5
DRAFT
A vacuum fluorescent display provides indication that the unit has been selected as the slave unit. LEDs
provide status indication of power ON and battery charging status. The emergency shut off switch
provides an instantaneous disconnect of all testing signals and controls to the MU railcar lines and MU
jumper cables should unsafe conditions occur for any reason. Note that the emergency shut off switch
does not remove power from the entire test unit.
2.2. The Designated Master Unit
The MU Cable Tester Unit designated as the master unit controls the operation of the entire test system.
The master unit performs a self test, a test for short circuits between conductors, and a test for leakage
to chassis. It establishes a two-way communication link with the slave unit and controls the operation of
the slave through this link. The conductor continuity test is performed by the master commanding the
slave unit to connect a capacitive coupled path between selectable conductor pairs. Any conductor pair
combination may be measured for normal or open conductivity.
Each designated master unit contains a control panel, an MU connector receptacle, a locomotive
chassis lug terminal, an internal battery, and a battery charger/power adapter. The front panel controls
and indications allow the operator to perform the desired tests and view indicated test parameters. A
vacuum fluorescent display provides textual indication that the unit has been selected as the master
unit; the display also provides test system status and function control options of the tests while in
operation.
Control panel function buttons become illuminated when a control function is available for any given test
option at any given stage of the testing process. LEDs provide status indication of power ON and battery
charging status. The emergency shut off switch provides an instantaneous disconnect of all testing
signals and controls to the MU railcar lines and MU jumper cables should unsafe conditions occur for
any reason. Note that the emergency shut off switch does not remove power from the entire test unit.
2.3. Battery Charger/Power Adapter
The battery charger/power adapter power cable plugs into any standard 120 VAC power receptacle; the
output from the charger plugs into a power input connector in the control panel of each MU Cable Tester
unit. The charger provides operational power to the MU Cable Tester and is used to recharge the
sealed lead-acid battery housed within the unit. The battery charger/power adapter is stored in the
external storage pouch for transport.
3. OPERATION
Operation of the MU Cable Tester System requires two tester units, one to first be designated as Slave
and the other designated as Master. These units must be operated from a stable surface capable of
physically supporting the unit while connecting and disconnecting an MU jumper cable to the test units
as well as to a railcar MU Cable receptacle.
3.1. Setup – Slave Unit
3.1.1.Open and remove the cover of either test unit.
3.1.2.Set the On/Off Power switch to the OFF position.
3.1.3.Set the Emergency Shut Off switch to the home (reset) position
A. Twist the red button clockwise to release it to the home state.
3.1.4.Designated slave unit does not use Chassis Test Lead.
3.1.5.Locate the AC Power Adapter from the storage pouch
A. Insert the delta shaped power cord plug into the matching adapter block receptacle.
B. Plug the 18VDC power connector to the matching receptacle on the MU Cable Tester
control panel labeled: 18VDC POWER.
16814-99 Rev. A
