Appendix E: Glossary
127
program by means of graphical screen
displays. GUIs can resemble the front
panels of instruments or other objects
associated with a computer program.
H
Handler
A device driver that is installed as part
of the operating system of the
computer.
Hardware
The physical components of a computer
system, such as the circuit boards,
plug-in boards, chassis, enclosures,
peripherals, cables, and so on.
I
IMD
Intermodulation Distortion: The ratio, in
dB, of the total rms signal level of
harmonic sum and difference distortion
products, to the overall rms signal level.
The test signal is two sine waves added
together according to the following
standards:
INL
Integral Non-linearity: A measure in LSB
of the worst-case deviation from the
ideal A/D or D/A transfer characteristic
of the analog I/O circuitry.
Input Bias Current
The current that flows into the inputs
of a circuit.
Input Impedance
The measured resistance and
capacitance between the input
terminals of a circuit.
Input Offset Current
The difference in the input bias
currents of the two inputs of an
instrumentation amplifier.
Instrumentation Amplifier
A circuit whose output voltage with
respect to ground is proportional to the
difference between the voltages at its
two inputs.
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