Agilent Technologies 85032B/E 50 Spezifikationen Seite 173

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8712ET/ES and 8714ET/ES Troubleshooting and Block Diagrams
RF Network Analyzers Category 2 Failures: No Error Messages but One or More Measurements Are Nonfunctional
Service Guide 4-31
2. If one of the fractional-N outputs is not correct, press .
Make sure the dither function is off, since the frequencies will be different for dither on.
If the problem persists, replace the A3 fractional-N/reference assembly (refer to
“Removing the Fractional-N/Reference Assembly” on page 3-10).
Troubleshooting the Source Assembly (A4)
NOTE The following measurement values assume a properly adjusted instrument. If
no correction constants have been loaded, the power levels given may vary a
few dB either way.
Checking the RF Output
Perform the following steps to check the RF output of the source assembly.
1. Measure the RF output signal directly out of the source board at A4J4. Press
and set the output frequency to CW mode to 50 MHz by pressing
. The RF output should be at 50 MHz ±250 Hz. The exact
power level of this will vary depending upon the installed options, but should typically
be in the +1 to +9 dBm range.
2. Set the frequency to 3000 MHz (1300 MHz for 8712ET/ES) and measure the power
again. This power level should be in the range of +2 to +10 dBm, again depending upon
the installed options. Frequency accuracy should be 3000 MHz ±15 kHz
or (1300 MHz ±6.500 kHz for HP 8712ET/ES).
1.3 GHz 56.875 MHz 1.3 GHz 49.762587 MHz
2.0 GHz 43.336806 MHz
3.0 GHz 57.008681 MHz
8712ET/ES 8714ET/ES
Source
Frequency
Fractional-N
Frequency
Source
Frequency
Fractional-N
Frequency
MENU
Spur Avoid Options
PRESET
POWER 0
dBm
FREQ
CW
50
MHz
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