原文链接： How to find the primary and the secundary coils of a FlyBack transformer

1) How to find the 0 V pin connection of the secundary coil ?
怎样找出次级的0 V引脚？

With a common digital ohmeter it is impossible to find the secundary coil pinout because its resistance is much too high. The main HV output is simple to find : this is the big red cable with the suction cup, but you need to find the 0 V pin of the secundary coil on the flyback transformer. So, I give you a simple method to find this 0v pin :
因为次级的电阻过大，故一般的数字欧姆表无法找出次级的引脚（注：似乎看到有人用机械表量，机械表里有个15V的电池。）。高压（HV）输出很容易找出来，就是最粗的带着一个皮碗的那根红色线，但是你需要找出高压包次级的0V引脚。 在这里，我给出一个简单的方法：

a) You need a 24 V DC power supply and a digital voltmeter set in 20 V range. Connect the + input of your voltmeter to the THT ouput plug ( in the suction cup ) and the (-) to the 0V of your power supply. Then, with the +24V output from your power supply, test each pin of your flyback transformer. When you measure a voltage between 5 and 10 V you have found the 0 V pin of your secundary coil. This is very simple... Look at the diagram and the photo below :
a) 你需要一个24V的直流电源，并且将你的数字表切换到20档，将红表笔连接到高压输出上，黑表笔接在电源负极上。接着将24V输出接在高压包的各个引脚上，当某个引脚测的电压是在5到10伏之间时，它就是0V引脚了。


2) How to find the pins location of the primary coil ?
怎样找出初级线圈的引脚？

With a simple ohmeter this is very simple, you will find easily the primary inputs because the coil resistance is about 1 ohm (see below).
只需要一个简单的欧姆表和简单的操作，你可以非常容易找到初级线圈的引脚，因为它们的线圈电阻大概在1欧姆左右。


3) How to find the polarity of the primary coil ?
怎么确定初级线圈的极性？

The purpose is to find the polarity of your primary coil. You need a simple 9 V battery. Connect a digital voltmeter set in 100 V range between the main THT output and the 0 V pin of the secundary that you have indentified in test #1. With the 9 V battery send a short pulse on the primary input, measure the spike of the voltage, then reverse the polarity of your 9 V battery. When you get the max voltage ( about a 30 V spike ) you have found the correct polarity of your primary coil. The (+) is the pin number 2 and the (-) is the pin number 1 in the main diagram of the Lab HV-PS.
要找出你手上高压包初级的极性，你需要一个9V的电池，将数字表的量程选择在100V档，并把表笔接在在1）中找到的高压输出与0V之间。从初级引出两根线，试触9V的正负极，测量火花电压（没火花……或者叫瞬时电压），接着将正负极互换，两次中你获得最高电压（瞬间电压大概在30V左右）的就是正确的极性。