Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 237
Micro-Deck Assembly
A7 Micro-Deck Assembly Troubleshooting
23.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.
24.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.
25.At this point the power level on the spectrum analyzer display should
equal the power level on the source, +/-1 dB.
As was mentioned at the start of this procedure, it is assumed that the
automatic leveling control system is operating properly when using internal
leveling. So, if there is a problem with external leveling, whether it is when
using the modulator on the A7 Micro-Deck or the A3 RF assembly, the problem
is most likely with the A7A1 Microwave ALC assembly on the A7 Micro-Deck.
Replace the A7 Micro-Deck assembly.
Z AXIS OUT
This procedure will verify that the Z AXIS OUT output is functioning properly. It
will require the use of an oscilloscope.
1. Return the instrument to a known state by pressing Preset.
2. Connect the source rear panel Z AXIS OUT connector to channel 1 of an
oscilloscope.
3. Setup the oscilloscope with the following settings:
— Channel 1 volts per division = 1 V
— Horizontal Scale per division = 1 ms
4. Set the sweep start frequency to 1 GHz by pressing SWEEP, Configure
Step Sweep, Freq Start, 1 GHz.
5. Set the sweep start frequency to 2 GHz by pressing Freq Start, 2 GHz.
6. Set the number of sweep points to 3 by pressing # Points, 3, Enter.
7. Set the dwell time to 100 µs by pressing More, Step Dwell, 100 µs.
8. Set the sweep to single by pressing SWEEP, Sweep Repeat Single.
9. Turn the step sweep on by pressing SWEEP, Sweep, Freq On.
10.Trigger the sweep by pressing SWEEP, Single Sweep.
11.The signal on the oscilloscope display should now be a pulsed signal
similar to that shown in Figure 11-2.
If option UNZ, Fast Switching, is installed the oscilloscope horizontal
scale should be set to 200 μs per division.
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