ES User’s Guide 3-65
Making Measurements
Measuring Conversion Loss
View and Interpret the Conversion Loss
Results
1. If necessary to view the measurement trace, press
.
2. To interpret the conversion loss measurement, refer to Figure 3-28,
“Example of a Conversion Loss Measurement,” or your analyzer's
display if you are making this measurement on your instrument.
a. The values shown on the horizontal axis represent the source RF
output. The values shown on the vertical axis are the power ratio
in decibels (dB) of the transmitted signal through the device
divided by the incident power. To display the result in logarithmic
magnitude format (designated by Log Mag at the top of the
measurement screen), the analyzer computes the measurement
trace using the following formula:
where P
trans
= the power measured at the IF output of the mixer
and where P
inc
= the incident power at the RF input.
b. A level of 0 dB would indicate a perfect device (no loss or gain).
Values greater than 0 dB indicate that the mixer has gain. Values
less than 0 dB indicate mixer conversion loss.
3. If you wish, you can quickly determine the mixer's minimum
conversion loss by pressing
.
SCALE
Conversion Loss dB() 10 log
P
trans
P
inc
--------------
=
MARKER
−
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