Glossary
Measure Data Acquisition User Manual
G-6
© National Instruments Corporation
output limits
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.
P
PGIA
Programmable gain instrumentation amplifier.
postriggering
The technique you use on a data acquisition board to acquire a
programmed number of samples after trigger conditions are met.
pretriggering
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.
R
Range
A group of rows and columns on a spreadsheet.
RMS
Root mean square.
RSE
Referenced single-ended.
S
scan
One reading from each channel or port in an analog or digital
input group.
scan clock
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.
scan rate
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.
scan width
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.
