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244 Chapter 12
Troubleshooting
RF Output Power Problems
RF Output Power too Low
1. Look for an OFFS or REF indicator in the AMPLITUDE area of the display.
OFFS tells you that an amplitude offset has been set. An amplitude offset changes the value shown
in the AMPLITUDE area of the display but does not affect the output power. The amplitude
displayed is equal to the current power output by the signal generator hardware plus the value
for the offset.
To eliminate the offset, press the following keys:
Amplitude > More (1 of 2) > Ampl Offset > 0 > dB.
REF tells you that the amplitude reference mode is activated. When this mode is on, the displayed
amplitude value is not the output power level. It is the current power output by the signal
generator hardware minus the reference value set by the
AmplRefSet softkey.
To exit the reference mode, follow these steps:
a. Press
Amplitude > More (1 of 2).
b. Press
Ampl Ref Off On until Off is highlighted.
You can then reset the output power to the desired level.
2. If you are using the signal generator with an external mixer, see “Signal Loss While Working with
a Mixer” on page 244.
3. If you are using the signal generator with a spectrum analyzer, see “Signal Loss While Working
with a Spectrum Analyzer” on page 246.
The Power Supply has Shut Down
If the power supply is not working, it requires repair or replacement. There is no user-replaceable
power supply fuse. Refer to the E8257D/67D PSG Signal Generators Service Guide for instructions.
Signal Loss While Working with a Mixer
If you experience signal loss at the signal generator’s RF output during low-amplitude coupled
operation with a mixer, you can solve the problem by adding attenuation and increasing the RF
output amplitude of the signal generator.
Figure 12-1 shows a hypothetical configuration in which the signal generator provides a low
amplitude signal to a mixer.