HP 8530A, Руководство по эксплуатации и программированию, Страница: 112 / 439

Response and Isolation Calibration
Error Correction Now Goes ON
The receiver will now turn calibration ON automatically . Y ou can now make calibrated
measurements .
Response and Isolation Calibration
A Response calibration reduces tracking errors . Tracking errors are phase and magnitude
systematic dierences in the test and reference paths . This subject is discussed in more detail
in Response Calibration, earlier in this section. The response portion of this calibration will
greatly reduce measurement errors caused by tracking dierences .
The isolation calibration reduces the eects of crosstalk, which will improve the dynamic range
of the system. Isolation cal is of great benet when measuring lters or attenuators . High
dynamic range helps assure that low-level signals are not masked by crosstalk responses .
The response and isolation calibration requires two standard classes . The calibration standards
you need for the response calibration depends on whether you are making a reection or
transmission measurement.
R esponse Calibration
F or reection calibration you need to use an open or a short. F or transmission calibration use a
\thru" (a short cable). Refer to Figure 5-4.
Isolation Calibration
Isolation calibration requires the use of one or two loads . Refer to Figure 5-6. If you are
calibrating for reection measurements , place a single load as shown. If you are calibrating for
transmission measurements , place two loads as shown in Figure 5-6
Figure 5-6. Calibration Setup for Isolation Cal
Figure 5-7 shows the error model for transmission/reection response and isolation errors .
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