Other variables. The instrument also measures several values itself that it uses to help calculate measurements.
Record Length. is the number of data points in the time base. You set it with the Horizontal menu Record Length item.
Start. is the location of the start of the measurement zone (X-value). It is 0.0 samples unless you are making a gated
measurement. When you use gated measurements, it is the location of the left vertical cursor.
End. is the location of the end of the measurement zone (X-value). It is (RecordLength – 1.0) samples unless you are making a
gated measurement. When you use gated measurements, it is the location of the right vertical cursor.
Hysteresis. is the hysteresis band 10% of the waveform amplitude. It is used in MCross1, MCross2, and MCross3 calculations.
For example, once a crossing has been measured in a negative direction, the waveform data must fall below 10% of the
amplitude from the MidRef point before the measurement system is armed and ready for a positive crossing. Similarly, after a
positive MidRef crossing, waveform data must go above 10% of the amplitude before a negative crossing can be measured.
Hysteresis is useful when you are measuring noisy signals, because it allows the oscilloscope to ignore minor fluctuations in the
signal.
Oscilloscope reference
688 DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series
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