APPLICATION NOTE: Advanced Energy Trek 820 Voltmeter Measurement Applications
■The Advanced Energy Trek 820 is an ultrahigh input impedance voltmeter that can perform contacting measurements without disturbing the surface charge and potential of an object under test. The convenient hand-held probe enables electrostatic measurement testing using a contacting measurement procedure.
■Unlike non-contacting electrostatic voltmeters where there is no physical contact between the test sample and the voltmeter, and therefore, no charge transfer to/from the sample, contacting measurement technology always requires consideration of charge transfer issues. An ideal voltage measuring instrument has the challenge of measuring the voltage of a sample without altering the charge/voltage of the sample; the Model 820 voltmeter meets that challenge.
■For example, if an ordinary voltmeter is used to measure the charge associated with a pin of an IC chip, when the instrument makes contact with the pin, all of the charge associated initially with this pin will be removed. As a result, the voltage indicated would be erroneous (the voltmeter will indicate 0 volts). However, the Model 820 can measure the pin voltage without discharging or affecting its voltage.
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Application note & Design Guide |
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Please see the document for details |
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