The main points when the radar level meter overhaul are when overhauling the internal circuit of the radar level meter, if the installation components and the contacts of the circuit board are coated with insulating paint, when measuring the parameters of each point, you can weld an ordinary hand sewing needle for testing with a multimeter pen in order to pierce the paint layer and measure each point directly, rather than stripping the paint on a large area; when repairing the radar level meter failure in a humid environment, you need to use a multimeter to test Printed circuit points are smooth, because the main fault, in this case, is copper foil corrosion; Do not plug and unplug various control boards and plugs with electricity
Because in the case of power, plugging and unplugging the control board will produce a very strong induction electromotive force. At this time, the instantaneous rebound voltage is very high, it is easy to damage the corresponding control board and plug; test the filter capacitor in the power supply, should first short the positive and negative electrolytic capacitor, a short circuit can not be used to test the lead instead of the capacitor discharge wire because it is easy to burn the core wire.
You can take a 220V, 60-100W lamp with a light head lead, connected to the two ends of the capacitor, the moment of discharge the bulb will flash; the radar level meter needs to be disassembled on site, or adjust the internal parameters need to record the original position or original parameters to restore the original state; when using a logic pen, oscilloscope, etc. to detect the radar level meter signal, take care not to let the probe touch the two measuring pins at the same time, because this The nature of the situation is to form a short circuit during detection. The power is turned on.