Agilent Technologies 35670A Manual page 294

Dynamic signal analyzer gpib programming

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Your selection of measurement data (CALC:FEED) and trace coordinates (CALC:FORM) affects

reference level tracking.

When linear magnitude trace coordinates are selected, the bottom reference is kept at 0 (zero). The

height of the vertical division of the trace (DISP:TRAC:Y:PDIV) is changed so the top reference is

the input range.

When logarithmic magnitude trace coordinates are selected, the top reference is kept at the input

When the real or imaginary trace coordinates are selected, the center reference is set to 0 (zero). The

height of the vertical division of the trace (DISP:TRAC:Y:PDIV) is changed so the top reference is 

the input range.

Reference level tracking is not allowed for the following:

phase trace coordinates (CALC:FORM:PHAS and CALC:FORM:UPH)

frequency response measurement data (CALC:FEED 'XFR:POW:RAT 2,1')

coherence measurement data (CALC:FEED 'XFR:POW:COH 1,2')

user math data (CALC:MATH:STAT ON)

Reference level tracking is disabled when autoscaling is turned on (DISP:TRAC:X:AUTO or

DISP:TRAC:Y:AUTO). It is also disabled when the height of the vertical division

(DISP:TRAC:Y:PDIV) changes for real (CALC:FORM REAL), imaginary (CALC:FORM IMAG) or

linear magnitude (CALC:FORM MLIN) trace coordinates.