The instruments are necessary for diagnostic and troubleshooting. To carry out the maintenance work, the maintenance tools and materials should be available to the maintenance technician. The wrenches, Ellen keys, screw drivers are standard shop-tools & therefore need not be included in the tools and instruments list.
Following are the Instruments used for fault finding in electrical devices:-
- Volt ohmmeter ac/dc
- 500V Megohmmeter
- Circuit breaker & relay test set
- Vibration – amplitude meter
- Centigrade thermometer
- Tachometer
- Hook-on ammeter
- Magnetic compass
- Mechanical voltage tester
- External shunt ammeter with 50 mV shunts
- Growler
- Phase sequence indicator
- Motor rotation indicator
- Hook on wattmeter
- Hook on power factor meter
- High potential test set
- Insulating liquid test set
- Hydrometer
- Industrial Analyzer
- Thermal Image Camera
Maintenance tools & materials:-
- Spring scale (0-5 Lbs.)
- Filler gauges (tapered) for air gap measurements
- Smooth mill file for contacts
- Commutator Stones
- Brush Seating Stones
- Under cutting tools
- Canvas commutator wiper
- Soldering iron
- Insulated fuse puller
- Two cell flashlight (insulated)
- Small mirror with extension handle & knuckle joint