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Glossary
© National Instruments Corporation
G-3
DC
direct current
DDS
direct digital synthesis—a method of creating a clock with a programmable
frequency.
frequency.
E
EEPROM
electrically erasable programmable read-only memory—ROM that can be
erased with an electrical signal and reprogrammed.
erased with an electrical signal and reprogrammed.
ESD
electrostatic discharge
F
frequency
The basic unit of rate, measured in events or oscillations per second using
a frequency counter or spectrum analyzer. Frequency is the reciprocal of
the period of a signal.
a frequency counter or spectrum analyzer. Frequency is the reciprocal of
the period of a signal.
frequency tuning word
A number that specifies the frequency.
front panel
The physical front panel of an instrument or other hardware .
H
Hz
hertz—the number of scans read or updates written per second.
I
in.
inch or inches
J
jitter
The rapid variation of a clock or sampling frequency from an ideal constant
frequency.
frequency.