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Multimeter Problem.

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Please help. I have a second hand P.O. meter no 12 C/1. It is a moving coil meter. It reads o.k. on Volts but under reads on Ohms. The zeroing pot does not seem to work. A label inside states that it has thick film components. Why won't it read Ohms accurately? Can it be repaired.

Thanks,

Z.

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    John Peckham: 
     

    In my day the Meters Multirange 12A, 12B and 12C were made by Taylor not AVO. The 12A appeared in the background of Thunderbirds on a fancy control panel so know as a Thunderbirds meter. Nice brown leather case. 

    Try a clean up of the battery contacts and the range switch contacts. I cant remember if there was one or 2 batteries? In any case change them for new.

    When you were promoted from Technician to Technical Officer you could order up a meter multi-range  14C which was either a GEC instrument or an AVO 8 if you were lucky when you opened the box.

     I have a small collection of AVO 8s which I might be persuaded to dispose of for a reasonable sum if you want a proper analogue meter Zoom.

    Hello John, I have an AVO 8, but it has been converted to a table lamp and is now a decorative feature. But I suppose that the lamp cold be useful if I need to use the meter in dark places.

    I will further investigate the P.O. meter when I get time.

    And yes, the P.O. meter does have a lovely leather case.

    Z.

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  • 0

    John Peckham: 
     

    In my day the Meters Multirange 12A, 12B and 12C were made by Taylor not AVO. The 12A appeared in the background of Thunderbirds on a fancy control panel so know as a Thunderbirds meter. Nice brown leather case. 

    Try a clean up of the battery contacts and the range switch contacts. I cant remember if there was one or 2 batteries? In any case change them for new.

    When you were promoted from Technician to Technical Officer you could order up a meter multi-range  14C which was either a GEC instrument or an AVO 8 if you were lucky when you opened the box.

     I have a small collection of AVO 8s which I might be persuaded to dispose of for a reasonable sum if you want a proper analogue meter Zoom.

    Hello John, I have an AVO 8, but it has been converted to a table lamp and is now a decorative feature. But I suppose that the lamp cold be useful if I need to use the meter in dark places.

    I will further investigate the P.O. meter when I get time.

    And yes, the P.O. meter does have a lovely leather case.

    Z.

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