Can I use the AUX Inputs on the WT1800 in the Math Functions?

Yes, the AUX inputs on the WT1800 can be used in the Math functions.
 
For example, if you wanted to measure a DC bus input using the AUX inputs (input elements not connected), you would scale one of the AUX inputs to the desired voltage and the other for current.  Then in the Math function, input the Math expression AUX1() x AUX2().  Even though there are no input elements for the AUX inputs, the () are still required when putting in the formula.

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WT1800 High Performance Power Analyzer

The WT1800 Power Analyzer offers maximum flexibility with up to six wattmeter elements, high bandwidths, simultaneous high speed digitizing, and wide voltage and current ranges. Although this model is still available, the newer WT1800E offers higher accuracy.

Power Analyzers and Power Meters

Measure characteristics of devices that generate, transform or consume electricity. Also called power meters or wattmeters, these devices measure parameters such as true power (watts), power factor, harmonics, and efficiency.

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