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PSI System Controls and Diagnostics
F3200E User Manual
F3200E_UM_180726 Page 97 of 107
25
Fault-finding
Symptom
Possible Cause
Confirmation
Solution
High noise levels
Insufficient averaging for the
signal being measured
Noise level reduces with
averaging period
Use an appropriate amount of
averaging time for the signal
level.
RF pickup
Noise varies with cable
position, status of neighboring
equipment.
Check integrity of outer
screens of signal cables.
Line voltage pickup
Noise level drops sharply if
averaging period is 16.7 msec
(60 Hz) or 20 msec (50 Hz)
Keep F3200E and signal
cables clear of unscreened
high current mains voltage.
Use averaging periods (N/line
frequency).
No signal
Small signal lost in noise
Signal appears on more
sensitive current range or with
more averaging.
Use appropriate current range
and averaging.
Unit is waiting for external
trigger.
Check trigger mode.
Use appropriate trigger mode.
Very few samples measured
Unit is in unbuffered mode
with a low stop count
Check settings
Use buffered mode or remove
stop conditions.
No data seen on PTC
DiagnsoticG2 scope display
Number of samples per burst
less than the number needed to
refresh the display.
Look at strip chart display
Define a burst size that forces
scope mode refresh.