This instrument is a mains operated, high performance autoranging multimeter providing 5½ digit resolution (± 210000 counts) switchable to 4½ digits (± 21000 counts) for a higher reading rate. It has a 7-segment l.e.d. display coupled with l.e.d. annunciators for displayed units and instrument status. The main features are :- • ARC serial interface as standard, GPIB optional • True RMS AC measurements • Four-terminal Ohms • Selectable audible continuity checker • T/Hold mode - holds onto a stable reading until updated • Display nulling - a different value can be set up for each function • 100 point data logger - circular or linear store • Measurement post-processing:- percentage deviation from a user-entered reference decibel calculations linear scaling with offset limits comparison for go/no go testing automatic storage of minimum and maximum readings • Selectable digital filter • Programmable buzzer • Battery-backed RAM :- storage of six instrument set-ups automatic power up with last used settings. retention of user entered references and scaling factors retention of logged data • Software calibration with constants stored in EEPROM