Product Overview

The Fluke PM 6685 Frequency Counter brings calibration lab accuracy to field measurements. The PM 6685 is easy to use, compact, and most important of all, it has today's smartest input triggering for frequency measurements. Cal lab performance in the field With 10 digits per second resolution, plus overflow (11th and 12th digits), it delivers high accuracy measurements instantly. The standard timebase offers a stability of better than 5E-7 per month, and better than 5E-11 per month with the PM 6685R Rubidium Counter. Built in capabilities simplify tricky measurements The PM 6685's built-in intelligence eliminates a lot of button pushing. Just plug it in, and it automatically selects optimum trigger level and input sensitivity for excellent noise immunity. Analog bar graph The analog bar graph displays signal strength and input sensitivity to assist instrument setup and RF tuning applications. Measurement functions Frequency, Burst Frequency, Period A, Ratio A/E C/A, Pulse Width A, Duty Factor, Totalize A. Auxiliary functions External Arming, External Gate, Nulling/Frequency Offset.