Rf Feedthrough - Agilent Technologies 8753ET User Manual

Making Mixer Measurements
Isolation Example Measurements
7. To adjust the display scale, press:
Scale Ref
AUTO SCALE
The measurement results show the mixer's LO to RF isolation.
Figure 2-35 Example Mixer LO to RF Isolation Measurement

RF Feedthrough

The procedure and equipment configuration necessary for this measurement are very
similar to those of the previous LO to RF Isolation procedure, with the addition of an
external source to drive the mixer's LO port as we measure the mixer's RF feedthrough.
RF feedthrough measurements do not use the frequency offset mode.
1. Select the CW LO frequency and source power from the front panel of the external
source.
CW frequency = 300 MHz
Power = 10 dBm
2. Initialize the analyzer by pressing
3. To select the analyzer frequency range and source power, press:
Start 10 M/µ
Stop 3000
0
PWR RANGE MAN
Power
This source stimulates the mixer's LO port.
2-46
Preset
M/µ
x1
.