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 is shipped with LAN and USBinterfaces 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, con-
trols the front-panel display, and controls the internal DMM. The floating sections also performs meas-
urement scaling, monitors alarm conditions, converts transducer measurements to engineering units, time
stamps scanned measurements, and saves data in non-volatile memory.
Plug-in modules
The DAQ970A offers a complete selection of plug-in modules to give you high-quality measurement, switch-
ing, and control capabilities. The plug-in modules communicate with the floating logic via the internal isol-
ated digital bus. The multiplexer modules also connect to the internal DMMvia the internal analog bus.
Each modules has its own microprocessor to offload the mainframe processor and minimize backplane
communications for faster throughput. See Module Overview for more information.
Module number Common uses
Measurement input
DAQM900A Scanning and direct measurement of temperature, voltage, resistance, frequency, and current
(DAQM901A only) by using the internal DMM.
DAQM901A
DAQM902A
DAQM907A Digital Input, Event Counting.
DAQM908A Scanning and direct measurement of temperature, voltage, and resistance by using the internal DMM.
Signal routing
3 Features and Functions
54 Keysight DAQ970A User's Guide
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