Glossary
© National Instruments Corporation G-7 NI 660x User Manual
ppb parts per billion
prescaling The division of frequency of an input signal that is to be used as SOURCE
of a counter.
programmed I/O A data transfer method in which the CPU reads or writes data as prompted
by software.
PXI Modular instrumentation standard based on CompactPCI developed by
National Instruments with enhancements for instrumentation.
R
reflection A high-speed signal transition behaves like a wave and is reflected like a
wave at an inadequately terminated endpoint. This phenomenon is referred
to as reflection.
RG reserved ground. Pins that are marked RG on the I/O connector are
no-connects if you use the SH100-100-S2 shielded cable, while they are
ground pins if you use the R100100 unshielded ribbon cable.
ribbon cable A flat cable in which the conductors are side by side.
ringing The oscillation of a signal about a high-voltage or low-voltage state
immediately following a transition to that state.
RTSI Bus real-time system integration bus—the National Instruments timing bus that
connects DAQ boards directly, by means of connectors on top of the boards,
for precise synchronization of functions.
S
s seconds
(HW) Save register A register inside the NI-TIO ASIC that stores the result of a measurement.
source In the counter context, source refers to the signal that causes the counter to
increment or decrement. In the context of signals, source refers to the
device that drives a signal.
SOURCE The signal that causes the counter to increment or decrement.
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