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APPENDIX 4. TROUBLESHOOTING – COMMON OPERATIONAL ERRORS
Problem
Can't Enable
High-voltage
Can't
communicate
with
computer
Noisy
Channels
No voltage
applied
Incorrect
voltage
applied
Out of range
voltage error
48
Possible Cause
Interlock is not
connected.
LED above ALL on front
panel will glow Red
when interlock is not
satisfied.
Wrong HVS model
selected
HVS not connected to
computer
RS232 cable not
connected
Wrong COM port
selected
Operating at low
voltages (<200 V)
High-voltage is disabled
Active voltage control is
not selected
Voltage set outside
range
Solution
Connect interlock (50 Ohm terminator) to
back panel.
Twist interlock to get a good connection.
LED above ALL will glow Green when an
electrical connection is achieved.
View>Options>HVS448 Model> select
correct model.
See can't communicate with computer
(below).
Verify RS232 cable securely connected to
HVS448 and computer.
If using a RS232 to USB adapter ensure the
adapter driver software is loaded on
computer.
Go to View>Options>Communication... and
select correct COM port.
The HVS is designed for optimal
performance at high voltages.
Use a higher common-mode voltage to
achieve the desired potential difference (i.e.,
apply 1000 V to A and 900 V to B for 100 V
differential)
If you must operate at low voltage reference
to the case ground, the output can be
stabilized by loading the channel with an
external resistor, either to ground or
preferable to a voltage applied by another
channel so that several 10s of microamps
flow from the channel. Make sure the
resistor can take the applied power and that
the resistor does not overload the channel.
Toggle Enable High Voltage button on
toolbar.
Go to View>Options. Ensure Active Voltage
Control is checked.
In the Manual High-Voltage Power Supply
Controls window, ensure set voltages for
each channel are consistent with "Output
voltage range" selection.
Manual Page
pp.8, 14
pp.8,
9
pp.8
p.9
p.7
p.8
p.42
p.20
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