Measurements
R&S
®
RTM20xx
90User Manual 1317.4726.02 ─ 01
Pulse Width (negative pulse)
: Measures the width of a negative pulse. A negative pulse consists of a falling edge
followed by a rising edge. The measurement requires at least one complete period of a
triggered signal. The measured value is displayed as "t
" in the result table.
Duty Cycle +
Measures the positive duty cycle. The duty cycle is the ratio between the duration of a
positve pulse (high active) and the period of a rectangular waveform. The measurement
requires at least one complete period of a triggered signal.
The result is the measured value as a percentage of the signal period and is displayed
as "Dty+" in the result table.
Duty Cycle -
Measures the positive duty cycle. The duty cycle is the ratio between the duration of a
negative pulse (low active) and the period of a rectangular waveform. The measurement
requires at least one complete period of a triggered signal.
The result is the measured value as a percentage of the signal period and is displayed
as "Dty-" in the result table.
Rise Time
Measures the rise time of the left-most rising edge within the displayed section of the
waveform. The rise time is determined as the time it takes the signal to rise from the lower
reference level to the upper reference level which are set with "Upper Level" and "Lower
Level" in the "Reference Level" menu. The measurement result is displayed as "tr" in the
result table.
See also: "Reference Level: Upper, Middle, Lower Levels" on page 97.
Fall Time
Measures the falling time of the left-most falling edge within the displayed section of the
waveform. The fall time is determined as the time it takes the signal to fall from the upper
reference level to the lower reference level which are set with "Upper Level" and "Lower
Level" in the "Reference Level" menu. The measurement result is displayed as "tf" in the
result table.
σ-Std. Dev. Wave
Measures the standard deviation of the complete waveform.
Eval
N
i
Mean
Eval
X
Xix
N
1
2
)(
1
1
X
Mean
= Mean Value
X(i) = Value of the measured waveform sample
N
Eval
= Number of waveform samples
σ-Std. Dev. Cycle
Measures the standard deviation of one cycle, usually of the first, left-most signal period.
Automatic Measurements
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