Figure 2-12.
Front panel layout of Model 9461A Galvanometer
3.
Installation. The Model 9461A should be installed on a shelf in front
of the operator at approximately eye level.
a. The Model 9460A Nanovolt Amplifier lamp power cord is connected to
the two-pin connector on the left side of Model 9461A.
b. The line cord is connected to a line supply of 120 volts, 60 Hz, and
the galvanometer lamp is turned on by rotating the ON-OFF switch on the
left-hand side of the front panel clockwise.
A 3/4-inch light beam spot
with a vertical hairline should appear on the scale.
If it is greatly
deflected, or off scale, the zero knob on the suspension should be adjusted
to give an approximate zero, and the front panel zero will then provide a
range of adjustment of about 90mm. (Before adjusting the suspension zero,
note whether the mirror mounted on the inside rear of the cabinet is
approximately parallel to the rear panel.)
4.
Operation.
a. Controls.
(1) A front panel switch provides four decades of sensitivity
increasing from 1/1000 to 1/1 for use in initial balancing operations. At the
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