Rf Feedthrough - Agilent Technologies 8719ES User Manual

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