TDS 620A, 640A, & 644A User Manual
Saving and Recalling Waveforms
You can store a waveform in any of the four internal reference memories of
the digitizing oscilloscope. That information is retained even when you turn
the oscilloscope off or unplug it. You can save any combination of different
size waveform records.
The digitizing oscilloscope can display up to 11 waveforms at one time. That
includes waveforms from the four input channels, four reference waveforms,
and three math waveforms.
You will find saving waveforms useful when working with many waveforms
and channels. If you have more waveforms than you can display, you can
save one of the waveforms and then stop acquiring it. That lets you display
another waveform without forcing you to loose the first one.
To save a waveform, do the following steps:
1. Select the channel that has the waveform you want to save.
Before doing step 2 that follows, note that if you choose a reference
memory location labeled

active

(see Figure 3-69), you will overwrite
the waveform that was previously stored there. You can store wave-
forms in reference locations labeled

empty

without disturbing pre-
viously stored waveforms.
2. To store a waveform internally, press save/recall WAVEFORM ➞ Save
Waveform (main) ➞ Ref1, Ref2, Ref3, Ref4, or File (side).
To store a waveform to disk (optional on the TDS 620A & TDS 640A),
press To File. Then use the general purpose knob to select the exact file
from the resulting scrollbar list. Finally, press the side-menu Save To
Selected File to complete the operation.
Operation