Try also halving and doubling the input voltage levels, and reversing the inputs at each level. Does the meter appear to respond in a linear fashion?
If yes to the above, then this is a good sign that the meter is functioning correctly and the next step is to start substituting it back into the intended application. If not, and assuming the meter is otherwise unmodified, then this is indicative of a fault. However, it usually worth performing a few basic checks, as outlined in 1. through 5., above, to verify that wiring and other voltage levels are indeed correct. Having proven the meter’s function to be O.K., start substituting connections back to those of your original circuit, in phases, starting with IN HI & IN LO. By progressively re-introducing first the connections and then the meter back into the intended environment, the nature of the wiring / application fault should become obvious. 8. Transients, etc. While not strictly part of the basic fault finding process, the subject of transients is worth a quick, or passing, comment. Although this is probably one of the most difficult areas to design-out, here are some suggestions.
Related Questions
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