TakingMeasurements
Operation
334
Table31:Measurement Definitions (Cont.)
Name
Definition
Low
The value used as 0% whenever High Ref, Mid Ref, and Low Ref values are
needed as in fall time and rise time measurements. Measured over the entire
waveform or gated region.
Maximum
Voltage measurement. The maximum amplitude. Typically the most positive
peak voltage. Measured over the entire waveform or gated region.
Minimum
Voltage measurement. The minimum amplitude. Typically the most negative
peak voltage. Measured over the entire waveform or gated region.
Peak to Peak
Voltage measurement. The absolute difference between the maximum and
minimum amplitude in the entire waveform or gated region.
Amplitude
Voltage measurement. The high value less the low value measured over the
entire waveform or gated region.
Amplitude = High - Low
Mean
Voltage measurement. The arithmetic mean over the entire waveform or gated
region.
Cycle Mean
Voltage measurement. The arithmetic mean over the first cycle in the wave
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.
RMS
Voltage measurement. The true Root Mean Square voltage over the entire wa
veform or gated region.
Remove a Measurement
Press the main menu button Remove
Measrmnt. Use the top four side menu buttons to remove specific measure
ments or use the lowest side menu button to remove all measurements.
Use Gating
By default, TDS 300 Series oscilloscopes take automated
measurements on the entire waveform record. If you want a measurement of
only a portion ofthe waveform, you can use gating to mark the boundaries of
that portion. Use this procedure to gate" a signal.
1. Press the main menu button Select Measrmnt for....
2. Ifnecessary, press the lowermost side menu button (labeled -more- x
out of 6) to page through the available measurements until the measure
ment you want to take appears in the side menu.
3. Then press one ofthe top four side menu buttons to activate a particular
measurement.
4. Press the main menu button Gating.
5. Press the side menu button Gate with V Bar Cursors.
6. Use the General Purpose Knob to set one cursor to the left edge of your
gate.
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