34970 A Data Acquisition

The Agilent 34970A is a data acquisition and switch unit that combines precision measurement with flexible signal routing. The instrument includes an internal 6.5-digit digital multimeter as its measurement engine. Three module slots are built into the rear of the instrument to accept any combination of data acquisition or switching modules. The 34970A is designed for both data logging and automated test system applications.^{[4][3][2][1][5][6]}

The 34970A uses an internal autoranging DMM to directly measure eleven different input signals, including temperature with thermocouples, RTDs, and thermistors, as well as DC and AC volts, resistance, frequency, period, and DC and AC current. Three module slots in the rear accept plug-in modules such as multiplexers, matrix switches, actuator relays, RF switches, and multifunction modules that provide digital I/O, totalizer, and analog output functions. Each input channel is independently configurable for measurement function, Mx+B scaling, and alarm limits. The instrument provides GPIB (IEEE-488) and RS-232 interfaces as standard for remote control and data transfer, and it is SCPI compatible for programmable operation. A front-panel interface with a knob and navigation keys allows channel selection, menu navigation, and data entry.^[2][1][5]

The 34970A is applied in temperature measurement using thermocouples, RTDs, and thermistors, as well as voltage, current, resistance, frequency, and period measurements. Typical data logging applications include environmental chamber monitoring, component inspection, benchtop testing, process troubleshooting, and temperature profiling. In automated test applications, the instrument provides the measurement backbone for ATE systems, offering 6.5-digit resolution and per-channel configurability. The instrument also finds use in switching applications where it routes signals between devices and instruments using its plug-in switch modules.^[2][1][5]