NF HVA4321, Instruction Manual

Page: 130 / 152

6.1 When suspecting a fault
HVA4321
6-2
When SIGNAL is OFF
Problem Cause Action
The output warning lamp of this
unit may light depending on the
load conditions or response
settings.
Change the response settings.
Check the output monitor with an
oscilloscope and check if there is
any oscillation.
In constant current mode, the
output warning lamp may light
when the voltage limit is set to a
large difference between positive
and negative values. Set the positive and negative voltage
limit values to the same level as
much as possible.
The output warning lamp lights
despite SIGNAL OFF.
Is the output open in constant
current mode? Be sure to connect the load.
When SIGNAL is ON
Problem Cause Action
Unexpected high voltage
output is given in constant
current mode. Is the load correctly connected? Make sure that the connection to the
load is correct.
Is the load connected to the
TOTAL terminal? Connect the load to the LOAD
terminal correctly. Unexpected high voltage
output is given in constant
current mode or LOAD mode. Is the load grounded?
Do not ground the load.
When the output is
short-circuited in constant
c constant voltage
mode, over-current occurs. DC bias operates at constant
voltage in constant c
constant voltage mode. Do not short-circuit the output in
constant c constant voltage
mode.
When the current limiter is
activated for capacity load,
peak current increases. When voltage becomes non-linear
due to activation of the current
protection circuit, peak current
may increase. Increase the current limit setting.
When capacity load is
connected in constant current
mode, ham occurs. In the low frequency range, the
capacity load is a large
impedance. If it is a problem, use the unit in load
mode. The ham may be decreased.
If any of the check items above is not applicable or corrective actions described do not improve status,
take measures to prevent supply of the power by attaching a paper to this unit indicating "Not for use".
Then, contact us or your sales agent you purchases.