2-47
Making Mixer Measurements (Option 089 Only)
Isolation Example Measurements
7. To adjust the display scale, press:
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:
( , 8722ES)
This source stimulates the mixer’s LO port.
4. To select a ratio B/R measurement, press:
Scale Ref
AUTO SCALE
Preset
Start 10 M/µ
Stop 3000 M/µ
Power 0
PWR RANGE MAN
x1
−10 x1
Meas
INPUT PORTS
B/R