Tektronix CSA8000B - Manual (Page 267)

Appendix B: Automatic Measurements Reference
CSA8000B & TDS8000B User Manual B- 5
Table B- 1: Pulse Measurements — Amplitude (cont.)
Name Definition
Mid The computation of the middle point between the maximum and minimum amplitude peaks of
the waveform over the measurement region.
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.
For best results with this measurement, optimize the vertical resolution before taking this
measurement. See To Optimize the Vertical Resolution on page B--69.
Min The smallest amplitude value of the waveform over the measurement region.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2).
For best results with this measurement, optimize the vertical resolution before taking this
measurement. See To Optimize the Vertical Resolution on page B--69.
Optical Modulation
Amplitude The difference between the average power levels of the logic 1, High, and the logic 0, Low, of
the optical pulse signal. The levels are the Mean values of the logical levels sampled within an
Aperture of the logical 1 and 0 regions of the pulse. The logical 1 and 0 time intervals are
marked by the crossings of a reference level determined by the Average Optical Power (AOP) of
the signal.
Pulse OMA [watts]
= P1 − P0
Where:
H P1 and P0 are the average power levels of the logical 1 and 0, determined within the
respective apertures.
H The adjustable Aperture defaults to 20% center respectively of the logical 1 and
logical 0 time intervals.
If enabled, measurement gates constrain the measurement region to the area between the Start
Gate (G1) and Stop Gate (G2).
For best measurement results:·
Perform a vertical compensation. See Perform the Compensation on page1--20.
Perform a Dark Level compensation before taking this measurement. See To Perform
Dark-Level and User Wavelength Gain Compensations on page 3--98.