Request InfoMcPHERSONMcPherson Inc. offers the 671MX amplifier, a high-vacuum-compatible, current-to-voltage converting device developed for use with vacuum UV silicon photodiodes. With an integral socketed photodiode mount, the combination detector/amplifier hybrid can be used to measure small photogenerated currents with resolutions of 10 fA and dynamic ranges of four orders of magnitude. The device consists of a very low noise operation amplifier with selectable feedback resistor. The feedback resistor is socketed and may be changed to match gain and dynamic range requirements. 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