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Abstract
An automatic compensation circuit (back-off circuit) is described which incorporates a sample-and-hold amplifier with a digital memory in order to avoid droop problems at long durations of measurement. This device is helpful in pulse radiolysis and laser-flash photolysis experiments on the nanosecond to second timescale. The range of current compensation is ±5 mA. The resolution is ±1.27 μA and the accuracy is better than ±1% for a range of compensation of 0.15 to 5 mA. A voltage output is provided as a measure (1 V/mA) of the compensated current.
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