Pendulum
offers a choice of two high-performance timer/counter models; the
ultra-fast/ultra-resolution CNT-81 and the CNT-81R with built-in
Rubidium timebase. The counters are equipped with GPIB-interface as
standard, for use in automatic test systems, or in PC-controlled
instrument clusters on the lab bench or workshop bench. The standard
frequency range of 225/300 MHz can be extended to 2.7 GHz. With the new
8 GHz prescaler input option, the frequency measuring range is extended
into 8 GHz. Optional timebase oscillators extend the timebase stability
to 0.02 ppm/year. The CNT-81R has a built-in atomic clock standard
(Rubidium).