HP 8924E, Assembly

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Chapter 14, Diagnostics Descriptions
Description of RF Diagnostics (RFDIAGS3)
N:\mkt\MANUALS\HP8924C\ALR\diagnos.fb
Input A5
Refer to
figure 70, "Input Tests: Duplex Detector, RF Detector, and Step
Attenuator," on page 590
and
figure 71, "Input Tests: Ant, O/P Filter & Atten,
Autorange Atten, Counter, Temp Sensor," on page 591
for signal flow and
measurement points for the various measurement described in
table 126
.
Table 126 A5 Input Tests
Measurement Explanation and Suggestions Measurement Point
Duplex Detector
(No Signal) See Path 1, Node 1 in figure 70 on page 590 . The
signal from the signal generator synthesizer is set
to 750 MHz at >+10 dBm. The step attenuator is
set to zero attenuation. The duplex switch is set so
this internal signal does NOT go to the detector
on the duplex input so the detector should read
close to zero. If this test fails, it could be that a
signal is being applied to the front-panel BNC
connector. A cable hanging from the DUPLEX
IN connector can cause a failure.
DVM:DUPLEX_DET
Duplex Detector
(Signal Present) See Path 2, Node 1 in figure 70 on page 590 .The
duplex switch is changed so the internal signal is
applied to the duplex detector. The detector
should read the signal level.
DVM:DUPLEX_DET
RF Detector
(Low Power),
No Signal See Path 2, Node 2 in figure 70 on page 590 . The
low power RF detector is checked with no signal
present. The duplex switch from the previous test
is not letting the signal reach the RF detector.
DVM:RF_PK_DET_LOW
RF Detector
(Low Power),
Signal Present See Path 1, Node 2 in figure 70 on page 590 . The
duplex switch is changed to route the signal to the
RF detector.
DVM:RF_PK_DET_LOW
RF Detector
(High Power),
No Signal See Path 2, Node 3 in figure 70 on page 590 . The
high power RF detector is checked with no signal
present. The duplex switch is set so it does not let
the signal reach the RF detector.
DVM:RF_PK_DET_HIGH
RF Detector
(High Power),
Signal Present See Path 1, Node 3 in figure 70 on page 590 . The
duplex switch is changed to route the signal to the
RF detector.
DVM:RF_PK_DET_HIGH