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TROUBLE CHART FOR DC INSTRUMENTS
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12 o'clock position AB-12 Instruments air gap ammeters and voltmeters anti-creep approximately balance weights base assembly bobbin bracket bridge plate bumper calibration adjustments capacitor circular-scale instrument collet construction control spring core cover damping disk damping magnet damping vane dial dismantling electrical electromagnet element shaft end play external connections face-up position frequency meter friction full-scale high-shock instruments impedor inductor inner pole piece Inspection instru instrument shown iron vane jewel screw leads loosening lower jewel magnet assembly magnetic shunt mechanism ment meter and synchroscope mid-scale mounting studs movement moving coil moving element moving vane Number ohmmeter open circuits operation phase pivots Pointer sticking polarizing coil polyphase wattmeter power factor meter rated voltage reactance reactor reassemble removed resistance cards resistor scale length series resistance set screws shields shift short circuits shown in Fig Single-phase wattmeters soldered spring clamp spring holder stationary coil stator three-phase top bridge torque transformer washer Westinghouse zero adjuster