Keithley 502A

Keithley 502A


The Keithley 502A is a used Millohmmeter.

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The Keithley 502A Millohmmeter is designed for fast, accurate low resistance measurements in the laboratory and the field. 

It gives rapid indications without zero drift or errors due to thermal emf’s.

Readings are presented on a linear scale in 13 overlapping ranges.

Minimum detectable resistance is about 0.00003ohms.Typical applications include resistivity measurements.

  • Sensitivity to 30 micro ohms
  • Accuracy 3% of full scale
  • Dissipation less than 2 microwatts
  • Voltage across sample less than 25mV peak to peak
  • Battery operation better than 360 hours