Appendix B: Automatic Measurements Reference
B- 10
CSA8000B & TDS8000B User Manual
Table B- 2: Pulse Measurements - Timing (cont.)
Name
Definition
- Duty Cycle
The ratio (expressed as a percentage) of the first negative pulse width within the measurement
region to the period of the signal. The time intervals are determined at mid-reference level.
If Tcross1 is positive, then:
If Tcross1 is negative, then:
Tcross1, Tcross2 and Tcross3 are the times of the first three consecutive crossings at the
mid-reference level.
The mid-reference levels are adjustable and default to 50% of the pulse amplitude.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2). See
To Localize a Measurement
on page 3--83.
−
Duty Cycle
=
100
×
(
Tcross3
−
Tcross2
)
(
Tcross3
−
Tcross1
)
−
Duty Cycle
=
100
×
(
Tcross2
−
Tcross1
)
(
Tcross3
−
Tcross1
)
Fall Time
The time interval between times of the high reference level and the low reference level
crossings on the negative slope of the pulse.
RZ Fall Time = TcrossL – TcrossH
Where:
H
TcrossL is the time of the crossing of the low reference level
H
TcrossH is the time of crossing of the high reference level.
The low reference and high reference levels are adjustable and default to 10% and 90% of the
pulse amplitude. There are four Reference Level Calculation methods available for determining
these reference levels. See
Measurement Reference Parameters and Methods
on page B--56 or
in the online help and in Also see
Reference Levels Method
on page 3--79.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2). By default, the algorithm searches forward from the Start Gate
for the first falling edge, but the Direction of traversal can be reversed, so that the search will be
backward from the Stop Gate. See
To Localize a Measurement
on page 3--83.
Frequency
The inverse of the Period of the signal.
Where Tcross3 and Tcross1 are the times of the first two consecutive crossings on the
same slope at the mid-reference level. See
Pulse Crossings and Mid-reference Level
on
page B--58.
The mid-reference level is adjustable and defaults to 50% of the pulse amplitude.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2).
Frequency
=
1
(
Tcross3
−
Tcross1)
Содержание CSA8000B Series
Страница 4: ......
Страница 18: ...Preface xiv CSA8000B TDS8000B User Manual ...
Страница 26: ...Check the Package Contents 1 8 CSA8000B TDS8000B User Manual ...
Страница 62: ...Accessories and Options 1 44 CSA8000B TDS8000B User Manual ...
Страница 76: ...Overview 3 2 CSA8000B TDS8000B User Manual ...
Страница 112: ...Acquiring Waveforms 3 38 CSA8000B TDS8000B User Manual ...
Страница 126: ...Triggering 3 52 CSA8000B TDS8000B User Manual ...
Страница 146: ...Displaying Waveforms 3 72 CSA8000B TDS8000B User Manual ...
Страница 174: ...Measuring Waveforms 3 100 CSA8000B TDS8000B User Manual ...
Страница 186: ...Creating Math Waveforms 3 112 CSA8000B TDS8000B User Manual ...
Страница 214: ...Data Input and Output 3 140 CSA8000B TDS8000B User Manual ...
Страница 353: ......
Страница 354: ......