Page 4 of 15 AcqKnowledge
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During recording (or playback of data); note when the data plot
reaches the right edge of the window, the waveforms begin
continuously scrolling from right to left. For long recordings, it
may be desirable to view the data collected earlier in the
acquisition while new data is coming in.
To demonstrate this, disable the AutoPlotting and Scrolling
options on the Playback menu by unchecking the boxes.
Replay the acquisition again.
Now, when the data plot reaches the right limit, the screen will not
be re-written, but the horizontal scroll bar will shift to indicate that
the file length is longer than the visible display.
At this point, you can use the horizontal scroll bar to look back
through the data. Note that the scroll bar position indicator is
changing while data collection is in progress. This indicates that
the record is getting longer as new data is being acquired. You can
reselect AutoPlotting to again view the new data as it is acquired,
and Scrolling as desired.
During long recordings, you may wish to do other tasks on the
computer. By minimizing or resizing the window, the MP System
can be busy collecting data in the background while you're using another program. The MP System software will
never miss any data.
In addition to the ability to collect data in the background, AcqKnowledge also gives you total control over the
channel acquisition parameters. To illustrate this, choose Set Up Data Acquisition > Channels from the Playback
menu. To the left of each channel, the Acquire checkbox enables acquisition, and the Plot checkbox enables plotting.
If Acquire is on but Plot is off, data from that channel will be recorded, but not plotted on the screen. After the data is
recorded, you can turn the channel plotting on by pressing the Option (Mac) or Alt (PC) key and clicking in the
channel boxes at the upper left of the graph window.
The Values checkbox will cause the channel’s current value to be numerically displayed in the Input Values window.
When a channel row is selected, you can set scaling and other parameters. You can edit each channel Label as
desired.
Calculation Channel Presets offer an easy way to apply filters, expressions or
transformations to data in real time. Click the Calculations tab in the Set Up
Channels dialog to activate the Presets menu. Click the (arrow icon) to
generate a list of preset options. Use an existing preset, or modify it to create a new
one. Then, organize the channel presets (via the Playback menu) to suit your needs.
Calculation Presets can only work in conjunction with Analog input presets, or with
other calculation channels that are ultimately pointing to an Analog source channel.
Use Playback menu > Set Up Data Acquisition > Channels > Setup to set the
Source for a Calculation channel.
You can easily translate the voltage read by the MP hardware into the units of the
device being measured. Click the Analog tab in the Set Up Channels dialog and click
the Setup button to generate the Scaling dialog. Enter values and a units label to
convert incoming signals into other units (such as ft/lbs,
millimeters, liters, etc.).