
574 Chapter13
Softkey Descriptions
Softkey Descriptions
CAL YTF Calibrate YTF
DESCRIPTION This function is available for 8592L, 8593E, 8595E, and
8596E spectrum analyzers only.
Note that the user should perform the CAL YTF routine
if there has been a large change in ambient
temperature. Since YTF tracking varies with
temperature, the
CAL YTF routine is required to meet
the unpeaked frequency response specification. Refer to
the calibration guide for your instrument.
In bands 1 through 4, amplitude accuracy, particularly
frequency response, is a function of how well the A3A8
YTF bandpass filter tracks the tuned frequency of the
analyzer. YTF tuning is controlled by DACs located on
the A7 analog interface assembly.
CAL YTF minimizes
amplitude uncertainty due to YTF tracking by
determining the optimum YTF DAC settings for each
band.
Be sure to use the YTF CAL cable when performing the
CAL YTF routine. Refer to the calibration guide for the
cable part number.
The CAL YTF routine, using the 100 MHz COMB GEN
OUT signal (except for the 8595E that uses the CAL
OUT signal), tunes the analyzer to two frequencies in
band 1, and one frequency each in band 2 through band
4. The routine minimizes tracking error by adjusting
the YTF coarse- and fine-tune DAC settings for an
optimum displayed-signal amplitude in each band.
TRACE A displays the typical frequency spectrum and
TRACE B displays the amplitude versus YTF DAC
setting.
The routine then sets the analyzer to sweep over the
frequency range of each band. The YTF Span DAC is
adjusted for the maximum swept-amplitude response
in each band. During this part of the routine,
TRACE A
displays the frequency spectrum, and TRACE B displays
the amplitude versus YTF span DAC setting.
Be sure to press CAL, CAL STORE after running the CAL
YTF routine.
R
ELATED SOFTKEYS CAL STORE
CAL MXR
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