Tektronix 7D20 Operator's Manual page 78

Press
Remarks
Display
VPDNb (VERTICAL
POSITION
DOWN . Press and hold this
key to return the cursor
waveform to its original
position . Movement of the
waveform stops when the
original zero reference
position is reached . Release
the key and notice that the
original VZR readout is
restored and that neither
the VPUP4 key nor the
VPDNb key is illuminated .
Operating Inst ructions-7D20
'~ 1111l~1'11'~1' ' '
~~
~~rrrr~rr~r~r~
y/li/li/i~/i
1
1
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VPDN b
A single press of this key
will now cause the cursor
waveform to move down
incrementally and illumin-
ate the VPDNb key . As with
the VPUP4 key, continuous
movement of the waveform
will result if you press and
hold this key . Position the
displayed waveform some-
what below center .
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HOLD
Turns off the HOLD function
and allows the 7D20 to
resume
digitizing into
waveform memory 1 . The
HOLD key will extinguish .
Notice the trace returns to
its original position because I~~
the vertical position keys
-, f -,
don't
affect a cursor
waveform that is not in
HOLD .
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