Glossary
GLOSSARY
A
Acquisition
Acquisition or data acquisition (DAQ) is the act or process of gaining digital data through (analogue-to-digital)
conversion of a physical signal to measure an electrical or physical signal, such as voltage, current, tem-
perature, pressure, or sound. A DAQ system consists of sensors, DAQ measurement hardware, and a com-
puter with programmable software. The system is ready and waiting for a trigger.
Aliasing
An alias is a trace that does not represent the signal because the measured values are too few. Aliasing is an
error in digital sampling in which two frequencies cannot be distinguished that is caused by sampling at less
than twice the maximum frequency in the signal. HBK recommends assigning a sample rate about ten times
the maximum frequency that you want to measure, for example, for a 50 Hz signal to measure with 300 S/s or
600 S/s.
Anti-aliasing Filter
A filter used before a signal sampler to restrict the bandwidth of a signal. Used in audio applications.
Averaging
Averaging is used to control the noise in the signal in order to identify the stationary frequencies that are oth-
erwise hidden in the noise band.
B
Bessel Filter
A filter characteristic that is commonly found in measurement applications. The Bessel characteristic has a very
good time response and an optimal square-wave and impulse response. Therefore, this filter type is recom-
mended for signals with very steep edges and for rather static processes below 10 Hz.
BKC
The .bkc (BK Common) file format is an HBK format that saves data (time and function) with metadata and is
an effective format to use when sharing data.
Board
Hardware that can condition signals, busses or actuators and convert the signal between the Ethernet/PCIe
backplane and the sensor, bus or actuator (bridge inputs, CCLD, voltage in/out, temperature, CAN/CAN-FD,
etc.). The board must be used with the frame, and can easily slide into and out of the frame
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