HP 8753E User Manual page 235

Note
You can save or store the measurement correction to use for later
measurements. Refer to the "Printing, Plotting, and Saving Measurement
Results" chapter for procedures.
7. This completes the receiver calibration for transmission measurements. You can connect and
measure your device under test.
Note
The accuracy of the receiver calibration will be nearly the same as the test
port power accuracy; and the test port power accuracy can be significantly
improved by performing a power meter source calibration, as described later in
this chapter.
Optimizing Measurement Results 6-13