Now Shanghai Henggang's Xiaobian brings everyone together to know about electronic platform scales . The electronic platform scale has high precision and fast weighing speed. However, there are some minor problems with electronic scales that are used for a long time. Therefore, the following topic that Xiao Bian wants to talk about with everyone is: Analysis of electronic platform scale failure.
Electronic platform scale failure analysis:
First, the electronic platform scale weighing inaccurate fault analysis
Observe whether the internal code value is stable, whether there are frictional phenomena in various parts of the sensor, whether the stabilized power supply is stable, and whether the operational amplifier circuit is normal. Use weights to test if the balance of the four-foot scale of the weighing pan is average. According to the instruction manual, further instrument local analysis or weight correction.
Second, the failure to return to zero after the weighing is removed
Check whether the sensor output signal value is within the standard (A/D total amplifying code/inner code range/base code range). If the signal value is not within the standard, adjust the adjustable resistance of the sensor to adjust the signal value to the standard. If it is impossible to compensate, please check whether the sensor has any problem. If the sensor output is normal (the scale body is stable), then lock the instrument fault. Usually the amplifier circuit and A/D converter circuit have problems. Then judge the test and analysis according to the circuit principle one by one. Solve the problem.
Third, electronic scales can not boot failure
First determine the non-fuse, power switch, power line and voltage switching switch caused by the problem, check whether the transformer AC voltage input and AC output. If the meter has a battery, remove the battery and turn it on with AC power to see if it is caused by a low battery voltage. Secondly, check whether the rectifier circuit, voltage regulator circuit, and display driver circuit are abnormal. If there is no problem, check whether the processor and auxiliary circuit are burned out.
Fourth, display garbled
Remove the original display circuit and replace it with a normal display circuit to see if it is normal. If the normal display shows a problem with the display circuit, if it is abnormal, check whether the driver circuit is faulty. Check if the output pin of the processor is within a reasonable output range.
Fifth, the key is not good
Change the new button first to test, if the new button function is normal, then it can be judged as bad button contact, measure whether the line between the button and the CPU is open circuit, or false welding. Check the key support for poor contact. Measure whether there is a short circuit or open circuit between the button and the diodes and resistors on the CPU circuit.
Six, can not be called full load
This is similar to the case of non-zeroable, most of which may have changed due to the small signal input range. According to the method that cannot be returned to zero, if no problem can be found, first detect whether the power supply, A/D circuit is normal, and then detect the sensor output.
If you have any questions about electronic scales you want to know, you can call us. Xiaobian is here to thank everyone for their understanding and support.
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