9-4
IM 701830-01E
9.2
Automatic Measurement of Waveform
Parameters
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For a description of this function, refer to page 1-19.
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Function
You use this function to generate automatic measurements of waveform characteristics based on
data in the acquisition memory.
Restrictions
Automatic measurement cannot be used with the following waveform types.
• Snapshot waveforms
• Accumulated waveforms (except for most recent waveform)
• A waveform that is not being triggered.
• Logic waveforms
Selection of High/Low method (High/Low Mode)
The “High” value is the 100% voltage level used in measurements of rise time, fall times, and
other such parameters. The “Low” value is the 0% level. You can select one of two methods for
setting the High and Low levels.
• Auto
The instrument automatically sets the voltage level at high amplitude to “High,” and the level
at low amplitude to “Low.” It does this by detecting reoccurring voltage levels within the
measurement area, while taking into account the occurrence of spikes and ringing. This
method is best when working with square waves and pulse waves.
• Max-Min
The maximum voltage level within the measurement area is taken as “High,” and the
minimum level is taken as “Low.” This method is best for measuring sine waves and
sawtooth waves, but is not appropriate for waves that include spikes, ringing, or other such
phenomena.
Distal, mesial, and proximal settings (Distal/Prox Mode)
The distal, mesial, and proximal levels serve as reference points for measurements of rise time,
fall time, and other such parameters. You can select any of three methods for setting these
values.
• Auto
Sets distal to 90% level, mesial to 50% level, and proximal to 10% level, relative to 100% at
High and 0% at Low.
• Manual
Lets you set arbitrary levels for distal, mesial, and proximal levels. Settings are in percent,
relative to 100% at High and 0% at Low.
• Unit
Lets you set the distal, mesial, and proximal values for any trace (CH1 to CH16, Math1 to
Math8) to arbitrary voltage values or temperature.
Delay reference (Delay Ref)
The “delay reference” is used as the starting point for measuring delay time. Select one of the
following.
Trig
: Trigger point
CH1, ..., CH16 : Center (mesial) point of the first rise or fall (within the measurement area) of
the waveform on the selected channel.
When “Delay Ref” is set to CH1 to CH16, the Delay Ref line becomes the measurement start
line of the delay reference waveform.
The maximum number of channels that can be selected for “Delay Ref” is 11 channels from the
lowest channel.
Selecting the slope for the starting point of delay
When CH1 to CH8 is selected for the Delay Ref, the starting point of the delay measurement
can be selected on what condition the signal passes the mesial point.
: Center (mesial) point of the first rise of the waveform
: Center (mesial) point of the first fall of the waveform
: Center (mesial) point of the first rise or fall of the waveform
