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TM1 -6625-736-13&P
(6)
EXT ACC and EXT CLK
These inputs are used to drive the unit to frequencies and amplitudes which are not calibrated internally.
During normal operation these are not used. Inputs to these connectors should not exceed 5V and the
external clock input must have a ground reference to the unit through an external loop (not including its
BNC connection).
c.
Front Panel (figure 2-2). The front panel of the test set contains 28 LEDs, eight switches and the optical tester.
Each switch performs specific functions while each illuminated LED indicates a positive connection to power and
ground.
d.
Indicator lights. Each illuminated LED indicates the following:
(1)
INTERNAL POWER
This LED indicates the internal power supply is providing the 5V necessary for proper operation of the unit.
If this light is not illuminated the unit will not function.
(2)
MULTICHANNEL
Five LEDs in this group indicate a positive connection of 24V, PGND (24 V rtn), 15V and AGND (analog
ground).
(3)
TRACKER 1
Similar to the MULTICHANNEL section these LEDs indicate a positive connection from the unit to the
DAU. Illumination of these LEDs are not required to operate the unit.
(4)
TACHO 1
If using a magnetic interrupter only the SGND LED will illuminate.
(5)
ACC 1-14
Whenever an accelerometer is connected to the unit the GND OK LED for that accelerometer should
illuminate. Failure of illumination for a given ACC channel indicates a broken connection or cable.
e.
Eight switches on the front panel perform the following functions:
(1)
ACC 1-4
These switches connect the signal to the proper connector pins and allows for proper interfacing with the
correct accelerometer type. Connectors on each type are identical but internal wiring is different. This
switch permits proper interfacing and prevents an UACCELEROMETER FAULT' error message on the
Control and Data Unit (CADU).
(2)
ACTIVE/PASSIVE
Generates the simulated signals for the UTD.
(3)
TACHO CONTROL TACH
2 Generates a monopulse (unipolar) or bipulse (bipolar) on the channel 2 tachometer input.
(4)
TACHO CONTROL TACH 1
The switch position determines if a single bipulse drives Tacho Channel 1 or if a double bipulse marks the
target blade, with the rest of the blades generating a single bipulse.
2-3
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