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Acquisition System
When you select "Average" mode, click or tap the Averages input field to set it with
the pop-up numeric keypad or use the corresponding multipurpose knob to set the
value. Its range is from 2 (default) to 65536.
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The number of averages must be the Nth power of 2. When it is not in N power-of-2
increments, a prompt message "Truncation average error" is displayed. At this time, a value
that is smaller than the one you input and the closest to N power-of-2 increments will be input
automatically.
Peak
In this mode, the oscilloscope acquires the maximum and minimum values of the
signal within the acquisition interval to get the signal envelope or capture narrow
pulses that might be lost. This mode prevents signal aliasing at the expense of
exaggerating the noise.
In this mode, the minimum pulse width detected is the sample period.
High Resolution
This mode uses a kind of ultra-sample technique to average sequential sample points
to reduce the random noise on the input signal and generate much smoother
waveforms on the screen. This is generally used when the sample rate of the digitizer
is higher than the storage rate in acquisition memory.
When you select "High Res" mode, click or tap the bits drop-down button to select
14 (default) or 16. The bandwidth of the selected bit is displayed behind the box.
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The averaging modes of the "Average" and "High Res" are different. The former uses
"Multi-sample Average" and the latter uses "Single Sample Average".
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In "High Res" mode, the oscilloscope improves the measurement accuracy at the cost of
bandwidth. Each time the sample rate changes, the current bandwidth is indicated at the
right side of bits in the menu.
UltraAcquire
UltraAcquire mode is one of the fast acquisition modes. It divides the oscilloscope's
memory into segments and fills a memory segment for each individual trigger event.
It proivides a much higher waveform capture rate and helps minimize the dead time
between trigger events.
When you select "UltraAcquire" mode, click or tap Max Frames input field to set the
maximum number of frames and Timeout input field to set the timeout. When the
number of the frames reaches the maximum or the sampling time reaches the
timeout, the oscilloscope stops sampling and plots the waveform. Click or tap the
Display mode drop-down button to select the display mode of the acquired data.
HDO4000 User Guide
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