Keysight N5171B EXG Service Manual page 100

Troubleshooting
Troubleshooting No, Low, or Unleveled Output Power (N5173B/83B)
5. Set up the signal generator:
6. Let the signal generator sweep until the spectrum analyzer displays a
7. Using the marker feature on the spectrum analyzer, measure the lowest
Keysight X-Series Signal Generators Service Guide
a. Press Preset.
b. Press SWEEP > Sweep Type List Step to Step.
c. Press Configure Step Sweep.
— Press Freq Start > 2.8 > GHz.
— Press Freq Stop > 10.4 > GHz.
— Press # Points > 501 > Enter.
— Press More > Step Dwell > 2 > msec.
— Press Return > Return > Sweep > Freq Off On to On.
d. Press RF On/Off to On.
e. Press AMPTD > <maximum settable power> > dBm.
f. Press AMPTD > ALC Off On to Off.
sufficient number of points to provide a good representation of the power
performance across the range of frequencies in the sweep.
power level displayed for sweep points between 2.5 GHz and 5 GHz.
— If the measured power is < –5 dBm (for example, –6 dBm):
a. Replace the A3 RF assembly.
b. Go to Chapter 4, "Post-Repair Procedures and Operational
Performance
— If the measured power is ≥ –5 dBm (for example, –4 dBm), and the
signal generator has Option 1EM (RF output on rear panel):
a. Replace the A7 Micro Deck.
b. Go to Chapter 4, "Post-Repair Procedures and Operational
Performance
— If the measured power is ≥ –5 dBm (for example, –4 dBm), and the
signal generator has standard RF output (front output):
a. Turn off the signal generator and reinstall the W21 cable
between the A3 RF assembly output and the 20 GHz
doubler input.
b. Continue to
(N5173B/83B).
Verification.".
Verification.".
Checking Attenuator Output Signals ≥ 3.2 GHz
93