Cursor Measurements
TDS 620A, 640A, & 644A User Manual
Time Units
You can choose to display vertical bar cursor results in units of time or fre-
quency. If you have Option 5 Video, you can also display the results in terms
of video line number.
Press CURSOR ➞ Time Units (main) ➞ seconds or 1/seconds (Hz) or,
with Option 5, video line number (side).
Amplitude Units
If you are measuring NTSC signals, you can choose to display vertical read-
ings in IRE units. If you are trying to do this, you should have option 05 Video
Trigger installed as it would be difficult to trigger on composite video wave-
forms without option 05.
Press CURSOR ➞ Amplitude Units (main) ➞ IRE (NTSC)
To return to normal:
Press CURSOR ➞ Amplitude Units (main) ➞ Base
Cursor Speed
You can change the cursors speed by pressing SHIFT before turning the
general purpose knob. The cursor moves faster when the SHIFT button is
lighted and the display reads

Coarse Knobs

in the upper right corner.
See
Measurements
, on page 2-30.
See
Waveform Math
, on page 3-159, for information on cursor units with
multiplied waveforms.
See
Fast Fourier Transforms
on page 3-38,
Waveform Differentiation
on
page 3-150, and
Waveform Integration
on page 3-154

,

if your oscilloscope is
equipped with Option 2F Advanced DSP Math (standard on the TDS 524A &
TDS 644A), for information on cursor units with integrated, differentiated, and
FFT waveforms.
See the

TDS Family Option 05 Video Trigger Interface,

if your oscilloscope is
equipped with the video trigger option, for information on cursor units with
video waveforms.
For More
Information