INTRODUCTION The Keithley Mode! 177 Microvolt DMM is a versatile, highly sensitive digital multimeter which is used for measurement of DC and AC voltages, DC and AC currents, as well as resistance. For a complete summary of ranges for each of these five functions, refer to the specifications at the front of this manual. Ranges and functions are easily selected with front panel pushbuttons, while connections for ail functions are easily made with a single set of front panel input terminals. MODEL 177 FEATURES 1. 4 1/2 Digit LED Display—An easy to read 4 1/2 digit display shows 20,000 counts of information with automatic polarity indication. 2. 1µV/1mΩ Resolution—The Model 177 is capable of reading DC voltages as low as 1µV and resistances down to 1mΩ. 3. Front Panel Zero—The front panel zero control may be used to compensate for thermal offsets or lead resistance when making measurements. 4. Analog Output—An analog output of 1V/10,000 counts is available on the rear panel.