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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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27th Sep 2014, 4:42 pm | #1 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,510
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Moving Iron Meter Calibration
Is it likely that a moving iron voltmeter (0 - 250v), intended for use at 400Hz, will measure accurately at higher frequencies, up to 1600Hz?
I'm not sure what affects the calibration of a moving iron meter! Many thanks, Andy |
27th Sep 2014, 8:03 pm | #2 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
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Re: Moving Iron Meter Calibration
Thickness of any laminations..... impedance of coil.....
I would expect it to read low if anything. Sounds like time for a trial with a sig gen and 'scope to see what happens.
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27th Sep 2014, 8:09 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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Re: Moving Iron Meter Calibration
They're definitely frequency-sensitive. And profoundly waveform-purity-sensitive too: you don't want to trust them to read accurately if fed from a "modified-sinewave" power-inverter/UPS or if wired across a circuit where the power-factor is significantly off from unity.
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28th Sep 2014, 9:40 am | #4 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,510
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Re: Moving Iron Meter Calibration
Thanks for the replies..................even if they don't give the answer I was hoping for!
I shall have to think again. Andy |