Agilent Technologies HP 8719D Service Manual page 327

Transmission Tracking (E!CF and ET&)
Transmission tracking is the difference between the frequency response of
the reference path (including R input) and the frequency response of the
transmission test path (including A or B input) while measuring transmission.
The response of the test port cables is included. These terms are characterized
by measuring the transmission (S21, S12) of the 'thru" configuration during the
measurement calibration. Note that coupler response is included in this error
term. Typically transmission tracking appears as a slope of O/-5 dB from 0.84
MHz, -15 at 100 MHz, and -20 at 50 MHz.
Significant System Components.
indicate a problem in the reference signal path (if both ETF and ETR are bad)
or in the A or B input path. The "thru" cable also has an effect on transmission
tracking.
Affected Measurements.
transmission tracking errors.
1 l-14 Error Terms
Large variations in this error term probably
All transmission measurements are affected by
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Figure 11-6. Typical ETF/ETE
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