The following procedure illustrates how to use the Receiver Leveling feature to extend the power sweep range of the PNA, sometimes to 60 dB. Your actual sweep range may vary depending on the power offset setting and maximum available power at each frequency.
With PNA internal leveling, the power sweep range is limited to the range of the internal PNA source which is about 30 to 40 dB depending on the frequency range. See Power Sweep Range in the specs.
Note: You may not be able to achieve 60 dB of power sweep on your PNA. This is NOT specified.
With the use of source attenuation, the low power setting can be adjusted down to -95 dBm.
Without source attenuation, receiver leveling extends the low power setting to about -60 dBm. This is done by measuring and adjusting the source power at every data point. Because power levels are very low, noise must be reduced using IFBW or Averaging.
Click Stimulus, then Sweep Type, then Power Sweep - Enter sweep range: - 60 to 0 dBm
Set CW frequency of the measurement. Click OK.
Click Stimulus then Power and Attenuators. Click Leveling Mode then Receiver-R1
Click Receiver Leveling button.
Clear ALC ON checkbox.
When the measured power level falls below some level, the message appears: Power set to min power level.
Click Response then Avg or IF Bandwidth to reduce the amount of noise on the measurement.
Adjust the scale.
For troubleshooting purposes, display R1 trace to view the power level at test port 1.
Last Modified:
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26-Aug-2010 |
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