Vertical Control
TDS 620A, 640A, & 644A User Manual
3Ć149
Bandwidth
To eliminate the higher frequency components, change the bandwidth of the
selected channel:
Press VERTICAL MENU ➞ Bandwidth (main) ➞ Full, 100 MHz, or 20 MHz
(side).
Fine Scale
Press VERTICAL MENU ➞ Fine Scale (main) to make fine adjustments to
the vertical scale using the general purpose knob or the keypad.
Position
Press VERTICAL MENU ➞ Position (main) to let the general purpose knob
control the vertical position. Press Set to 0 divs (side) if you want to reset the
reference point of the selected waveform to the center of the display.
Offset
Offset lets you subtract DC bias from the waveform, so the oscilloscope can
acquire the exact part of the waveform you are interested in.
Offset is useful when you want to examine a waveform with a DC bias. For
example, you might be trying to look at a small ripple on a power supply
output. It may be a 100 mV ripple on top of a 15 V supply. Using offset, you
can display the ripple and scale it to meet your needs.
To use offset, press VERTICAL MENU ➞ Offset (main). Use the general
purpose knob to control the vertical offset. Press Set to 0 V (side) if you want
to reset the offset to zero.
See
Acquisition
, on page 2-19.
See
Scaling and Positioning Waveforms,
on page 2-25.
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