. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. METERS Scale length Limits of error % 1J in. up to (but not including) 2 in. 2 in. up to (but not including) 3i in. 3i in. and over 2-5 2 1 Similar accuracies are decreed for moving-iron voltmeters, and moving- iron ammeters are allowed slightly larger errors, but in both cases the limits only have to be met between 20 and 100 per cent of full scale. Non-linear moving-coil movements Particularly in war surplus equipment, one occasionally comes across moving-coil movements having non-linear
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. METERS Scale length Limits of error % 1J in. up to (but not including) 2 in. 2 in. up to (but not including) 3i in. 3i in. and over 2-5 2 1 Similar accuracies are decreed for moving-iron voltmeters, and moving- iron ammeters are allowed slightly larger errors, but in both cases the limits only have to be met between 20 and 100 per cent of full scale. Non-linear moving-coil movements Particularly in war surplus equipment, one occasionally comes across moving-coil movements having non-linear relationships between current and deflection, often approximately logarithmic, and these are often Figure In the case of end-zero meters, the law may be obtained by shaping the permanent magnetic pole pieces as shown in Figure With the coil in the position shown the permanent-magnet field encountered is strong, but weakens as the coil turns clockwise. This gives a scale which is expanded on the left and cramped at the right. Centre-zero movements for null- detection may be made sensitive in the region of the null-point by using pole pieces as shown in Figure , or by using conventional pole pieces and an elliptical central armature {Figure ).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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