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effectively unattenuated up to 150 Hz, and is
0.707 of the original value at 200 Hz.
front-end. An ancillary device that extends
PowerLab capabilities, providing additional
signal conditioning and features for
specialised work. Front-ends are recognised
automatically by the PowerLab system and
seamlessly integrated into its applications,
operating under full software control.
gain. The amount of amplification of a signal.
half-bridge transducer. A bridge transducer
only using half of the full-bridge circuit. It
consists of two elements of equal value with
an excitation voltage applied across them.
The output of the transducer is taken at the
junction of the two elements.
hertz (Hz). The unit of frequency of vibration
or oscillation, defined as the number of cycles
per second. The PowerLab's maximum
sampling rate can be up to 100 kHz for /20
series and 200 kHz for
high-pass filter (HPF). A filter that passes
high-frequency signals, but filters low ones,
by blocking DC voltages and attenuating
frequencies below a certain value (the cutoff,
or –3 dB, frequency).
2
2
I
C. The I
C (eye-squared-sea) connection is
used by the PowerLab to control front-ends.
It provides power and communications using
a 4-wire serial bus (two wires for standard
2
I
C and two control lines).
IEC. International Electrotechnical Commission.
low-pass filter (LPF). A filter that passes low-
frequency signals and DC voltages, but filters
Glossary
and
PowerLabs.
SP
ST
high ones, attenuating frequencies above a
certain value (the cutoff, or –3 dB, frequency).
Macintosh. A family of Apple computers
with built-in graphics and an elegant user
interface. A Power Macintosh and Mac OS 8.5
or later are needed to use USB, and thus
needed to use the /20 series PowerLabs.
MacLab. An earlier name for the PowerLab,
before it became cross-platform.
Peaks. An early, simple chromatography
analysis package. It reads acquired data from
Macintosh Chart, Scope, or text files.
(Available for Macintosh only.)
PCI (peripheral component interconnect). A
protocol for connecting peripheral devices
(such as USB cards) to computers and so on.
Pod connector. A special 8-pin DIN connector
on some PowerLabs giving differential or
single-sided connections for some analog
inputs (Inputs 1 and 2 on the PowerLab 2/20
and PowerLab 4/20). Pods can connect to
them, and they can also provide power and
control for some types of transducers.
Pods. Small, low-cost units that connect to
the PowerLab's pod connectors. They give
alternatives to front-ends for specific tasks,
for use with precalibrated transducers etc.
port. A socket in a computer where you plug
in a cable for connection to a network or a
peripheral device. Also, any connection for
transferring data, for instance between the
CPU and main memory.
PowerChrom. A versatile, flexible, and
powerful chromatography program for use
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