Details
It has been tested and is in good working condition.
Options Installed:
PM9623 - rechargeable battery unit for mounting inside the counter
PM9624 - 2.7 GHz Input C
PM9691 - Very High Stability Oven Time Base
Original Manufacturer Description:
The PM 6685 frequency counter from Fluke brings cal lab accuracy to field measurements. With 10 digits per second, plus overflow (displays 11th and 12th digits), it delivers high-accuracy measurements instantly. The PM 6685 is easy to use, compact and – most important of all – it has today’s smartest input triggering for frequency measurements. The battery option for the PM 6685 maintains oven stability for 20 hours, giving you instant oven performance even after long transportation Rubidium Counters The PM 6685 and PM 6681 are available as R versions with a Rubidium Timebase. Fluke Rubidium Counters are equipped with a Rubidium reference oscillator. The short warm-up time make them ready for use quickly after field transport or a change of location inside a building. The atomic resonance principle of rubidium standard is intrinsically 100 times more stable than the electromechanical crystal resonator. The built-in rubidium reference solves the practical problems of ensuring very high stability under tough field conditions. Attributes (Counters/Timers) Form Factor Benchtop Frequency Range 300 MHz
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