Operation and Care of Circular-scale Instruments |
Contents
CHAPTER | 5 |
5DB12 Instruments 11Test and Inspection | 12 |
TROUBLE CHART FOR DC INSTRUMENTS | 23 |
Copyright | |
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12 o'clock position air gap ammeters and voltmeters anti-creep approximately attraction screw balance weights base assembly bobbin bracket bridge plate bumper calibration adjustments capacitor circular-scale instrument COIL Fig collet construction control spring core cover damping disk damping magnet damping vane DB-12 instrument dial dismantling Electric AB-12 electromagnet element shaft end play Exploded view external connections face-up position friction full-scale high-shock instruments impedor inductor inspection instru iron vane jewel screw laminations leads loosening magnet assembly magnetic shunt mechanism ment meter and synchroscope mid-scale mounting studs movement moving coil moving element moving vane Number nuts ohmmeter open circuits operation permanent magnet pivots POLARIZING COIL STATOR power factor meter rated voltage reactance reactor removed resistance cards resistor scale length series resistance set screws shields shift short circuits shown in Fig single-phase wattmeter soldered spring clamp spring holder stationary coil terminals three-phase top bridge torque transformer volt VOLTS washer zero adjuster