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A QUICK CHECK OF YOUR GALVANIC ISOLATOR.
chuck wrote in news:1153748524_106745
@sp6iad.superfeed.net: Using a Keithley electrometer, I measured a forward current of about 10 microamps at a voltage of 300 mV, consistent with the 675 mV/100 mA measurement. At this level, a lot of what the Keithley is measuring is the diode's own generated voltage. Hook the Keithley to a silicon diode sitting on the bench, not attached to anything. Depending on how hot it is (and how close to any radioactivity it is), there's always a junction voltage from the thermionic emission of the junction, itself. Got a hot radioactive source around? Keep the Keithley across the diode and move the diode up against any beta or gamma sources and watch it fly... (c; (Depleted uranium bullets are great for this experiment. They're free in Afghanistan and Iraq...) Which Keithley is it? I used to repair and cal them at the Metrology Laboratory of the Quality Assurance Office, Charleston Naval Shipyard (Code 132)...may she rest in peace. |
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