The following figure shows a falling edge with the two edges necessary to calculate a Fall measurement. The figure shows the
default high reference level which is 90% of Top and the default low reference level which is 10% of Base.
1. Searching from Start to End, find the first sample in the measurement zone greater than HighRef.
2. From this sample, continue the search to find the first (negative) crossing of edge of HighRef. The time of this edge is THF.
(Use interpolation if necessary.)
Figure 11: Fall Time
3. From THF, continue the search, looking for a crossing of LowRef. Update THF if subsequent HighRef crossings are found.
When a LowRef crossing is found, it becomes TLF. (Use interpolation if necessary.)
4. FallTime = TLF – THF
Frequency measurement algorithm
Frequency is the reciprocal of the period. Frequency is typically measured in Hertz (Hz) where 1 Hz = 1 cycle per second.
Frequency = 1 / Period
High Time measurement algorithm
High Time is the amount of time that a waveform cycle is above the High reference voltage level.
The application calculates the measurement using the following equation:
Where:
T High is the high time.
T Hi- is the High reference crossing on the falling edge.
T Hi+ is the High reference crossing on the rising edge.
Measurement algorithms
MSO54, MSO56, MSO58, MSO58LP, MSO64 Help
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Summary of Contents for 6 series
Page 24: ...Product documents and support 4 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 42: ...Options 22 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 54: ...Install your instrument 34 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 84: ...Getting acquainted with your instrument 64 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 102: ...Configure the instrument 82 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 148: ...Advanced triggering 128 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 154: ...Zooming on waveforms 134 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 438: ...Waveform acquisition concepts 418 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 448: ...Waveform display concepts 428 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...
Page 518: ...Index 498 MSO54 MSO56 MSO58 MSO58LP MSO64 Help ...