LBL Magnetic-Measurements Data-Acquisition System

A real time data acquisition system (DAS) for magnetic measurements was developed. The design objective was for a system that was versatile, portable, modular, expandable, quickly and easily reconfigurable both in hardware and software, and inexpensive. All objectives except the last were attained. An LSI 11/23 microcomputer is interfaced to a clock calendar, printer, CRT control terminal, plotter with hard copy, floppy and hard disks, GPIB, and CAMAC buses. Off the shelf hardware and software were used where possible. Operational capabilities include: (1) measurement of high permeability materials; (2) harmonic error analysis of superconducting dipoles and rare earth cobalt and conventional quadrupole magnets; and (3) 0.1% accuracy x-y mapping with Hall probes. Results are typically presented in both tabular and graphical form during measurements.