The Model 171 AC/DC Digital Multimeter is a highly versatile 4-1/2 digit instrument capable oi handling virtually every measurement that will ever be encountered in most lab or production-line facilities. The 171 measures 1 microvolt to 1000 volts dc, 10 microvolts to 1000 volts ac, 100 picoamperes to 2 amperes ac and dc, and 100 milliohms to 2000 megohms. Thirty of the thirty-two total ranges of the Model 171 are capable of 100% overranging, the two exceptions being the highest voltage ranges. This allows the user to accurately exceed a full-scale reading without having to immediately change range. The overrange "X" digit of the 171 DMM essentially gives 5-digit precision to a reading. To prevent reading errors when beyond the allowable overrange capability (19999) of the 171, the last four digits of the display will blank. The Model 171 provides better than 70 dB rejection of line frequency noise that may be superimposed on a dc input signal while maintaining leas than 2 seconds settling time. FEATURES. a. Direct-Reading Display. The decimal point and engineering units of a reading are automatically shown b. Thirty-two Ranges. The 171 provides six ranges of dc voltage, five ranges of ac voltage, and seven ranges each of dc and ac current and resistance. c. High NMRR and CMRR Rejection. The 171 provides better than 70 dB NMRR and 100 dB CMKR while maintaining a fast settling time of less than 2 seconds. d. Analog Output. The 171 has a 1-volt full scale output as a standard feature which allows continuous monitoring of analog data on a chart recorder or similar device. e. Optional Digital Output. The 171 also can be used with the optional Model 1712 Digital Output accessory which includes complete timing outputs and remote controls.