Taking Measurements
TDS 310, TDS 320 & TDS 350 Instruction Manual
333
Table31:Measurement Definitions
Name
Definition
Period
Timing measurement. Time it takes for the first complete signal cycle to hap
pen in the waveform or gated region. The reciprocal of frequency. Measured in
seconds.
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 se
cond.
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.
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.
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.
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.
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 percentage.
PositiveDutyCycle + PositiveWidth
Period
100%
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 percent
age.
NegativeDutyCycle +
NegativeWidth
Period
100%
Burst Width
Timing measurement. The duration of a burst. Measured over the entire wave
form or gated region.
Positive
Overshoot
Voltage measurement over the entire waveform or gated region.
PositiveOvershoot +
Max * High
Amplitude
100%
Negative
Overshoot
Voltage measurement. Measured over the entire waveform or gated region.
NegativeOvershoot + Low * Min
Amplitude
100%
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). Measured over the entire
waveform or gated region.
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