Chapter 2 79
Test Descriptions
Instrument Noise Figure
6. Set the stop frequency dependant on the NFA’s upper frequency
range.
For the N8972A set the stop frequency to 1.5 GHz (press
Stop, 1, ., 5,
GHz)
For the N8973A set the stop frequency to 3.0 GHz (press
Stop, 3, ., 0,
GHz).
For the N8974A set the stop frequency to 6.7 GHz (press
Stop, 6, ., 7,
GHz).
For the N8975A set the stop frequency to 26.5 GHz (press
Stop, 2, 6,.,
5, GHz).
7. Set the number of measured points to 401 (press the
Frequency/Points
key, then
More, Points, 4, 0, 1, Enter).
Step 6. Models N8974A and N8975A only: run the Yig Tuned Filter alignment
by pressing
System, Alignment and Align YTF then wait for the alignment
routine to complete.
Step 7. Restart the NFA sweep by pressing the
Restart key.
Step 8. Once the single sweep is complete set the NFA to autorange (press the
Scale key and the Autoscale menu item.
Step 9. Set the specification limit lines as follows:
1. Press the
Limit Lines key, then Limit Line 1⇑, Type Upper and Editor.
2. Set the first frequency to 10 MHz and the limit to 4.425dB, connected
to
Yes by default (press 1, 0, MHz, [—>|], 4, ., 4, 2, 5, Enter or X1).
3. Dependant on the NFA being tested, repeat 2. for the remaining
frequencies and limits as detailed in Figure 2-22 thru Figure 2-25.
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