April Instrument, Inc.

April Instrument was founded in 1989 to bring portability to the microwave signal generator field. Changes in microwave components allowed this to happen including the advent of MMIC's ( monolithic microwave integrated circuits ) which made possible a new level of miniaturization at reduced cost. Our first product was the model 8001 which was introduced in the November, 1989 issue of "Microwaves & RF" magazine. This unit weighed in at a tiny 2.5 lb. It was soon followed by the model 8002 which extended the frequency range of the 8001 from 2-8 to 2-10 GHz. Next came the model 8003 which was featured on the cover of June, 1997 issue "Test and Measurement World". The 8003 extended the frequency range to 2-20 GHz. With the 8003 internal adjustments were eliminated in favor of digital correction for improved ease of calibration and frequency accuracy. A universal input, 90-250 VAC, power supply simplified use in the international marketplace. Subsequent to the 8003 have been models that extend frequency coverage down to 0.5 GHz and up to 26.5 GHz.