Reference
or neg ative delay, that amount of delay m ight be automatically reduced
if y ou make the followin g additional control changes:
Change to a faster time-base setting
Change from Fast Trigger t o Normal acquisition resolution
If the delay reduction occurs, it may cause the waveform horizontal
position to shift.
Negative Delay. You can select up to ten div isions of negative delay. At
the fastest time base settings, you can use negative delay to see more o f
the waveform that occurs
before the trigger point.
Roll Mode Display. To obtain a rolli ng display similar to a strip-chart
recorder, turn off zoom and delay, select the Auto trigger mode, and set
the horizontal Scale control to 40 ms/div or slower. Subsequent changes
to the horizontal S cale cause th e roll-mode display to erase and r estart .
Math and FFT
Math and FFT functions are part of the Vertical menu group.
Math Waveform
PushtheMathbuttontodefine the math waveform using the math menu.
Also push the M ath button to display or select the math waveform. The
bottom menu will show other menu items when you have a TDS3AAM
application m od ule installed.
Bottom Side Description
Set 1st Source to Selects the first source
waveform.
Set Operator to Selects the math operator:
+, -, ×, or ÷
Dual Wfm Math
Set 2nd Source to Selects the second source
waveform.
TDS3000C Series O scilloscope User Manual 87
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