6A. 8590L, 8591C, And 8591E - Agilent Technologies 8590 Series Service Manual

Troubleshooting the RF Section

6a. 8590L, 8591C, and 8591E

6a. 8590L, 8591C, and 8591E
This section describes the RF section troubleshooting process for the 8590L
and 8591E spectrum analyzers and 8591C cable TV analyzers.
Making RF Power-Level Measurements
The power level ranges listed for measurements A through G in
Table 6-1 apply after performing the following steps:
1. Connect the CAL OUT to the RF INPUT using the CAL cable.
2. Perform the frequency and amplitude calibration routines.
3. Press
4. Press the following instrument keys:
Table 6-1 Power Levels at Measurement Points
Measurement Point
A
B
C
D
E
F
G
* A frequency-selective measuring device, such as another analyzer, is recommended for making these
measurements. Broadband measuring devices, such as power meters, give erroneous results due to the presence
of other, higher-amplitude signals.
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Ensure that the CAL OUT amplitude is within specification. (Refer to
the calibrator amplitude performance test in the calibration guide.)
, then wait for the analyzer to complete the preset routine.
PRESET
, 300,
FREQUENCY MHz
, 0,
SPAN Hz
Measurement
Frequency
300 MHz
2.1214 GHz
2.1214 GHz
321.4 MHz
2.4214 GHz
2.4214 GHz
1.8 GHz
Power Level Range *
(dBm)
50 Ω
−29 to −31
−39 to −43
−39 to −44
−42 to −46
+6 to +12
−10 to −20
−17 to −23
75 Ω
−35 to −37
−46 to −49
−46 to −50
−51 to −55
Same as 50 Ω
Same as 50 Ω
Same as 50 Ω
Chapter 6