National Instruments Measure Data Acquisition User Manual page 90

output limits
PGIA
postriggering
pretriggering
Range
RMS
RSE
scan
scan clock
scan rate
scan width
The upper and lower voltage or current outputs for an analog
output channel. The output limits determine the polarity and
voltage reference settings for a board.
Programmable gain instrumentation amplifier.
The technique you use on a data acquisition board to acquire a
programmed number of samples after trigger conditions are met.
The technique you use on a data acquisition board to keep a
continuous buffer filled with data, so that when the trigger
conditions are met, the sample includes the data leading up to
the trigger condition.
A group of rows and columns on a spreadsheet.
Root mean square.
Referenced single-ended.
One reading from each channel or port in an analog or digital
input group.
The clock controlling the time interval between scans. On
boards with interval scanning support (for example, the
AT-MIO-16F-5), this clock gates the channel clock on and off.
On boards with simultaneous sampling (for example, the
EISA-A2000), this clock clocks the track-and-hold circuitry.
The number of scans per second. For example, at a scan rate of
10Hz, Measure samples each channel in a group 10 times per
second.
The number of channels in the channel list or number of ports in
the port list you use to configure an analog or digital input
group.