Figure 7.
Control panel - center.
f. The tachometer, tachometer pulley calibration control, and tachometer
circuit selector (fig 5) are used to measure revolutions per minute (RPM) during
the testing of direct driven generators, pulley driven generators, and alternators.
The 0-12,000 RPM scale is read when using the high speed driving head. When using
the low speed driving head, the 0-5,000 RPM scale is used. The tachometer circuit
selector switch is a two-position switch. It can be set for "Direct Drive" or "Cal
Pulley." When testing direct driven generators or alternators, the tachometer
pulley calibration control is set in the counterclockwise position and speed (RPM)
is read directly from the meter scale. Adjustment of the tachometer pulley
calibration control is determined by formula when the unit being tested is pulley
driven.
OS 010, 3-P8
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