Appendix A — Glossary
21
PowerChrom unit
. The PowerChrom unit is a
self-contained data acquisition hardware unit
that connects to a Windows or Macintosh
computer.
range
. In PowerChrom, the range is the
maximum positive and negative voltage that
can be displayed, from ±2 mV to ±10 V, in
twelve steps. (Range is inversely proportional
to gain, the amount of amplification.)
terminator
. A device used in a SCSI chain to
maintain signal integrity. Some devices, such
as internal hard disks, have them built in.
TTL
(transistor-transistor logic). A family of
integrated circuits with bipolar circuit logic:
TTLs are used in computers and related
devices. TTL is also a standard for
interconnecting such circuits, which defines the
voltages used to represent logical zeroes and
ones (binary 0 and 1).
USB
(Universal Serial Bus). A serial
communication standard used for connecting
peripheral devices to computers supporting the
standard.
waveform
. The shape of a wave (a graph of a
wave’s amplitude over time).
