MIL-DTL-16034B
illumination coming from above and in front and at an angle 45 degrees from the horizontal centerline. Under these
conditions, there shall be no objectionable shadow on the graduated scale.
3.6.1.4.1.2 Portable meters. The scale and window shall be so designed that the window will extend a
minimum of ⅛ inch beyond all scale markings.
3.6.1.4.1.3 Window visual properties. When subjected to the visual conformance test (see 4.5.20), windows shall
exhibit no detrimental visual effect which will unduly interfere with the reading of the scale or legend under normal
lighting conditions.
3.6.2 Dial and pointer.
3.6.2.1 Dial. The dial shall be made of stiff material firmly secured to its mounting and readily removable. The
dial shall be of such material and so secured as to insure freedom from warping, fading, or other deterioration during
the test specified herein. Paper dials will be satisfactory only when adequately bonded to and backed by a metal
support and when they meet all tests specified herein without fading, discoloring, warping, or other deterioration.
3.6.2.1.1 Scale.
3.6.2.1.1.1 Length. The scale length shall be as specified in the specification sheet (see 3.1).
3.6.2.1.1.2 Divisions. The value of each scale division shall, whenever practicable, be either: one, two, or five of
the units measured or any decimal multiple or submultiples of these numbers. In the case of multiple-range meters or
of meters for other specialized uses, exceptions to this requirement may be necessary, but shall be avoided when
reasonably possible. The angle subtended by a scale division shall be not less than 0.5 degrees on portable meters, nor
less than 1 degree on switchboard meters.
3.6.2.2 Pointer. The meter shall have a pointer so formed as to permit accurate readings at the usual distance
from which the meter is viewed, and approximate readings up to the distance of legibility of the scale markings. The
pointer shall be of rigid construction and suitable for the intended application, and shall not become damaged or
distorted when subjected to any of the tests specified herein. The pointer shall not be affected or distorted by static
electricity on the meter lens.
3.6.2.2.1 Pointer clearance (parallax). Where the meter is not provided with means for avoiding errors in reading
due to parallax, the clearance between the pointer index and the graduated scale shall not exceed 0.10 inch, nor be less
than 0.03 inch. Portable meters shall have a mirror on the dial near the scale and directly beneath the knife-edge
portion of the pointer to reduce reading errors due to parallax.
3.6.3 Means of adjustment.
3.6.3.1 Accuracy adjustment. Meters shall be provided with practical shop means of adjustment to accuracy.
Charging of the magnet and magnetically treating it to obtain accuracy, or adjusting the internal resistor, shall be
considered as meeting this requirement.
3.6.3.2 Zero adjustment. Meters shall have a zero adjusting device accessible from the front of the case. The
device shall be capable of being rotated through 360 degrees, without damage to the device or any part of the meter
and without becoming inoperative or any parts becoming adrift or shall withstand 10 inch-ounces of torque without
damage, distortion, or jamming. A device capable of being rotated through 360 degrees is preferred. Zero adjustment
devices shall provide a range of adjustment above and below the zero mark on the scale of not less than 3 percent of
the scale length (see 4.5.2).
3.6.4 Terminals and connections.
3.6.4.1 Portable meters. Binding-post terminals shall be so constructed that they cannot turn or twist in their
mounting. Voltmeter terminals shall be insulated caps with no live parts exposed on cap nuts.
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