Verifying The 250 Mhz If Input Power (Option B40 Only) - Keysight N9040B Option 508 Service Manual

Analog/Digital IF Troubleshooting
A3 Digital IF Troubleshooting

Verifying the 250 MHz IF Input Power (Option B40 only)

Perform this procedure only if the analyzer is equipped with Option B40, Analysis Bandwidth,
40 MHz
1. Perform an instrument shutdown.
2. Remove the cover of the UXA Signal Analyzer. Refer to
3. Turn the instrument over so that the bottom side of the analyzer is facing
4. Turn on the UXA Signal Analyzer and wait for the instrument to complete
5. Press Mode, IQ Analyzer (Basic), Mode Setup, IF Path, 40 MHz.
6. Press System, Alignments, Auto Align, Off.
7. Press Input/Output, RF calibrator, 50 MHz.
8. Verify the 50 MHz signal is at −25 dBm by pressing FREQ, 50 MHz, SPAN,
9. To continue verifying press Meas, IQ Waveform. Verify the input
10.Referring to
Keysight Technologies N9040B UXA Signal Analyzer Service Guide
"Assembly Replacement Procedures", on page 347
up.
the boot up process.
1 MHz, Peak Search on the analyzer. The maker readout should be 50 MHz
at −25 dBm ± 3 dB. If this reference signal is measuring incorrectly, see
Chapter 4, "RF Section Troubleshooting (RF/Microwave Analyzers)", on
page 139 in this service guide.
attenuator on the UXA is set to 10 dB. Look near the top of the display
near the center and verify Atten: 10 dB is visible. If needed change the
input attenuator by pressing AMPTD, Attenuation, 10 dB on the analyzer
Figure 6-11, carefully disconnect W26 from A3J15.
Chapter 15,
in this service guide.
203