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C O U P L E D F U N C T I O N
Zero Attenuation
a precaution to protect the spectrum analyzer's input mixer, 0 dB RF attenuation can only be selected from the
As
number/units keyboard, press (,,,.1 @(x-
Reference Levels I - 100 dBm and > + 30 dBm
Reference levels 5 - 100 dBm or between + 30 dBm and + 60 dBm can be called when the reference level
extended range is activated. Low reference level limits depend upon resolution bandwidth and scale.
I
Press m (,1,.1 to extend the reference level range.
See Chapter 3, FUNCTION (F) , and Chapter 11, (,.,,, KEY FUNCTIONS.
Determining Distortion Products
If the total power to the analyzer is overloading the input mixer, distortion products of the input signals can be
displayed as real signals. The RF attenuator can be used to determine which signals, if any, are internally generated
distortion products.
Example
The two main signals shown are producing intermod-
ulation products because the analyzer's input mixer is
overloaded.
To determine whether these intermod products are
generated by the analyzer, first save the spectrum dis-
played in B with @I B B B.
INPUT Al7ENUATlON
Manual Operation 75
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