Selecting Channels
3–112
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
These buttons are labeled CH 1, CH 2, CH 3, CH 4, and MORE. The MORE
button allows you to select internally stored Math and Ref waveforms. The
selected channel is indicated by the lighted LED by each button.
NOTE. If you select the 120K record length on a TDS 400A, then you can only
save one reference waveform. Also, you can only use/display four waveforms.
For example: if you display a math waveform that is the sum of CH 1 and CH 2,
even if CH 1 and CH 2 are not displayed, you have used three waveforms.
Therefore, you can only display one additional waveform.
Do the following steps to first display and then remove waveforms from the
display:
1. Press CH 1, CH 2, CH 3, or CH 4 to turn on as many of these channels as
desired. The one you select last becomes the selected channel. Selecting a
channel turns it on if it is not already on.
2. To turn OFF the display of the selected waveform, press the WAVEFORM
OFF button.
3. To select a math waveform or a reference waveform, press MORE and select
the waveform from the More menu. To remove the display of the waveform
selected in the More menu, press WAVEFORM OFF while the MORE
button is lit.
Waveform Priority
When you turn off a waveform, the digitizing oscilloscope automatically selects
the next highest priority waveform (see Figure 3–60).
1. CH1 (All models)
2. CH2 (All models)
3. CH3
(TDS 420A, TDS 460A, and TDS 510A)
4. CH4 (TDS 420A, TDS 460A, and TDS 510A)
5. MATH1
6. MATH2
7. MATH3
8. REF1
9. REF2
10. REF3
11. REF4
Figure 3–60: Waveform Selection Priority
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