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PCI-4451/4452 User Manual G-12
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National Instruments Corporation
M
m meters
M (1) Mega, the standard metric prefix for 1 million or 10
6
, when used with
units of measure such as volts and hertz; (2) mega, the prefix for 1,048,576,
or 2
20
, when used with B to quantify data or computer memory
Mbytes/s a unit for data transfer that means 1,048,576 bytes/s
memory buffer See buffer.
MITE MXI Interface to Everything—a custom ASIC designed by National
Instruments that implements the PCI bus interface. The MITE supports bus
mastering for high-speed data transfers over the PCI bus.
MS million samples
MSB most significant bit
MTBF mean time between failure
MTTR mean time to repair—predicts downtime and how long it takes to fix a
product
N
NC normally closed, or not connected
NI-DAQ National Instruments driver software for DAQ hardware
NIST National Institute of Standards and Technology
noise an undesirable electrical signal—Noise comes from external sources such
as the AC power line, motors, generators, transformers, fluorescent lights,
soldering irons, CRT displays, computers, electrical storms, welders, radio
transmitters, and internal sources such as semiconductors, resistors, and
capacitors. Noise corrupts signals you are trying to send or receive.
nonlatched digital I/O a type of digital acquisition/generation where LabVIEW updates the digital
lines or port states immediately or returns the digital value of an input line.
Also called immediate digital I/O or non-handshaking.
User.book Page 12 Tuesday, April 14, 1998 10:20 AM