Test Method of Digital Controllers and Recorders
Digital controllers and recorders are quite common in industrial measuring industry. They are used for detecting, measuring, observing, calculating, displaying or recording various physical quantities, components, physical parameters and so on.
To test if they are qualified, there are generally five methods as following:
We may encounter that the digital controllers and recorders generally run well but run bad sometimes. Most of this phenomenon is caused by poor contact or virtual welding. In this case, percussion and pressing by hand can be used. The percussion is to lightly knock the plug-in board or component through a small rubber cockroach or other object to see if this will cause an error or downtime. The pressing by hand means that when a fault occurs, after cutting off the power supply, the plugged parts, plugs and sockets are pressed firmly by hand, restart to try whether the fault will be eliminated.
Observe, smell and touch. Sometimes, damaged components will discolor, blister or have burnt spots; burnt components will produce some special odor; short circuited chips will become hot; virtual soldering or desoldering can also be observed with the naked eye.
5. Contrast method
It is required to have two instruments of the same model, and one of them is in normal operation. Some necessary equipment are required, such as a multimeter, oscilloscope... According to the nature of comparison, there are voltage comparison, waveform comparison, output result comparison, current comparison and so on.
We provide various digital controllers and recorders matched for our pressure sensors and flow meters, offering good accuracy and stability. For any problems found in the use of them, you can contact our engineers for professional suggestions and instruction.