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B-56
CSA8000B & TDS8000B User Manual
Measurement Reference Parameters and Methods
This reference topic describes the reference parameters (levels and crossings)
used in taking the measurements.
All Sources
The methods available for calculating reference levels used in taking automatic
measurement follow. The methods are shown using a pulse, but they also apply
to RZ and NRZ waveforms.
Reference level calculation methods
High (50mV)
High reference
Mid reference(0 mV)
Low reference
Low (--50 mV)
90%
10% 90 mV
10 mV
-- 40 mV
40 mV
90 mV
10 mV
50% 50 mV 50 mV 0 mV
1. RelativeReference is calculated as percentageof the High/Low range.
2. HighDelta Reference is calculated as theabsolute values from the High Level.
3. LowDelta Reference is calculated as absolutevalues fromthe Low Level.
4. AbsoluteReference is set byabsolute values inuser units.
5. AOP(not shown) measuresthe Average Optical Powerof the waveformand uses it
as the Mid Reflevel. SeePulse Crossings andMid-reference LevelAOP on page
B--58 for more information.
Figure B- 1: Reference-level calculation methods
Reference-Level
Calculation Methods