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pmmunro · 8th Jul 2005, 11:24 pm

The serial number on all "Standard" Avometers is at the extreme lower right-hand edge of the scale plate. You may have to hold the meter vertically and look down past the edge of the window.

Most military meters have the serial number in the same place, but there may be variants. Numbers at the left hand side scale plate are usually part numbers for the scale plate itself.

On later meters, from the late 1960s, a figure in the range 1 to 12 at the bottom centre of the scale plate is the type number for the "scale-shape" or law of the scale. The movements were calibrated for linearity and one of the range of scaleplate types which best suited its characteristic - giving an accuracy of better than 1% on direct current - was fitted.

If the movement has been changed, the original serial number should have been written on the new movement's scale plate but this is not always done.

The serial number should be of the form XXXX-(m)m-yy, where m is the month and y the year.

8th Jul 2005, 11:24 pm	#70
pmmunro Octode Join Date: Jul 2004 Location: Dundee, UK. Posts: 1,813	Re: AVO Multimeter survey The serial number on all "Standard" Avometers is at the extreme lower right-hand edge of the scale plate. You may have to hold the meter vertically and look down past the edge of the window. Most military meters have the serial number in the same place, but there may be variants. Numbers at the left hand side scale plate are usually part numbers for the scale plate itself. On later meters, from the late 1960s, a figure in the range 1 to 12 at the bottom centre of the scale plate is the type number for the "scale-shape" or law of the scale. The movements were calibrated for linearity and one of the range of scaleplate types which best suited its characteristic - giving an accuracy of better than 1% on direct current - was fitted. If the movement has been changed, the original serial number should have been written on the new movement's scale plate but this is not always done. The serial number should be of the form XXXX-(m)m-yy, where m is the month and y the year.