User`s guide

6-44

Calibrating for Increased Measurement Accuracy

Calibrating for Noninsertable Devices

16.To save the results of the new cal set, press

NOTE Adapter removal can leave a residual state in internal memory. This is not a

valid instrument state and should be deleted.

Figure 6-16 Calibrated Measurement

Verify the Results

Since the effect of the adapter has been removed, it is easy to verify the accuracy of the

technique by simply measuring the adapter itself. Because the adapter was used during

the creation of the two cal sets, and the technique removes its effects, measurement of the

adapter itself should show the S-parameters.

If unexpected phase variations are observed, this indicates that the electrical delay of the

adapter was not speciﬁed within a quarter wavelength over the frequency range of

interest. To correct this, recall both cal sets, since the data was previously stored to disk,

change the adapter delay, and press .

Your analyzer’s programmer’s guide contains an example program that demonstrates the

adapter removal process over GPIB.

Save/Recall

SELECT DISK

INTERNAL MEMORY

RETURN

SAVE STATE

REMOVE ADAPTER