136 Chapter 6
Troubleshooting the IF Section
Verifying the A8 Analog IF Assembly Signal Path
Verifying the A8 Analog IF Assembly Signal
Path
This procedure assumes the A10 3rd Converter assembly is functioning
correctly. To verify proper 3rd Converter functionality, refer to the
“Verifying the A10 Third Converter Board E4440A, E4443A, E4445A,
E4446A, E4448A)” on page 129.
Analog IF Assembly Quick Check
1. Inject a −25 dBm, 50 MHz signal into the RF input of the
instrument.
2. Press
Preset on the instrument and tune to 50 MHz by pressing
Input, Input Port, RF, Frequency 50 MHz.
3. Press
Amplitude and set the input attenuation to 0 dB.
4. Disconnect the flexible gray cable (W10) going into the A7 digital IF
assembly at A7P1. Refer to Figure 10-21 on page 282 for cable
locations.
5. Connect a calibrated spectrum analyzer to the end of this flexible
cable, and measure the 7.5 MHz output from the analog IF assembly
going to the digital IF assembly.
6. If the analog IF assembly is operating properly, the 7.5 MHz 4th IF
out of the Analog IF assembly will measure −23 dBm ±1 dB, on the
calibrated spectrum analyzer.
7. Reconnect the cable to A7P1.
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