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Measurements
Operating Basics
2Ć28
H Tracking mode cursors operate in tandem: you move both cursors at the
same time using the general purpose knob. To adjust the solid cursor
relative to the dashed cursor, you push the SELECT button to suspend
cursor tracking and use the general purpose knob to make the adjustĆ
ment. A second push toggles the cursors back to tracking.
You can read more detailed information about how to use cursors in Cursor
Measurements, beginning on page 3Ć15.
Graticule Measurements
Graticule measurements provide you with quick, visual estimates. For examĆ
ple, you might look at a waveform amplitude and say it is a little more than
100ĂmV."
You can perform simple measurements by counting the number of major
and minor graticule divisions involved and multiplying by the scale factor.
For example, if you counted five major vertical graticule divisions between
the minimum and maximum values of a waveform and knew you had a scale
factor of 100ĂmV/division, then you could easily calculate your peakĆtoĆpeak
voltage:
5 divisions × 100ĂmV/division = 500ĂmV.
NOTE
AUX 1 and AUX 2 (TDS 620A) can not be set to the volts per division
needed to match video graticules.
When you select the NTSC graticule, the volts per division of all selected
channels is set to 143 mV/div (152 mV/div for PAL) where the divisions are
those of the conventional graticule, not the divisions of the video graticules.
For NTSC, the actual grid lines represent 10 IRE, and for PAL the lines are
100 mV apart.
See Appendix B: Algorithms, on page AĆ7, for details on how the digitizing
oscilloscope calculates each automatic measurement.
See Cursor Measurements, on page 3Ć15, for more information on cursor
measurements.
See Measurement System, on page 3Ć83, for more information on automatic
measurements.
See Tutorial Example 3: Automated Measurements, on page 1Ć18, for more
information on automatic measurements.
See Waveform Math, on page 3Ć148, for using cursors to measure math
waveforms.
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