250 Keysight N9010A EXA Service Guide
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Preselector Tune Output
The Presel Tune connector A15J300 (FEC) or A15J302 (EFEC, EFEC-Lite,
S-EFEC) is a test point used to verify the internal A12, YIG Tuned Filter drive
voltage variations with center frequency. The YTF is used in the high band path
(3.6 GHz to the analyzer’s maximum frequency). Connect Presel Tune to a
voltmeter. Use the MMCX (m) to SMB (f) to connect to Presel Tune on the A15
board and appropriate adapters to connect to the voltmeter. Refer to Figure
6-1 or Figure 6-2 or Presel Tune location. You may also need a Banana plug to
BNC (f) adapter, part number E9637A for the Voltmeter. The preselector tune
output voltage can be measured to verify this portion of the A15 is functioning.
Press System, Alignments, Auto Align, Off on the analyzer once it has fully
booted to the spectrum analyzer application. Press Span, Zero Span on the
analyzer. The preselector tune output voltage in high band should change
when the center frequency of the analyzer is changed.
Preselector tune output measurements are not valid for Option 503, 3 GHz frequency range.
Table 6-11 Preselector Tune Output Voltages
Center Frequency
(GHz)
~ Tune Voltage
(VDC)
Valid Frequency
Range Option
5.0 1.6 507, 513, 526
10.0 3.3 513, 526
15.0 4.85 526
20.0 6.5 526
26.0 8.45 526
Table 6-12 Preselector Tune Output Voltages (Option 532, 550)
Center Frequency
(GHz)
~ Tune Voltage
(VDC)
Valid Frequency
Range Option
5.0 0.9 532, 544
10.0 1.8 532, 544
15.0 2.7 532, 544
20.0 3.6 532, 544
25.0 4.6 532, 544
30.0 5.5 532, 544
40.0 7.3 544
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