Oscilloscope Introduction
Oscilloscope Introduction BW(Bandwidth) on oscilloscope 示波器所需带宽=被测信号的最高频率成分*5 带宽： 示波器模拟前端的模拟带宽，它的大小直接决定了对信号测量能力的高低，示波器测得正弦波的幅度，不低于真实正弦波信号 3dB幅度时的最高频率，也称-3dB 截止频率点，随着信号频率增加，示波器对信号的准确显示能力都会下降。
Industrial Control Repair
Circuit Symbol Learning
Circuit Symbol Learning 1.mosfet 2. IGBT (Insulated Gate Bipolar Transistor ) Real Item: 3. Inductor 4. NPN Audion 5. PNP Audion 6. OptoCoupler
Professional Maintaince Tool List
DC Source DC 源迈胜 MP5005D Repairing Power Device 固纬电源SPD-3606 Expensive 求精QJ-3005S可调稳压电源 A little bit Expensive 龙威可调稳压电源 Cost Performance Multimeter FLUKE 289C Expensive FLUKE 179C A Little Bit Expensive 优利德UT61E+ Cost Performance oscilloscope FLUKE 199C Expensive 普源DS1102 迷你示波器 A Little Bit Expensive 迷你示波器 Cost Performance IN CIRCUIT TESTER HUNTRON 2800S Expensive ProbeASA-III A little Expensive Cost …
How to test optical coupler
How to test optical coupler Testing Tool 1. Pointer device 2. DC Source 3. Multimeter 4. Soldering iron optical coupler Type 8PIN like PC923, A7800 optical coupler 8pin Testing method 1) Supply 15V into 8 pin(VCC) 7PIN(gND) of PC923 You need to weld 2 wires into 7, 8 pin so that you can supply power …
How to Test Capacitor or inductance
How to Test Capacitor or inductance Testing Tool LQ-9101 can be used to test Capacitor and Inductance,Resistance. Please note that 1) Industrial Frequency Transformer can’t be tested via LQ-9101, which should be suitable for high frequency device. 2) LQ-9101 ONLY can test Electrolytic capacitor , other kind of capacitors can’t be tested. LQ-9101 produce AC …