4-18 Chapter 4
Start Troubleshooting Here
Receiver (8753ES)
Figure 4-8 Typical Measurement Trace
If the source is working, but the A or B input traces appear to be in error, refer to
Chapter 8 , “Receiver Troubleshooting.”
The following symptoms may also indicate receiver failure.
Receiver Error Messages
• CAUTION: OVERLOAD ON INPUT A; POWER REDUCED
• CAUTION: OVERLOAD ON INPUT B; POWER REDUCED
• CAUTION: OVERLOAD ON INPUT R; POWER REDUCED
The error messages above indicate that you have exceeded approximately +14 dBm at one
of the test ports. The RF output power is automatically reduced to −85 dBm. The
annotation P↓ appears in the left margin of the display to indicate that the power trip
function has been activated. When this occurs, press and enter a lower power
level. Press to switch on the power again.
Faulty Data
Any trace data that appears to be below the noise floor of the analyzer (−100 dBm) is
indicative of a receiver failure.
Power
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