The electronic platform scale is a kind of precision electronic instrument, which is easy to operate, high precision and practical, but it is slightly more expensive than the traditional mechanical scale. Today, we will teach you a method of making digital display scales. Of course, this is just the method of making ordinary electronic scales. The true electronic scales are more accurate than this, and the stability is much better. The cost is also higher than this. It is much more expensive. Friends who like hands-on can try, Zui key is to do it yourself is cheaper. Of course, before you start doing it, you still need to know some knowledge about the structure and working principle of the electronic station. Let's take a look at the specific method.
First, the component selection 1. IC1 selects ICL7126 integrated block; IC2, IC3 selects high precision low temperature standard precision op amp OP-07; IC4 selects LM385-1.2V integrated block.
2. The sensor RI uses E350-ZAA foil type resistance strain gauge, and its normal resistance is 350O.
3. Precision metal film resistors should be used for each resistor element.
4. RPI uses precision multi-turn potentiometers. RP2 and RP3 can be replaced by precision metal film resistors after debugging.
5. In the capacitor, C1 uses a mica capacitor or a ceramic capacitor.
Second, the electronic platform scale production and debugging deformation steel can be made with ordinary steel saw blade, the method is: first smooth the serrated, then the saw blade is heated to reddish, hot processed into a "U" shape, and drilled in the corresponding position, For later installation. Then it is heated to orange-red (to get seven or eight hundred degrees Celsius), quickly released into cold water quenching to improve hardness and strength, after the surface treatment process. The scale hook can be glued to the bottom of the steel with super glue. The strain gauges are bonded to the large part of the steel part deformation (inside the middle) with a special strain adhesive. At this time, the change in force is just the opposite of the change in resistance. The æ‹Ž ring application activity chain is connected to the scale body so that the scale body can hang freely when in use, and the æ‹Ž ring should also be hooked on the same vertical line as the scale.
During the commissioning process, 1 kg and 2 kg standard weights should be prepared. The process is as follows:
1. First, adjust the RP1 when the scale body naturally hangs without load, so that the display accurately displays zero.
2. Then adjust RP2 to make the scale body bear the full scale weight (this circuit selects the full range of 2 kg) to display the full scale value.
3. Then hang the 1kg standard weight under the scale hook to see if the display shows 1.000. If there is any deviation, adjust the RP3 value to make it accurately display 1.000.
4. Repeat steps 2 and 3 to make them meet the requirements.
5. After zui, the resistance values ​​of RP2 and RP3 are accurately measured and replaced with fixed precision resistors.
6, RP1 can lead to off-balance sheet adjustment. Adjust RP1 before measuring to return the display to zero.
Is it amazing? It turns out that you can also make a simple weighing scale.
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