TB 9-4920-463-24
a. Connect accelerometer cables supplied with TI and dress them around behind
Vibrex tester and crossed so there will be no force from cables that might pull the cam-
followers away from cam. Connect the other end of accelerometer cables to accelerometer
channel A and B of TI.
b. Connect magnetic pickup cable between Vibrex tester and magnetic pickup
channel A of TI.
c. Connect TI dc power cable to Vibrex tester.
d. Connect Vibrex tester to dc power supply and adjust dc power supply output to 28V.
e. Set TI controls as follows:
(1) INTERRUPTER LOGIC switch to DOUBLE.
(2) MAGNETIC PICKUP switch to COMMON.
(3) RPM RANGE switch to X10.
(4) RPM TUNE dial to 180.
(5) FUNCTION switch to A.
f. Verify that all six screws are installed in the edge of Vibrex tester rotor disc.
g. Set Vibrex tester CAM RATE switch to 1800 and MOTOR ON switch to ON.
12. Double Interrupter Logic Test
a. Performance Check
(1) Press and hold TI TEST pushbutton.
(2) Verify that 12:00, 6:00 and 1:00 o'clock lights light (a light at 12:30 o'clock
instead of 1:00 o'clock is permissible).
(3) Release TEST pushbutton and observe clock position of lighted light.
(4) Push and hold VERIFY TUNE pushbutton on TI and adjust RPM TUNE dial
to return light to clock position observed in (3) above.
(5) Release VERIFY TUNE pushbutton and observe new clock position.
(6) Repeat (4) and (5) above until there is no change whether pushbutton is pushed
or released. Read the clock position with VERIFY TUNE pushbutton released.
(7) Verify the following indications on TI:
(a) PHAZOR indication is between 2:30 and 3:30 o'clock.
(b) IPS meter indication is between 0.72 and 0.88.
(c) RPM TUNE dial is between 176 and 184.
(8) Set Vibrex tester CAM RATE switch to 900.
(9) Set TI RPM RANGE switch to X1, and RPM TUNE dial to 900.
(10) Repeat (3) through (6) above and verify the following indications:
(a) IPS meter indication is between 0.36 and 0.44.
(b) RPM TUNE dial is between 882 and 918.
