HP 54520 Series - Page 144

Define Measure Menu
Waveform Compare Menu
Compare Softkey
The compare softkey selects the channel or function for comparison to the
memory pair.
To Softkey
The to softkey selects the memory pair, ml and m2 or m3 and m4, for
comparison to the chosen input channel or function. Make sure that ml is
greater than m2 for all values across the screen when memory pair ml & m2
is selected. When memory pair m3 & m4 is selected, make sure that m3 is
greater than m4 for all values across the screen. If m1 is less than m2 or if
m3 is less than m4, the compare test fails. The display is misleading in this
case because the waveform appears to be in the bounds of the memory pair.
Allowance Softkey
When a point on the waveform fails the compare test, the point is tested
again against the allowance set with the allowance softkey. Allowance
refers to the distance a point may be above the upper mask or below the
lower mask and still pass the compare test. The distance is measured in
divisions. The allowance range is from 0 to 8 divisions in 1/40 division
increments. Figure 8-2 is a flow chart of the waveform comparison test.