![]() I guess it is better to be stuck on and functional rather than stuck off, but if it isn't turned off, the battery inside will drain. It is always on, as the Power Off and Power On buttons don't do anything. The only problem I've encountered is with the SBT machine. ![]() but what the chips on the logic board do is still a mystery to me. I've gone through all three of them, stripping one down to the base plate to acid etch, prime, and repaint it, and as a result have become familiar with how they are constructed. I now own two ARBST machines, and one SBT machine. I use a current (amperage) probe and a digital oscilloscope to calculate the RPM of an electric fuel pump or HVAC blower motor using a similar method-I study the oscilloscope pattern to learn how many armature bars the electric motor has, then determine the milliseconds it takes for one revolution of the motor (the oscilloscope does the calculating.) Then divide 60,000 by the milliseconds for one revolution. ![]() Then you could work backwards using some guess at typical alternator-to-crankshaft pulley-ratio to make a stab at crankshaft RPM. Divide 60,000 by the time (in milliseconds) it takes to complete three ripples, you have alternator RPM. Either way, there's three windings on the stator, and thus three ripples per alternator revolution. All automotive alternators I'm aware of have either "Delta" or "Wye" stators. Wouldn't be hard to get it to "read" alternator RPM, though, by measuring diode ripple vs. Click to expand.Yes, used "Professional Grade" shop equipment is a bargain, and does PROPER testing that consumer-grade junk cannot do.įirst Guess: It cannot read engine RPM.
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