350 Keysight N9038A MXE Service Guide
Analog & Digital IF
A3 Digital I.F. Troubleshooting
Noise Source Output (Optional N9069A software required)
1. Connect an oscilloscope with a 1 M Ω input impedance to the Noise
Source connector on the rear panel of the instrument as illustrated in
Figure 10-13.
2. Tune the oscilloscope to measure 5 Volts per division vertically and 5 ms
per division horizontally.
3. Switch the instrument into the Noise Figure measurement personality by
pressing Mode, Noise Figure.
4. Since the Noise Source output will only work when there is nothing
connected to the Smart Noise Source output, disconnect anything that
might be connected to it, as illustrated in Figure 10-13.
5. Reset the Noise Figure mode to its default settings by pressing Mode
Setup, Restore Mode Defaults.
6. Verify that the there is a signal on the oscilloscope screen who's voltage
and pulse width resembles that shown in Figure 10-18. (The pulse width
will vary as the instrument sweeps)
This output will only operate when the optional N9069A Noise Figure measurement personality
is installed in the instrument.
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