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3 Features and Functions
DAQ970A/DAQ973A logic circuitry
As shown below the logic circuitry for the DAQ970A/DAQ973A is divided into two sections: earth-referenced and
floating. These two sections are isolated from each other in order to maintain measurement accuracy and
repeatability. See
Noise caused by ground loops
for further details on ground loops.
The earth-referenced and floating circuitry communicate with each other via an optically-isolated data link. The
earth-referenced section communicates with the floating section to provide PC connectivity. The
DAQ970A/DAQ973A is shipped with LAN and USB interfaces connectivity.
The earth-referenced section also provides four hardware alarm outputs and external trigger lines. You can use the
alarm output lines to trigger external alarm lights, sirens, or send a TTL-compatible pulse to your control system.
The floating section contains the main system processor and controls all of the basic functionality of the instrument.
This is where the instrument communicates with the plug-in modules, scans the keyboard, controls the front-panel
display, and controls the internal DMM. The floating sections also performs measurement scaling, monitors alarm
conditions, converts transducer measurements to engineering units, time stamps scanned measurements, and
saves data in non-volatile memory.
Keysight DAQ970A/DAQ973A User's Guide
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