Keysight InfiniiVision HD3 Series - The Analysis Record and Waveform Math

Math Waveforms 5
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 95
Use the Measurement drop-down list to select the previously added measurement
whose trend you want to look at. You can display trend values for these
measurements:
• Average
• RMS - AC
• Ratio
• Period
• Frequency
• +Width
• -Width
• +Duty Cycle
• -Duty Cycle
• Rise Time
• Fall Time
Select Thresholds... to open the Measurement Thresholds dialog box where you can
set up measurement thresholds for analog channels, math functions, and
reference waveforms.
If a measurement cannot be made for part of a waveform, the trend function
output is a hole (that is, no value) until a measurement can be made.
The Analysis Record and Waveform Math
Keysight InfiniiVision oscilloscopes are designed to provide high waveform update
rates which give you an increased probability of capturing infrequent events. With
high waveform update rates, there is less "dead time" between acquisitions.
To provide high waveform update rates, there are some things the oscilloscope
does with memory:
• When running, acquisition memory is split into two memories so that the
processing of one acquisition can take place while another acquisition is being
captured. For single acquisitions, the full memory is used. Waveform data in
acquisition memory is called the raw acquisition record.
• There is a separate eavesdrop memory used for making measurements and for
calculating math functions. Data in this memory is a reduced-sample
decimation of the data in the raw acquisition record. Waveform data in
eavesdrop memory is called the analysis record.
The default length of the analysis record is 64K points. To improve the precision
of measurements and math functions (including FFT), at the expense of
waveform update rate, you can also select deeper analysis record lengths.