Those are not references, but rather are AC thermal transfer standards.
The way they work is you apply an unknown AC voltage to it, and measure the DC voltage generated by its thermocouple. Then you remove the AC voltage, and apply a DC voltage that gives the same thermocouple voltage. Usually, you apply the DC voltage with both polarities, and average the two readings... which helps to null out any thermocouple errors. To successfully use an AC thermal transfer standard it helps to have the controller instrument that goes along with it. Fluke makes as nice setup, as did HP. At their best, they are twidgety, and quite sensitive to ambient temperature variations, physical orientation, air currents.... Apply too much voltage, and like the light bulbs that they resemble, they go poof! I don't think any metrologist has ever been truly happy with the AC thermo transfer standard. -Chuck Harris John Phillips wrote:
Is there a better AC reference I can afford than http://www.ballantinelabs.com/1395.htm 1395B-XX
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