High accuracy - better than 0.01 ppm at 100 Ohms (RBC100A)
Patented design licensed from IRL
Windows application for full analysis and reporting
The RBC AC and DC resistance bridge calibration system exploits the same principles as the linearity and complement check. This resistance calibrator uses a network of four stable four-terminal resistors that can be connected in 35 different series and parallel combinations. By measuring each RBC combination in the two different ways (as with the complement check), up to 70 different measurements can be made.
Since the RBC has just four unknown resistance values, we have up to 66 independent measurements containing information about the errors in the bridge readings. The combinatorial calibration method is particularly powerful because it is not necessary to know the actual values of the four resistors, or their frequency dependence. This means we can calibrate any ac resistance bridge or dc resistance bridge to any accuracy, so long as the various resistance combinations are accurate.