time to be taken for the short circuit check can be set freely.
Setting range: 0.010 s to 1.000 s
Communications
monitor function
RS commands and query responses are displayed on the screen.
External interface
The EXT.I/O mode can be switched between NPN (current sink output) and PNP
(current source output).
The switching is set by using the switch on the back of the instrument.
(1) Input signal
• Common specications
Photocoupler-isolated, no voltage contact input (current sink output and current source output
are supported)
Input ON Residual voltage 1 V or less (input ON current 4 mA (reference value))
Input OFF OPEN (cutoff current 100 µA or less)
Response time Edge 1.0 ms
MAX
10
9
8
7
6
5
4
3
2
1
Appx. Ind.