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The Merlin instrument represents a concept to product development. The customer requested the design and development of a product to be added to their instrument line. This instrument was to be capable of very low noise voltage measurements, in particular for detectors. Operation was to include voltage measurements synchronized to a light-chopper wheel driven by the Merlin instrument, and capable of chopping frequencies of 10 to 1000 Hz. Only the sine wave fundamental was to be extracted from this chopped signal. Requirements also included a front panel interface using a graphics LCD display and user interactions through menu selections on this display. Simultaneous measurement of a reference channel provided signal normalization by ratio. Seamless dynamic range was from tens of nanovolts to 5 volts RMS. Accessories included additional signal channels and communications capabilities such as serial RS 232 and GPIB. The technologies used covered a broad range of analog, motor speed control, digital signal processing, packaging such as circuit boards and housing. We developed the entire instrument and delivered a complete package so that the customer simply had to manufacture and sell it.
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