The transformer has 12 pins, 6 on each side, how to measure

1) Use a multimeter.

X1 (x10, x100) test the connection to see which two pins are in a group and which pins are connected.

2) The lowest pin-to-pin resistance is a group. Retest the tap.

3) Re-measure the phase, polarity, see what the nominal input voltage is, energize, measure the output, and record.

4) Then connect the independent windings that are not connected to the two ends arbitrarily, measure the voltage, and then connect the terminals to measure the voltage at the other two ends, which is equal to the sum of the two independent voltages in series, and the difference between the two independent voltages is inverting series, so that the polarity can be judged.

A transformer is a device that uses the principle of electromagnetic induction to change the alternating voltage, and the main components are the primary coil, the secondary coil and the iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance.

Conversion, isolation, voltage regulation (magnetic saturation transformer), etc. According to the use, it can be divided into: power transformer.

and special transformers (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mine transformer, audio transformer, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor.

transformers, etc.). Circuit symbols often start with t. Example: T01, T201, etc.

The measurement method of the transformer is not indicated.

1.Another method is to measure the inductance with an inductance meter to find out the corresponding number of groups.

2.The maximum inductance is used to calculate how many volts the input voltage is. (To calculate the inductive reactance XL 2 FL, the approximate transformer power needs to be judged).

3.Energize the voltage and mark each group of voltages.

Eight-pin small circuit board power isolation transformer.

Here's how it usually looks:

1. Two primary power supply feet, with specialization.

The multimeter measures it, and the voltage is 220V.

The resistance value of the genus input is generally about 400, and the resistance of the coil should be above 1000r for 380V power input.

2. The remaining six pins are two sets of independent output power supplies with intermediate taps, which can be judged according to the coil resistance measured by the multimeter;

If your transformer is divided into two pins, four pins each, it should be 12 power supplies; 348 is a group of outputs, 8 is the middle tap; 567 is a set of outputs, and 6 is the middle tap.

If it is used for other purposes, it may be different.

The above is a personal opinion only

The CPKF Sutra introduces the details of the transformer in great detail

These are some of the most commonly used identification methods for 8-pin transformers for small circuit boards. You can refer to it

According to the principle of the transformer, use a multimeter to measure, record the value of each measurement, and then reason. And it came out

This should be a dual power output transformer.

Two of the five pins are primary windings with an input AC of 220V.

There are 3 bit pins remaining, two of which will be connected to the rectifier bridge (or rectifier diode) on the board, the rectifier output positive and the remaining pins form a positive supply, and the rectifier output negative and the remaining pins form a negative supply.

Don't look at the recommended answer, this is a switching power supply, just look at the thickness of the line, the primary is thin, the secondary is thick, if it is the same, you don't know, but it must not be connected to 220V! This is a high-frequency transformer! It is used in switching power supplies.

This could be a switching power transformer. High-frequency stuff.

It seems to be a switching transformer, and it makes no sense to measure the voltage.

Transformers are not wearing parts and are rarely damaged.

Amateur measurement is to measure the on-off and insulation of the winding, and the inductance can be measured if possible.

There are many transformer pins, some of which are empty and are not necessarily used.

Usually, as long as each winding is on, and the windings are insulated between the windings and to the ground, there is generally no major problem.

Take a picture of your circuit board as a whole**, by the way, tell me what model the chip that drives the switch tube, and I'll tell you how to repair this thing......

This 90% will not be a problem, you still check the other relevant parts.

This is basically not a problem, and it is mostly caused by damage to the switch tube or rectifier damage.

The transformer won't break, and it doesn't matter how many feet there are, you have to see that there are no wires on its feet, and some of the feet are empty.

Different switching transformers have different principles, working conditions, design and manufacturing--- with different pins and different layouts.

Without seeing what circuit the transformer was originally used for, it is impossible to know what it is used for and what each foot does. If you take an off-the-shelf similar transformer for your own circuit, most of them are not suitable. It is advisable to dismantle the original winding and then redesign the winding according to your own needs.

Here's a guess: this is a flyback switching transformer for switching power supplies, two of the six pins are primary windings, two of the other four are secondary windings (output windings), and the other two are feedback windings.

If you guess wrong, it's a joke.

The transformer principle is to generate magnetism and regenerate electricity, and the voltage is changed by changing the ratio of turns on both sides.

You understand this 6-pin as 220V to 100V and 50V, and the specific values are shown in the label.

From your diagram, that's because there are 2 windings (4 heads) on the secondary side, plus one winding (2 heads) on the primary side, for a total of 6 heads.

The transformer can not only have only one secondary winding, according to the different requirements of the load power supply voltage, it can be used to wind multiple windings in parallel or tap out of the middle of the winding to form a secondary winding, there is no need for a device, because the power supply voltage level is different, several transformers are used, not to mention the large volume, the key is not economical.

That's because the components on the board require different voltages.

So you can use a few different voltages.

Generally, the foot position on the customer's drawings shall prevail.

1. Usually the foot position corresponding to the bump or hypotenuse is pin1, and then the other foot positions are defined in a clockwise direction, as shown in the figure below with the hypotenuse corresponding to pin1:

2. Some special-shaped skeletons: such as RM type, must have been subject to the customer's drawings.

Test procedure.

The low-voltage DC power supply is connected to the AB, BC and AC of the high-voltage coil in turn, and the indication direction and the maximum value of the swing are measured with a DC instrument on the low-voltage side each time, so that a total of nine times are carried out and nine values and directions are recorded.

The polarity of the battery and the DC instrument should correspond during the test, for example, A on the high voltage side should be connected to the positive pole of the battery, B should be connected to the negative pole of the battery, then A on the low voltage side should also be connected to the positive pole of the DC instrument, B should be connected to the negative pole of the DC instrument, and other phases should also correspond to each other. Every time the high-voltage side is connected to the battery, observe the indication direction and value of the DC instrument on the low-voltage side, and record the number of "ten" for those who swing in the positive direction and "one" for those who swing in the negative direction.

Analytical judgment. Based on the nine values recorded in the nine measurements, the first thing to determine is whether the transformer is singular or double. Where there are three decimal places and six large numbers in the nine absolute values are singular groups, if there are six decimal places and three large numbers, it is a double number group, when the judgment result is a singular group, the smallest number of them can be zero, and then the nine numbers are arranged according to the measurement order, and the junction group of the transformer can be determined by comparing the rules of various groups in Table 1. The "ten" in the table represents a positive number, the "one" represents a negative number, and zero represents the smallest number measured.

The transformer wiring method is generally 11 o'clock and 12 o'clock wiring mode, and the tester should understand and memorize the polarity table of these two wiring methods.

The primary is connected to a light-emitting diode, the secondary is connected to a small battery, the LED is on when the battery is turned on, and the positive end of the battery is the same name as the end of the LED cathode. When the battery is disconnected, the LED is on, and the negative end of the battery is the same name as the positive end of the LED.