FEC200 Ratio Test
The RATIO test is used to obtain the ratio of the readings taken by two other tests performed earlier in the test sequence.
- TESTn RATIO 5 6 >1.1
In this example the result will be the results of test 5 divided by the results of test 6. The range of valid ratios is .001 to 32.767. This test will work on the results of any other pair of tests. The significance of this ratio however depends on the types of tests compared and the scaling used. In many instances this will not be an issue, but the contrived example below will illustrate the point (This example will NOT work).
- TEST3 IR 3V <10ľA
- TEST4 IR 10V <20ľA
- TEST5 RATIO 4 3 <2.5
The problem is that test 3 will use the 16.383ľA scale and test 4 will use 163.83ľA. You can fix this by changing test 3 as follows:
- TEST3 IR 3V <10ľA 20ľA
The added 20ľA item forces test 3 to use the 163.83ľA scale. Test 4 already uses that scale. The three sequence numbers do not have to be sequential as in the example. The only requirement is that the two reference tests must always be performed before the RATIO test. The results will be invalid if either of the reference tests is skipped because of a conditional jump.