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The 1823A and 1856D are reciprocal 2.4 GHz and 3.5 GHz frequency counters that are microprocessor controlled. Their LED displays can provide up to nine digits of resolution using an external time base with a 10 s gate time. The high accuracy, sensitivity, and versatility of these counters make them an extremely valuable instrument to scientists, engineers, and communications technicians for a broad spectrum of laboratory and service applications.
±1PPM Time base stability
Trigger level function (1823A only)
Frequency ratio measurement function (1823A only)
Time interval measurement function (1823A only)
RPM measurement function (1856D only)
External frequency standard input
Bright LED display
Low pass filter