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As an example of average mode usage, assume the Average # field is set to
16 and the Run mode is set to Repetitive. When you touch the Run field, the
oscilloscope starts acquiring waveform data and averaging it. After the
initial 16 waveforms are acquired, the oscilloscope momentarily displays the
advisory message "Number of averages has been met." Once the initial 16
waveforms are acquired, all new data is weighed at 1/N and is averaged with
the previous data. All data is retained.
If you set the Run mode to Single, acquisitions are not made until you touch
the Run field. If Average # is set to 16, as in the previous example, the
"Number of averages has been met" message will not be displayed until you
have touched the Run field 16 times.
If you bring a waveform that is being averaged in the oscilloscope into the
waveform display of another time correlated module, such as another
oscilloscope or a timing analyzer, the waveform will not continue to average.
Only the most recent acquisition, not the average trace data, will appear on
the screen. To view an averaged mode trace with other time correlated
waveforms, bring those other waveforms into the display of the oscilloscope
that is setup for average mode (only oscilloscope signals acquired by that
oscilloscope will be averaged on the display).
Panning or zooming an averaged waveform causes the waveform to redraw
with only the most recent acquisition on the display.
Accumulate Mode
In Accumulate mode, the oscilloscope accumulates all waveform
acquisitions and displays them on the screen without erasing the previously
acquired waveforms. This is similar to infinite persistence on an analog
storage oscilloscope. These acquisitions will stay on the display until Mode
is changed, or until the waveform is adjusted by a control that causes the
display to change, such as s/Div, Delay, or Connect Dots from On to Off.
When in Accumulate mode, the operation of the display grid follows special
rules when turned on or off (refer to the Grid Field paragraph later in this
chapter).
The waveforms that are generated in Accumulate mode cannot be stored to file
or printed directly; only the latest waveform will be saved or printed. If your
HP 16500 system has LAN capability, the accumulated waveforms can be
accessed by FTPing to the /system/graphics directory. The accumulated data is
in all of the three graphics files.
The Display Menu
Mode Field
7-5
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