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Temperature has no effect on the reading of the meter because the transducer's output is current which is the same all along the circuit. Now if the output were voltage, there would be thermal drift as the resistance of each element in the circuit.

The meters are sealed. The screw on the crystal slightly alters the spring force keeping the needle to the left (in this case). Changing it for a single point calibration is perfectly fine since 60 Hz is the desired reading. These meters have internal balance weights which are adjusted at...

The frequency transducer makes a current that is an analog of the frequency. Back in the 70s when these were designed, high speed digital circuits, timers and counters were far outside of the mature state for a toughened military service. The meter is nothing more than a micro-ampere meter...

True, but the "full scale" needle movement (bump stops) is wider than the 55-65 Hz "window". I deduced the function of the meter by pure observation. Just like a shunt ammeter, the scale is arbitrary. only through the current-frequency instead of Ohm's Law. The transducer is a current...

That troubles me...unless the transducer's output varies based on impedance (resistance) and measuring its output at higher values (400+ ohms) causes output to drop. Do you have any solid DC resistances on the typical 002/003A frequency meters? I measured 570-580 ohms on two samples, one...

I took my transducer out to look at the potting. Mine is a Technology Research Corporation unit in a spot welded case, sealed with silicone caulk and then potted in silicone rubber. I wouldn't worry a bit about the leaking oil causing failure. Same part number so they should be...

Not as much as it to prevent water intrusion. From the looks of your unit, it has never gone swimming. If you keep it out of the weather, you should be fine. There isn't any real heat generated in the transducers. Only a few microamperes. I measured between 20 and 554 microamperes for an...

My frequency meter is corroded to death. I just bought a digital multimeter with frequency measurement capacity and use that. As a bonus, it is true RMS, meaning proper measurement of alternating current. If your transducer is working, it would be best to keep it. Have you tried to plug the...