NO_CALIBRATION_OHMMETER

Published:2009/7/20 20:54:00 Author:Jessie | From:SeekIC

When unknown resistor RX is connected, milliammeter reading is RX/RC where RC is value of known standard resistor used. RX is then equal to meter reading in milliamperes multiplied by value of RC in ohms. Full-scale deflection is thus obtained on 1-mA meter when RX is 100K. Other ranges can be obtained by changing value of RC, using range switch if desired. Meter has automatic zeroing because VO rises to exactly 3 V when measuring leads are shorted and no current flows through meter.-V. Ramprakash, Direct-Reading Ohmmeter Needs No Calibration, Electronics, Nov, 11, 1976, p 115-116.



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