236 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Micro-Deck Assembly
A7 Micro-Deck Assembly Troubleshooting
— Span = 10 MHz
— Reference level = +10 dBm
9. Turn the output power on by pressing RF On/Off so that the LED below it
comes on.
10.The power level of the signal on the spectrum analyzer display should be
approximately 0 dBm, minus any loss through the coupler, connectors,
and cable.
11.Set the external leveling amplitude offset to match the coupling factor of
the directional coupler by pressing AMPTD, Leveling Control, Ext Leveling
Amptd Offset <coupling factor> (If unknown enter 16 dB).
12.Switch the instrument to external leveling by pressing Leveling Mode, Ext
Detector.
13.The signal level on the spectrum analyzer display as well as the indicated
power level on the source may change by a few dB, but the Unlevel
indicator should not be displayed on the source display.
14.Place a measurement marker on the 10 GHz signal on the spectrum
analyzer and note the level.
15.Adjust the Ext Leveling Amptd Offset on the source until the power level
displayed on the source equals the spectrum analyzer marker level,
+/-1 dB.
16.Once the power level displayed on the source equals the spectrum
analyzer marker level, set the power level on the source to 0 dBm by
pressing AMPTD, 0 dBm.
17.At this point the power level on the spectrum analyzer display should
equal the power level on the source, +/-1 dB.
This procedure so far has tested the instrument’s ability to use an external
leveling detector along with the ALC modulator located on the A7 Micro-Deck
assembly. To test its ability to do the same when using the ALC modulators on
the A3 RF assembly continue with the steps below.
18.Tune the spectrum analyzer center frequency to 1 GHz.
19.Tune the source to 1 GHz by pressing FREQ, 1 GHz.
20.Reset the external leveling amplitude offset to match the coupling factor
of the directional coupler by pressing AMPTD, Leveling Control, Ext
Leveling Amptd Offset <coupling factor> (If unknown enter 16 dB)
21.Set the power level to 0 dBm by pressing AMPTD, 0dBm.
22.The power level of the signal on the spectrum analyzer display should be
approximately 0 dBm, minus any loss through the coupler, connectors,
and cable.
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