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TDS 620A, 640A & 644A User Manual
3Ć83
Measurement System
There are various ways to measure properties of waveforms. You can use
graticule, cursor, or automatic measurements. This section describes autoĆ
matic measurements; cursors and graticules are described elsewhere. (See
Cursor Measurements on page 3Ć15 and Measurements on page 2Ć26.)
Automatic measurements are generally more accurate and quicker than, for
example, manually counting graticule divisions. The oscilloscope will continĆ
uously update and display these measurements. (There is also a way to
display all the measurements at once Ċ see Snapshot of Measurements on
page 3Ć92.)
Automatic measurements calculate waveform parameters from acquired
data. Measurements are performed over the entire waveform record or the
region specified by the vertical cursors, if gated measurements have been
requested. (See page 3Ć88 for a discussion of gated measurements.) They
are not performed just on the displayed portions of waveforms.
The TDS 600A Digitizing Oscilloscope provides you with 25 automatic meaĆ
surements (see Table 3Ć4).
The following are brief definitions of the automated measurements in the
digitizing oscilloscope (for more details see Appendix C: Algorithms,
page AĆ7).
TableĂ3Ć4:ăMeasurement Definitions
Name
Definition
Amplitude Voltage measurement. The high value less the low value measured over the
entire waveform or gated region.
Amplitude = High - Low
Area Voltage over time measurement. The area over the entire waveform or gated
region in voltĆseconds. Area measured above ground is positive; area below
ground is negative.
Cycle Area Voltage over time measurement. The area over the first cycle in the waveform,
or the first cycle in the gated region, in voltĆseconds. Area measured above
ground is positive; area below ground is negative.
Burst Width Timing measurement. The duration of a burst. Measured over the entire waveĆ
form or gated region.
Cycle Mean Voltage measurement. The arithmetic mean over the first cycle in the waveĆ
form or the first cycle in the gated region.
Cycle RMS Voltage measurement. The true Root Mean Square voltage over the first cycle
in the waveform or the first cycle in the gated region.
Definitions