1. In this instrument the current comparer is set to zero magnetic flux, then the instrument transformer calibrator with the theory of measurement can measure the error of the current transformer.

2. Also shows how to perform more complex comparisons based on a custom comparer.

3. Produces the set union of two sequences by using the default equality comparer.

4. Produces the set difference of two sequences by using the default equality comparer to compare values.

5. Sorts the elements of a sequence in ascending order by using a specified comparer.

6. Some teaching material treat that the integrated operational amplifier which makes up the voltage comparer only works in the nonlinear area.

7. Produces the set intersection of two sequences by using the default equality comparer to compare values.

8. The key of this invention is the realization of comparer, counter, latch and system pulse generator.

9. The price performance ratio is superior to that A/D converter combined with comparer and RC circuit by way of software PWM method.