HP HP 8712ES, User Manual, Page: 243 / 507

ES User’s Guide 5-19
Optimizing Measurements
Compensating for Phase Shift in Measurement Setups
To use the port extension feature, press
. When port extension is
turned on, you can add delay independently to both ports.
To add delay between PORT 1 and your DUT, press ,
and enter the delay value.
To add delay between PORT 2 and your DUT, press ,
and enter the delay value.
TIP
A good way to know when you have added enough delay is to connect a
short in place of the DUT. Adjust the port extension until the phase
response is flat. (Remember that most short-circuit standards have a
nonzero delay, so adjusting delay using this method will result in a delay
error equal to two times the short delay.)
The delay values that you enter will be automatically applied
appropriately to both transmission and reflection measurements. For
example, when measuring S
11
, the port 1 extension delay is applied
twice. When measuring S
21
, the port 1 extension delay and the port 2
extension delay are each applied once.
CAL
More Cal
Port Extensions Port Ext's on OFF
Port 1 Extension
Port 2 Extension