Keysight Technologies X Series Service Manual page 236

Micro-Deck Assembly
A7 Micro-Deck Assembly Troubleshooting
9. Turn the output power on by pressing RF On/Off so that the LED below it
10.The power level of the signal on the spectrum analyzer display should be
11.Set the external leveling amplitude offset to match the coupling factor of
12.Switch the instrument to external leveling by pressing Leveling Mode, Ext
13.The signal level on the spectrum analyzer display as well as the indicated
14.Place a measurement marker on the 10 GHz signal on the spectrum
15.Adjust the Ext Leveling Amptd Offset on the source until the power level
16.Once the power level displayed on the source equals the spectrum
17.At this point the power level on the spectrum analyzer display should
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
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
236
— Span = 10 MHz
— Reference level = +10 dBm
comes on.
approximately 0 dBm, minus any loss through the coupler, connectors,
and cable.
the directional coupler by pressing AMPTD, Leveling Control, Ext Leveling
Amptd Offset <coupling factor> (If unknown enter 16 dB).
Detector.
power level on the source may change by a few dB, but the Unlevel
indicator should not be displayed on the source display.
analyzer and note the level.
displayed on the source equals the spectrum analyzer marker level,
+/-1 dB.
analyzer marker level, set the power level on the source to 0 dBm by
pressing AMPTD, 0 dBm.
equal the power level on the source, +/-1 dB.
of the directional coupler by pressing AMPTD, Leveling Control, Ext
Leveling Amptd Offset <coupling factor> (If unknown enter 16 dB)
approximately 0 dBm, minus any loss through the coupler, connectors,
and cable.
Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide