Free New Application Note Teaches Users How to Overcome Data Acquisition
Inaccuracies Caused by Settling Time

Determining Instrumentation Amplifier Settling Time Key to Successful Data
Acquisition Applications

December 17, 1993 - Austin, TX - The new National Instruments application
note, "Is Your Data Inaccurate Because of Instrumentation Amplifier
Settling Time?" informs readers of inaccuracies caused by settling time
problems with data acquisition (DAQ) products and teaches users how to
overcome them.

Many system developers use a plug-in DAQ board with a high-resolution ADC
that scans several input channels with a high sampling rate. These users
may be unknowingly obtaining inaccurate data because the instrumentation
amplifier does not settle. The application note explains how users can
test DAQ boards to determine the DC and AC settling time of the
instrumentation amplifier; discusses how gain, multiplexing, source output
impedance, and transmission line resistance and capacitance affect
settling time; and describes two ways users can reduce the effects of
settling time.

The application note defines settling time as the amount of time required
for a signal to reach a certain accuracy and stay within a specified
range. The instrumentation amplifier must settle before the A/D conversion
takes place or the incoming data will be inaccurate, because the voltage
digitized will be higher or lower than the actual voltage that the user
attempted to acquire.

To request a free copy of "Is Your Data Inaccurate Because of
Instrumentation Amplifier Settling Time?" (part number 340553-01), or for
more information, please contact National Instruments at 6504 Bridge Point
Parkway, Austin, TX 78730-5039, (512) 794-0100. Or, call toll free in the
U.S. and Canada: (800) 433-3488. Fax: (512) 794-8411.

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