8. To make a response error-correction, press:
9. Replace the “calibration” mixer with the device under test. If measuring group delay, set
the delay equal to the “calibration” mixer delay (for example -0.6 ns) by pressing:
10. Scale the data for best vertical resolution.
Ctll
*
PRm
Cor
Del
Smo
Hld
Ofs
-CENTER
.300
000 000
GHz
SPAN
.lOO
000 000
GHz
Figure 3-18. Group Delay Measurement Example
The displayed measurement trace shows the device under test delay, relative to the
“calibration” mixer. This measurement is also useful when the device under test has built-in
llltering,
which requires
>30
dl3
range (the
maximm
of R input). PORT 1 to PORT 2 range is
>lOO
dl3.
3-26
Making Mixer Measurements