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This covers terms used in this owner's guide,
those for ADInstruments front-ends, and the
user's guides for ADInstruments software.
General and specific computer terminology
should be covered in the material that came
with your computer, or in a recent dictionary.
AC coupling. A filter option. When AC
coupling is chosen, a 0.1 Hz high-pass filter
before the first amplification stage removes
DC and frequency components below 0.1 Hz.
This removes slowly changing baselines.
ADC (analog-to-digital converter). A device
that converts analog information into some
corresponding digital voltage or current.
amplitude. The maximum vertical distance of
a periodic wave from the zero or mean
position about which the wave oscillates.
analog. Varying smoothly and continuously
over a range. An analog signal varies
continuously over time, rather than changing
in discrete steps.
analog input. This refers to the connectors on
the front of the PowerLab marked 'Input'.
These inputs are designed to accept up to ±10
PowerLab Owner's Guide
Glossary
volts. Inputs can be either single-sided or
differential (the latter only in the case of the
pod connectors).
analog output. This refers to the connectors
on the front of the PowerLab marked
'Output'. The analog output provides a
software-controlled variable output (±10 V)
that can be used with applications either
directly as a stimulator, or to control
peripheral devices.
analysis. When the PowerLab is not
physically connected to the computer, then
ADInstruments software can be used to
analyse and manipulate existing files if the
analysis option is chosen.
BNC (bayonet nut connector). A sort of cable
or connector; a BNC-to-BNC cable connects
two BNC connectors.
bridge transducer. A type of transducer using
a Wheatstone bridge circuit. In its basic form,
the bridge consists of four two-terminal
elements (usually strain gauges) connected to
form a quadrilateral. An excitation source is
connected across one diagonal, and the
transducer output is taken across the other.
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