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A QUICK CHECK OF YOUR GALVANIC ISOLATOR.
Larry wrote:
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. Indeed! Actually the junction voltage was ~50 millivolts so I "tuned it out" as they say. 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...) I could try a smoke detector or Coleman lantern mantle with thorium, I guess. I'll pass on the DU though. 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. It's a 610B with electrometer tubes. Works amazingly well for its age. It does have a personality as you know. Chuck ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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