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Response Calibration
Response Calibration
A Response calibration measures and compensates for amplitude and phase dierences
between the test and reference paths (tracking errors). The comparison is done at the exact
point in the test setup that the device under test (DUT) is usually connected. In other words ,
if your DUT is normally connected at the end of a 5 meter cable , then the calibration standard
should be placed on the end of that cable during the calibration.
The basic purpose of the cal is to compensate for any attenuation or phase shift on either the
test or reference paths . The result of the calibration is that the test and reference paths look
nearly identical (electrically). The advantage is that systematic tracking errors are greatly
reduced.
A Response calibration requires a single standard class to measure the selected reference
path's frequency response (amplitude and phase). T o perform a calibration for reection
measurements , you can use an open or a short. F or transmission calibration use a \thru" (a
short cable). Refer to Figure 5-4.
Figure 5-4. Calibration Setup for Response Cal
When
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DONE is selected, the receiver calculates error coecients . The coecients modify
normal measurement data so any amplitude and phase dierences between test and reference
paths are minimized.
Both basic and service parameters can use this calibration method.
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