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Measuring Waveforms
TDS 500C, TDS 600B, & TDS 700C User Manual
3–115
Table 3–10: Measurement definitions (cont.)
Name Definition
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.
Delay Timing measurement. The time between the MidRef crossings of two different traces or the
gated region of the traces.
Fall Time Timing measurement. Time taken for the falling edge of the first pulse in the waveform or gated
region to fall from a High Ref value (default = 90%) to a Low Ref value (default =10%) of its
final value.
Frequency Timing measurement for the first cycle in the waveform or gated region. The reciprocal of the
period. Measured in Hertz (Hz) where 1 Hz = 1 cycle per second.
High The value used as 100% whenever High Ref, Mid Ref, and Low Ref values are needed (as in fall
time and rise time measurements). Calculated using either the min/max or the histogram method.
The min/max method uses the maximum value found. The histogram method uses the most
common value found above the mid point. Measured over the entire waveform or gated region.
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). May be calculated using either the min/max or the histogram
method. With the min/max method it is the minimum value found. With the histogram method, it
refers to the most common value found below the midpoint. 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.
Mean Voltage measurement. The arithmetic mean 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.
Negative Duty Cycle Timing measurement of the first cycle in the waveform or gated region. The ratio of the negative
pulse width to the signal period expressed as a percentage.
NegativeDutyCycle +
NegativeWidth
Period
100%
Negative Overshoot Voltage measurement. Measured over the entire waveform or gated region.
NegativeOvershoot +
Low * Min
Amplitude
100%
Negative Width Timing measurement of the first pulse in the waveform or gated region. The distance (time)
between MidRef (default 50%) amplitude points of a negative pulse.
Peak to Peak Voltage measurement. The absolute difference between the maximum and minimum amplitude
in the entire waveform or gated region.