GW Instek APS-1102A, User Manual, Page: 255 / 285

7 TROUBLESHOOTING
APS-1102A 7-13
Table7-11. When Failure Is Suspected (Problem Related to Output Voltage or Output
Voltage Range Setting)
Symptom Possible Cause Required Action, etc.
Cannot set output
voltage. External signal input mode has
been set.
Output voltage cannot be set when the signal
source mode is external signal input (EXT).
Set the signal source mode to internal (INT) or
in external (ADD) mode.
See “3.4.2 Setting output mode”
.
See “5.3.1 Output mode setting”
.
Set value differs from
measured value.
Unnecessary items have been
set (for example, AC has been
set even though only DC output
will be used). Check the settings again.
When using ADD mode, check both the external
signal and external input gain.
See
“4.10 Adding External Signals
and Internal Signals
”
.
Also, check the selected measurement display
items.
See “5.5.6 Selection of
measurement display (MEASURE)
”
.
A low impedance load is being
driven. With a low resistance load, inductance load, or
capacitive load, the measured value may be less
than the value set for the limiter operation.
Table7-12. When Failure Is Suspected (Problem Related to Frequency Setting)
Symptom Possible Cause Required Action, etc.
Output frequency
cannot be set.
External signal input or external
synchronization mode has been
set.
Output frequency cannot be set when the signal
source mode is external signal input (EXT) or
external synchronization (SYNC).
Set the signal source mode to internal (INT) or
in external (ADD) mode.
See “3.4.2 Setting output mode”
.
See “5.3.1 Output mode setting”
.
Line synchronization
cannot be set. External synchronization mode
has been set.
Set the signal source mode to external
synchronization (SYNC), then set the external
sync signal source to LINE.
See “3.4.2 Setting output mode”
.
See “4.7.2 Line synchronization”
.
See “5.3.1 Output mode setting”
.