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Measurement System
TDS 620A, 640A & 644A User Manual
3Ć85
TableĂ3Ć4:ăMeasurement Definitions (Cont.)
Name Definition
Period Timing measurement. Time it takes for the first complete signal cycle to hapĆ
pen in the waveform or gated region. The reciprocal of frequency. Measured
in seconds.
Positive Duty
Cycle
Timing measurement of the first cycle in the waveform or gated region. The
ratio of the positive pulse width to the signal period expressed as a percentĆ
age.
PositiveDutyCycle +
PositiveWidth
Period
100%
Positive OverĆ
shoot
Voltage measurement over the entire waveform or gated region.
PositiveOvershoot +
Max * High
Amplitude
100%
Positive Width Timing measurement of the first pulse in the waveform or gated region. The
distance (time) between MidRef (default 50%) amplitude points of a positive
pulse.
Rise time Timing measurement. Time taken for the leading edge of the first pulse in the
waveform or gated region to rise from a Low Ref value (default = 10%) to a
High Ref value (default = 90%) of its final value.
RMS Voltage measurement. The true Root Mean Square voltage over the entire
waveform or gated region.