For example: Agilent E4440A or Anritsu 68369
Calibration Fixture
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ESI 230B Overview
The ESI 230B Resistance Bridge features large, easy-to-read numbers in a single line to reduce reading errors. The range switch automatically sets the decimal point and indicates the unit of resistance. Guarded terminals are provided to allow connection of unknown resistors for either two- or three-terminal measurements. Extremely accurate, high resolution, guarded Wheatstone bridge Measures continuous range of resistance values between 0 and 12 Gohms Six-place direct readout, 11 ranges Accuracy: 0.01% or 1 dial division (whichever is greater) Resolution: four decade switches and 105 divisions, interpolating rheostat provide 1,200,000 dial divisions