Technical data

Chapter 8 8-5
Receiver Troubleshooting
Check the R, A, and B Inputs
Check the R, A, and B Inputs
Good inputs produce traces similar to Figure 8-2 in terms of flatness. To examine each
input trace, do the following:
1. Connect the equipment as shown in Figure 8-1. (The through cable part number is
8120-4781.)
Figure 8-1 Equipment Setup
2. Check the flatness of the input R trace by comparing it with the trace in Figure 8-2.
NOTE The R trace will be 20 dB lower than the A and B trace due to the attenuator
on the R input. the flatness of the trace, however, should resemble that of the
A and B input traces.
Press .
3. Check the flatness of the input A trace by comparing it with the trace in Figure 8-2.
Press .
4. Check the flatness of the input B trace by comparing it with the trace in Figure 8-2.
Move the A input cable to the B input and press .
• If none of the input traces resembles Figure 8-2, continue with “Troubleshooting
When All Inputs Look Bad” on page 8-7.
Preset Meas
R
Scale Ref
AUTO SCALE
Meas
A
B