The term SCR stands for Silicon Controlled Rectifier. These three terminal devices can be tested by a number of different methods. The more common methods utilize a DVM (Digital Volt Meter) or an Analog Meter. Usually the SCR is tested by simply looking for the lack of conduction between Anode and Cathode leads. A high resistance would indicate a functional device, given the limitations of not gating the device.
Another method that is used in some Repair Centers involves a Test lamp, a battery and a few Test leads. The lamp and battery are connected in Series then placed across the SCR's Anode and Cathode leads (the negative lead of the battery connects to the SCR's Cathode lead). A flying test lead is then used to trigger the SCR by momentarily connecting the positive terminal of the battery to the SCR's gate lead.
18 Volt Batteries
Both of these Test methods can provide an indication of device functionality when no other methods are available. Unfortunately, both methods require the Technician to consult a Datasheet or Service Manual prior to Testing the SCR. This ensures correct lead configuration. If the device pinout can not be determined, then the whole Test process becomes little more than a guess, or a hit-and-miss operation.
Failure analysis or Functional Test of the SCR should always be performed when the device is out of circuit. This means that the component should not be electrically connected to anything other than the Test Equipment that is used to evaluate the devices functionality.
At a well equipped Repair Center, SCR's are tested utilizing an SCR Component Analyzer. This equipment confirms the SCR's functionality, by gating the device and intelligently measuring its device characteristics. Confirm that the device tests as follows:
Press the Red Test Button to turn the Component Analyzer on. The Blue Result LED will light. Attach the Test Leads to the SCR's Gate, Cathode and Anode Terminals. It is not important which leads go where. The Component Analyzer will determine the connection details.
Press the Red Test Button. The first three LED's will display the connection details for a functional device. The Result LED will display the Test result. A Blue LED means that the device has an open circuit condition. A Red LED means that the device is shorted. A Green LED means that the device is Functional.
High Protien Diet Muscle Protein Shakes Kolcraft Stroller Parts