Re: AVO 8 mk 2 not working for ohms
The (cheesehead) screws have a crinkle washer underneath, which does the job...most of the time. Unfortunately one of the screws on an early type Model 8 is inaccessible under the transformer.
Spencer, basic calibration of the magnetic flux can be done using a precision voltage source (usually on the 10v DC range) If all the resistances are in spec. then tweaking the magnet shunt (with non ferrous tools) to ensure accuracy on this one voltage range should transfer accuracy to the other ranges- provided all switches are clean and operating correctly. The resistance ranges are inherently calibrated by the operator when he manually zeroes the pointer @ FSD. (Always provided the movement is healthy, of course)
Component accuracy on a Model 8 MkII has stood the test of time well, it's unusual to find a shunt that has gone outside spec. (though you might find a winding here and there that has rotted and gone open circuit) AC readings can drop out somewhat if the rectifier has been abused or has corroded.
Dave
|