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Tektronix 1502C User Manual

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Operating Instructions
1502C MTDR User Manual
1–21
The VIEW STORE button, when pushed on, displays the waveform stored in the
memory as a dotted line. If there is no waveform in memory, a message appears
on the LCD informing you of this.
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Figure 1–18: Display of a Stored Waveform
When pushed on, the VIEW DIFF button displays the difference between the
current waveform and the stored waveform as a dotted line. If no waveform has
been stored, a message will appear. The difference waveform is made by
subtracting each point in the stored waveform from each point in the current
waveform.
NOTE. If the two waveforms are identical (e.g., if STORE is pushed and VIEW
DIFF is immediately pushed) the difference would be zero. Therefore you would
see the difference waveform as a straight line.
The VIEW DIFF waveform will move up and down with the current input as you
move the 
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POSITION control. Any of the waveforms may be turned on or off
independently. You might want to turn off some waveforms if the display
becomes too busy or confusing.
NOTE. Because the stored waveform is not affected by changes in the instrument
controls, care should be taken with current waveform settings or the results
could be misleading.
One method to minimize the overlapping of the waveforms in VIEW DIFF is:
1. Move the waveform to be stored into the top half of the display.
Using VIEW STORE
Using VIEW DIFF