Technical data

Chapter 16 423
Spectrum Analyzer
Using the Spectrum Analyzer
Spectrum Analyzer
the output at the end of the RF test cabling is –113 dBm.
Example: If you want to set the signal generator to –113 dBm, the attenuator and RF
cabling measures 42.51 dB (measured with the 2 port insertion loss measurement
screen prior to this test), the RF OUT Loss field is turned
On (with the 42.51 dB loss
value entered). The actual RF output of the signal generator is –70.49 dBm, the
attenuator and RF cabling attenuated the signal to the desired level; so the RF signal
at the end of the test cable/attenuator is –113 dBm. This also points out the
importance of accurately measuring the loss of the attenuator and connecting cables.
Setting Average, Sweep, and Restart
Setting the Sweep
You can select either continuous or single sweep. Continuous sweep provides
repeated, ongoing measurements. Single sweep performs a single measurement that
is repeated only when you push the Single button.
To set sweep:
Setting Averaging
You can choose to have averaging on or off and set the number of averages you want
to take. You can select from the following types of averaging:
• Off: Disables averaging.
• Running: Computes the new result as the weighted sum of the last result and the
new measurement. The last result is weighted by (n – 1)/n. The new result is
weighted by 1/n. Each new measurement produces a new result.
• Max Hold: Is not an average, but on a point by point basis, displays the
maximum amplitude for the given frequency or channel since Max Hold was
turned on. It is updated when a new maximum occurs.
• Group Average: Makes the requested number of measurements, averages the
measurement data, and displays the average as a single result trace.
Step Notes
1 [Average/Sweep]
2 [Continuous] or [Single] Each time you press one of these
menu keys, the selected option
changes.