View And Interpret The Conversion Loss Results - HP 8712ES User Manual

View and Interpret the Conversion Loss
Results
1. If necessary to view the measurement trace, press
Autoscale .
2. To interpret the conversion loss measurement, refer to
"Example of a Conversion Loss Measurement,"
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:
Conversion Loss dB
where P = the power measured at the IF output of the mixer
trans
and where P
inc
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
Max Search Mkr
ES User's Guide
( )
= the incident power at the RF input.
MARKER
−
> Max .
Making Measurements
Measuring Conversion Loss
SCALE
Figure 3-28,
or your analyzer's
P
 
trans
------------- -
= 10 log
 
P
inc
Marker Search
3-65