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The Oriel Light Bias Amplifier is designed for use in QE measurements of various photovoltaic cells where an external light source and/or voltage source are used to bias the cell under test. The Light Bias amplifier sources current to maintain a fixed voltage bias across the PV cell under test. Generally, QE testing is performed at a zero voltage DC Bias, but with a suitable external low-noise voltage source, it is possible to select a different DC voltage bias for further characterization purposes. This current has a DC component, and an AC component.