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Experimental Interface for Rustrak 288 Unit
(1) A 3 diode 'pair' off-set is included -- which is switchable; no diode, 1-diode, 2 diodes, or 3 diodes. Each diode pair introduces about 0.7 volts of off-set. pairs are used in case polarity reversal occurs in some tests.
(2) The 5k series resistor, Rs, is used to establish a voltmeter range betwen 0.5 & 5 volts, adjustable as needed for the GW circuit parameters used.