Measurement errors
The following measurement errors can be generated by the instrument. They may be generated in various situations such as
those described below. In general, measurements producing an error will produce nothing.
Error Description
Unstable These are generic error messages that occur when the measurement system was unable to obtain
a correct measurement
Measurement system error
Zero period These occur when the measurement system was unable to correctly measure the period of a
waveform
No period found
No period 2nd waveform
Low signal amplitude These occur when the measurement system was unable to correctly measure the signal amplitude
of a waveform
Low amplitude 2nd wfm
Invalid gate This error can occur if measurement gating was turned on and gated a measurement to a region
that was insufficient to complete a measurement
Waveform does not close ref These errors can occur when the measurement system cannot correctly find edge crossings for
the specified edge crossing and waveform
No second ref crossing
No ref cross 2nd wfm
No backwards ref cross
Wfm does not cross Ref
No ref cross 2nd wfm
No ref cros 1st wfm
Constant waveform This can be generated from various timing based measurements on flat waveforms
No valid edge This can occur when the measurement package was unable to extract a valid edge crossing in
some timing measurements
Cursor types
Because cursor measurements give immediate feedback on the amplitude or time values they measure, they are usually quick to
take and are more accurate than graticule measurements. Also, since you can position cursors wherever you want them on the
waveform, they are easier to localize to a waveform segment or feature than automatic measurements.
The following table defines the cursor types.
Oscilloscope reference
700 DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series
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