TB 9-4920-463-24
Figure 2. Tester interrupter placement.
e. Connect frequency counter to magnetic pickup on TI using a BNC to test hook type lead.
f. Set TI CAM RATE (RPM) switch to 1800.
g. Set TI MOTOR ON switch to MOTOR ON.
8. RPM Test
a. Performance Check
(1) View rotor disc under ordinary fluorescent room lights (60 Hz) and adjust TI
1800 RPM adjust (fig.1) until outer ring appears stopped. Frequency counter will indicate
30 1 Hz.
NOTE
If frequency counter does not indicate 30 1 Hz, take
corrective action to insure line frequency of fluorescent lighting
is 60 Hz.
NOTE
To convert frequency counter indication to RPM, multiply by 60.
(2) Set TI CAM RATE (RPM) switch to 900.