AcqKnowledge software allows users to rescale any analog signal being acquired. Instead of simply measuring voltage, input signals can be scaled and renamed to more meaningful units. The rescaling function can also be used to calibrate a force transducer or similar device so that the recorded data matches the physical measurement of the transducer—the only requirement is that the data being acquired is an analog signal. Analog channels are the most common type of acquired channel and should be used to acquire any data with continuous values. The range of input values for analog channels using the MP150 is ±10 Volts.
There are various applications and uses for calibrating and rescaling different signals. A general knowledge of the three applications listed below will help address and hopefully solve any problems you might run into.
accurate signal measurement (reversing the amplified gain setting)
Note: The calibration and signal rescaling procedures detailed in this application note are intended for AcqKnowledge 4.0 and earlier; for AcqKnowledge 4.1 and higher, it’s recommended to use the MP150 > Set Up Channels > Add New Module feature, which automatically scales the signal based on the selected transducer or hardware. If additional scaling modifications are desired, they may be manually applied via the “View by Channels > Setup” option.
Learn a technique—Trans-radial Electrical Bioimpedance Velocimetry (TREV)—that is more user-friendly and less invasive than the transthoracic method. TREV measures blood movement in the radial and ulnar arteries of the forearm via bioimpedance.
– Presentation and discussion of TREV
– Derived Indices Relevant to TREV
– Hardware setup
– Participant setup
– Recognizing good quality and bad quality data
– Demonstration with the grip anticipation test
– Review of results from other tests
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