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Display Modes
TDS 620A, 640A & 644A User Manual
3Ć29
Filter Type
The display filter types are sin(x)/x interpolation and linear interpolation. For
more information see the Concepts section, page 2Ć20.
Press DISPLAY ➞ Filter (main) ➞ Sin(x)/x Interpolation or Linear InterpoĆ
lation (side).
NOTE
When the horizontal scale is set to rates faster than 25 ns/div, or
when using the ZOOM feature to expand waveforms horizontally,
interpolation occurs. (The filter type, linear or sin(x)/(x), depends on
which is set in the Display menu.) Otherwise, interpolation is not
needed. See Sampling and Digitizing on page 2Ć19 for a discusĆ
sion of sampling including interpolation.
Graticule Type
To change the graticule:
Press DISPLAY ➞ Graticule (main) ➞ Full, Grid, Cross Hair, Frame, NTSC
or PAL (side).
H Full provides a grid, cross hairs and a frame.
H Grid displays a frame and a grid.
H Cross Hair provides cross hairs, and a frame.
H Frame displays just a frame.
H NTSC provides a grid useful for measuring NTSCĆclass waveforms.
H PAL provides a grid useful for measuring PALĆclass waveforms.
NOTE
Selecting either NTSC or PAL graticules automatically changes the
vertical scale, position settings, coupling, and sets to zero any
vertical offset of any channel displayed. These settings are not
restored after switching to other graticule types. Therefore, you
might wish to recall the factory setup or other stored setup after
selecting a different graticule.
Format
There are two kinds of format: YT and XY.
YT is the conventional oscilloscope display format. It shows a signal voltage
(the vertical axis) as it varies over time (the horizontal axis).