Agilent Technologies n5181a, Service Manual, Page: 51 / 202

Agilent N5161A/62A/81A/82A/83A MXG Signal Generators Service Guide
Troubleshooting
No Output Power or Output Power is Unleveled (N5183A)
1-43
4. Set up the spectrum analyzer:
a. Press
Preset
.
b. Set the reference level to +25 dBm (or maximum available power).
c. Set the start frequency to 50 kHz.
d. Set the stop frequency to 3.2 GHz.
e. Set Trace to Max Hold.
5. Set up the signal generator:
a. Press
Preset
.
b. Press
SWEEP
>
Sweep Type List Step
to Step.
c. Press
Configure Step Sweep
.
• Press
Freq Start
>
100
>
kHz
.
• Press
Freq Stop
>
3.1999
>
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
>
ALC Off On
to Off.
f. Press
AMPTD
> <maximum settable power> >
dBm
.
6. Let the signal generator sweep until the spectrum analyzer displays a sufficient number of points to provide a good representation of the
power performance across the range of frequencies in the sweep.
7. Using the marker feature on the spectrum analyzer, measure the lowest power level displayed for sweep points between 100 kHz and
3.1999 GHz, and record the lowest power reading.
• If the measured power is < 23 dBm:
a. Replace the A3 RF assembly.
b. Go to Chapter 4, "Post-Repair Procedures and Performance Verification" .
• If the measured power is
≥
23 dBm and Option 1EM (RF output on the rear panel) is installed:
a. Replace the A7 Micro Deck.
b. Go to Chapter 4, "Post-Repair Procedures and Performance Verification" .
• If the measured power is
≥
23 dBm and the signal generator has the standard RF output (front panel output), continue to “Checking
Attenuator Output Signals < 3.2 GHz (N5183A)” on page 1-44 .
深圳德标仪器
135-1095-0799