Omega OMB-DAQBOARD-3000 Series User Manual page 105

Glossary
Acquisition A collection of scans acquired at a specified rate as controlled by the sequencer.
Analog A signal of varying voltage or current that communicates data.
Analog-to-Digital A circuit or device that converts analog values into digital values, such as binary bits, for use in
Converter (ADC)
API Application Program Interface. The interface program within the Daq system's driver that
Bipolar A range of analog signals with positive and negative values (e.g., -5 to +5 V); see unipolar.
Buffer Buffer refers to a circuit or device that allows a signal to pass through it, while providing
(a) A device or circuit that allows for the temporary storage of data during data transfers.
(b) A follower stage used to drive a number of gates without overloading the preceding stage.
(c)
Buffer Amplifier An amplifier used primarily to match two different impedance points, and isolate one stage from
Channel In reference to Daq devices, channel simply refers to a single input, or output entity.
In a broader sense, an input channel is a signal path between the transducer at the point of
An output channel from a device can be digital or analog. Outputs can vary in a programmed
Common mode Common mode pertains to signals that are identical in amplitude and duration; also can be used
Common mode Common mode voltage refers to a voltage magnitude (referenced to a common point) that is
voltage
Crosstalk An undesired transfer of signals between systems or system components. Crosstalk causes
Digital A digital signal is one of discrete value, in contrast to a varying signal. Combinations of binary
Digital-to-Analog A circuit or device that converts digital values (binary bits), into analog signals.
Converter (DAC)
DIP switch A DIP switch is a group of miniature switches in a small Dual In-line Package (DIP). Typically,
Differential mode The differential mode measures a voltage between 2 signal lines for a single channel. (Also see
Glossary
digital computer processing.
includes function calls specific to Daq hardware and can be used with user-written programs
(several languages supported).
isolation, or another function, without altering the signal. Buffer usually refers to:
Such storage can compensate for differences in data flow rates. In a FIFO (First In - First
Out) buffer, the data that is stored first is also the first data to leave the buffer.
An amplifier which accepts high source impedance input and results in low source
impedance output (effectively, an impedance buffer).
a succeeding stage in order to prevent an undesirable interaction between the two stages.
(Also see, Buffer).
measurement and the data acquisition system. A channel can go through various stages
(buffers, multiplexers, or signal conditioning amplifiers and filters). Input channels are
periodically sampled for readings.
way in response to an input channel signal.
in reference to signal components.
shared by two or more signals. Example: referenced to common, Signal 1 is +5 VDC and
Signal 2 is +6 VDC. The common mode voltage for the two signals is +5.5 VDC [(5 + 6)/2].
signal interference, more commonly referred to as noise.
digits (0s and 1s) represent digital data.
users set these switches to configure their particular application.
single-ended mode).
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