Keysight DAQ970A Guia Del Usuario página 221

Measurement Fundamentals
This section explains how the DAQ970A/DAQ973A makes measurements and discusses the most common sources
of error related to these measurements.
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The internal DMM
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Temperature measurements
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DC voltage measurements
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AC voltage measurements
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Current measurements
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Resistance measurement
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Strain gage measurements
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Frequency and period measurements
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Capacitance measurements
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Digitizing measurements
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Level triggering
The internal DMM
The internal DMM provides a universal input front-end for measuring a variety of transducer types without the need
for additional external signal conditioning. The internal DMM includes signal conditioning, amplification (or
attenuation), and a high resolution (up to 22 bits) analog-to-digital converter. A simplified diagram of the internal
DMM is shown below.
The internal DMM can directly make the following types of measurements. Each of these measurements is described
in the following sections of this chapter:
– Temperature (thermocouple, 2-wire and 4-wire RTD, 2-wire and 4-wire thermistor)
– Voltage (DC and AC up to 300 V)
– Resistance (2-wire and 4-wire up to 1 GΩ)
– Current (DC and AC up to 1 A)
– Frequency and Period (up to 300 kHz)
– Strain (bridge and direct methods)
Keysight DAQ970A/DAQ973A User's Guide
4 Measurement Tutorials
221