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How To Test Ballast?A Simple Test For a Few

How To Test Ballast?A Simple Test For a Few

September 19 , 2023 0

Ballast (ballast resistor) is a fluorescent lamp on the role of current limitation and generate instantaneous high-pressure equipment, it is made in the silicon steel made of iron core wrapped enamelled wire made of such coils with iron core, in the instantaneous open/close the power, it will be self-induced to generate high pressure, added to the electrodes at both ends of the fluorescent tube (filament). This action is carried out alternately, when the starter (jumping bulb) closed, the filament of the tube through the ballast current limiting conduction heat, and the lamp will be turned on and off.

How To Judge If The Ballast Is Broken

Determining whether a ballast is damaged is relatively simple and only requires going through the following steps:

Use a multimeter to select a resistance level.
Connect one test pen to one port of the multimeter and the other test pen to the other port.
Touch the test pens to the pins on each end of the ballast.
Determine if the ballast is normal based on the values displayed by the multimeter.

A Few Simple Ways To Fix The Ballast

If the ballast is found to be broken after testing, we can try to fix it as follows:

Test the damaged ballast with a multimeter to find out the fault point in it.
Use soldering tools to repair or replace the components at the point of failure.
Reinstall the repaired ballast.
Reconnect the circuit and test it.

Introduction To Several Common Ballasts

Inductive Ballast

When the switch is closed in the circuit to apply 220V 50HZ AC power supply, the current flows through the ballast, the lamp filament starter to the filament heating (the starter is disconnected at the beginning, due to the application of a greater than 190V or more than the AC voltage, so that the starter within the jumping bubble of the gas arc discharge, so that the bimetal heating deformation, the two electrodes rely on the two electrodes to form a pathway to the filament heating), when the The two electrodes of the starter lean together, because there is no arc discharge, the bimetal sheet cools down, and the two poles are separated, due to the inductive ballast is inductive, when the circuit is suddenly interrupted, at both ends of the lamp, a pulse voltage of 600V-1500V with a duration of about 1ms will be generated, and its exact voltage value depends on the type of the lamp, and in the case of a discharge, the voltage at the two ends of the lamp drops immediately, and at this time the ballast has on the one hand a lamp At this time, the ballast, on the one hand, has a limiting effect on the lamp current and, on the other hand, produces a phase difference between the supply voltage and the lamp's operating current of 55. to 65, thus maintaining the lamp's secondary starting voltage and enabling the lamp to work more stably.

Inductive ballast due to the simple structure, as the first fluorescent lamps with the work of the ballast, its market share is still relatively large, due to its low power factor, low voltage starting performance is poor, energy-consuming bulky, stroboscopic and many other shortcomings, its market is slowly being replaced by electronic ballasts, inductance ballast energy loss: 40W (lamp power) + 10W (inductance ballast heat loss) is equal to the whole set of The total power consumption of the lamps is 50W.

Electronic Ballasts

An electronic ballast is a converter that converts an industrial-frequency AC power supply into a high-frequency AC power supply, and its basic principle of operation is:

Industrial frequency power supply through the radio frequency interference (RFI) filter, full-wave rectifier and passive (or active) power factor corrector (PPFC or APFC), into a DC power supply. Through the DC/AC converter, the output 20K-100KHZ high-frequency AC power supply, added to the LC series resonance circuit connected to the lamp to heat the filament, but so that the lamp "discharge" into a "conduction" state, and then into the light-emitting state, at this time, high-frequency inductor To limit the role of increasing current to ensure that the lamp to obtain the normal operation of the lamp voltage and current, in order to improve reliability, often add a variety of protection circuits, such as abnormal protection, surge voltage and current protection, temperature protection and so on.

Multimeter

Multimeter, also known as multipurpose meter, multi-meter, triple meter, complicated meter, etc., is an indispensable measuring instrument in power electronics and other departments, generally to measure voltage, current and resistance as the main purpose. Multimeter is divided into pointer multimeter and digital multimeter according to the display mode. It is a multifunctional, multi-range measuring instrument, generally the multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, etc. Some can also measure AC current, capacitance, inductance and some parameters of semiconductors (e.g., β) and so on.

Multimeter can not only be used to measure the resistance of the object being measured, AC and DC voltage can also measure DC voltage. Even some multimeters can measure the main parameters of transistors and the capacitance of capacitors. Fully master the use of multimeter is one of the most basic skills of electronic technology. Common multimeters are pointer multimeters and digital multimeters. Pointer multimeter is a multi-functional measurement instrument with a head as the core component, and the measurement value is read by the pointer of the head. Digital multimeter measurement value by the liquid crystal display directly in the form of digital display, easy to read, some also with voice prompts. Multimeter is a common head, set of voltmeter, ammeter and ohmmeter in one instrument.

Multimeter DC current gear is a multi-range DC voltmeter. Its voltage range can be extended by connecting a closed-circuit voltage divider resistor in parallel with the meter head. The DC voltage range of the multimeter is a multi-range DC voltmeter. The voltage range of the multimeter can be enlarged by connecting a voltage divider resistor in series with the head of the meter. Different voltage divider resistors have different ranges. The head of the multimeter is a magneto-electric measuring mechanism, which can only pass DC, and uses a diode to change AC to DC, thus realising the measurement of AC.