Keysight Technologies X Series Service Manual page 164

RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
To further test the YTF control current, select Amps on the DVM and place the
positive lead of the DVM on one of the YTF Coil Current P8 pins and the other
DVM lead to the other Coil Current pin.
In order to measure the control current correctly, press Single on the analyzer in between each
measurement.
If any of the preselector control currents do not match the levels shown in
Table
Control Assembly. Perform the YTF characterization (press System,
Alignments, More, Ad vanced, Characterize Preselector) and re-check the
control current at various center frequencies.
Tolerances should be used as a guideline. The true test is whether or not the analyzer will
function and meet published specification.
164
4-8, the most probable causes are a misaligned YTF or the A15 Front End
Table 4-8
Center Frequency
(GHz)
5.0
a
10
b
15
b
20
b
26
a. Options 513 and 526
b. Option 526
YTF Tune Current
Control Current
(mA)
106
215
324
430
560
Keysight N9010A EXA Service Guide
Tolerance
(mA)
±20
±25
±30
±40
±50