Calibration of MEP frequency transducer

[54M37]

My MEP-003a frequency meter is off so I would like to calibrate it. The Back of the frequency transducer has 2 adjustment screws labeled BAL and SPREAD. I would assume that the BAL screw is the same as the ZERO adjust and the SPREAD screw is the same as the SPAN adjust. Is the correct?

 

[armytruck63]

Is this the wiggling fingers type of gage? If you can get the manufacturer and model number of the gage itself, I might be able to find the actual calibration procedure for the unit. In the room next to me is a huge library of manuals going back as far as the early '60's.

It does sound like you are correct with your guesses.

 

[54M37]

I was going to use a Fluke meter with a frequency scale to monitor the actual frequency as I vary the engine speed corresponding to between 55 and 65 HZ. While doing so I was going to calibrate the transducer.

 

[cuad4u]

If you remove the transducer, connect its input to 120 VAC house current. The power company keeps it at exactly 60Hz or within just a few 1/100th of a Hz. Adjust the transducer so the meter reads exactly 60Hz, reinstall it, and you are good-to-go. I have done it several times.

 

[54M37]

cuad4u
Which one of the screws did you adjust?