Data Acquisition Unit Mainframe without built-in 6 1/2 digit Multimeter (Option 001) The Agilent (now Keysight) 34970A Data Acquisition / Data Logger Switch Unit consists of a three-slot mainframe with a built-in 6 1/2 digit Multimeter. (This unit has option 001 and is without built-in 61/2 digit multimeter). Each channel can be configured independently to measure one of 11 different functions without the added cost of signal-conditioning accessories. There are eight optional plug-in modules to create a compact data logger, full-featured data acquisition system or low-cost switching unit. On-module screw-terminal connections eliminate the need for terminal blocks and a unique relay maintenance feature counts every closure on every switch for easy, predictable relay maintenance. 3-slot mainframe with built-in GPIB and RS232 interfaces 6 1/2-digit (22-bit) internal DMM, scanning up to 250 channels per second 8 switch and control plug-in modules to choose from Built-in signal conditioning measures thermocouples, RTDs and thermistors, ac/dc volts and current; resistance; frequency and period Voltage measurement AC/DC: 100 mV to 300 V Resistance measurement: 100 ohms to 100 Mohms Frequency measurement: 3 Hz to 300 kHz Temperature: -210°C to +1820°C 50k readings of non-volatile memory holds data when power is removed Hi/LO alarm limits on each channel, plus 4 TTL alarm outputs Low noise