Chapter 2 59
Test Descriptions
Noise Figure Range and Accuracy
6. Set the frequency to 50 MHz (press the Frequency/Points key and Fixed
Freq
, 5, 0, MHz).
7. Set the averaging to 101 (press the
Averaging/Bandwidth key and
Average Mode (Point), Averages, 1, 0, 1, Enter, Averaging On).
8. Select the display to meter mode (press the
Format key and Format,
Meter).
9. Fix the IF Gain (press the
System key then More, More and Service.
Press
Enter Password, then -2010 and Enter. Then press Service , IF
Test
and Fix IF Gain On. Set the IF Gain Value to 16 and press IF Gain
Value, 1, 6
and Enter.
Step 5. Restart the NFA measurement sweep by pressing the
Restart key.
Step 6. Record the measured P
hot
value in the Worksheet as the -54dB Ref 1
Level.
Step 7. Step the attenuator in 1dB steps from 1 - 11dB recording the measured
P
hot
at each point in the Worksheet as the -55 to -65dB levels. Remember
to press the
Restart key at each measurement.
Step 8. Set the synthesizer power level to -65dBm (press the
Power Level key,
then
-, 6, 5, dB(m)).
Step 9. Reset the attenuator to 0dB and press the
Restart key to restart the NFA
sweep.
Step 10. Record the measured P
hot
value in the Worksheet as the -65dB Ref 2
Level.
Step 11. Step the attenuator in 1dB steps from 1 - 11dB recording the measured
Phot at each point in the Worksheet as the -66 to -76dB levels.
Remember to press the
Restart key at each measurement.
Step 12. Reset the IF Gain (press the
System key then More, More and Service.
Press
Enter Password, then -2010 and Enter. Then press Service , IF Test
and
Fix IF Gain Off).
Step 13. Enter the attenuator metrology data information in the Worksheet
provided as Actual Attenuation using equation 1.
Step 14. Calculate the Measured Attenuation and enter the values in the
Worksheet using equation 2.
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