The Fluke Model 57LFC System Calibrator (hereafter called the Calibrator) is a precise instrument that calibrates a wide variety of electrical measuring instruments. This calibrator maintains a high accuracy over a wide ambient temperature range, and is able to test instruments in harsh environments, eliminating the restriction of calibrating only in a temperature-controlled standards laboratory. With a 57LFC, you can calibrate precision multimeters that measure ac or dc voltage, ac or dc current, and resistance. The Calibrator operates in a similar manner to the 57XXA series calibrators. Specifications are provided at the end of this chapter. The Calibrator is a fullyprogrammable precision source of the following: • DC voltage to 220 V. • AC voltage to 220 V rms, with output available from 10 Hz to 100 kHz. • AC and DC current to 2.2 A, with AC output available from 10 Hz to 20 kHz. • Resistance in values from 0 Ω to 19 MΩ in 1 and 1.9x. Features of the calibrator include the following: • Automatic meter error calculation obtained through using a simple remote adjust. • Programmable entry limits used for restricting the levels that can be remotely keyed into the calibrator, preventing access to levels that may be harmful to equipment or personnel. • Real-time clock and calendar. • Offset and scaling modes that simplify linearity testing of multimeters. • Standard IEEE-488 (GPIB) interface, complying with ANSI/IEEE Standards 488.1- 1987 and 488.2-1987. • Internal self-testing and diagnostics of analog and digital functions. • Status LEDs on front panel to indicate standby (yellow), operate (green), high voltage (red), and fault (red and yellow).