Thread: 400 Hz
View Single Post
  #5   Report Post  
Posted to rec.crafts.metalworking
Josepi[_19_] Josepi[_19_] is offline
external usenet poster
 
Posts: 180
Default 400 Hz

A crappy waveform would usually yield a frequency multiple of the base
frequency, though. 400Hz doesn't divide by 60 well or by 120Hz either.

400 Hz was a very common frequency used in avionics, especially on the
planes.

Open the beast up and look for a jumper or loose wiring. A careful look may
reveal something, if only some printing on the PCB card to indicate make,
model, freq or other spec.

All this assumes your engine hasn't gone crazy in speed to do this. I think
you would notice it screaming, if that was the case.

-----------


"PrecisionmachinisT" wrote in message
news:tYudncg0aOnWX7XTnZ2dnUVZ_vSdnZ2d@scnresearch. com...
It could be it is still 60Hz, but an extremely crappy or dirty
waveform is tricking the meter. That might change the diagnosis/
troubleshooting procedure.