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Your location: Home > Related Articles > interprets the steps to solve the digital display dynamometer signal interference problem –

interprets the steps to solve the digital display dynamometer signal interference problem –

Author:QINSUN Released in:2023-05 Click:99

As a force measuring instrument that we often use in our daily life, the digital display dynamometer is preferred by users for its small size, light weight, easy to carry, controllable testing process and traceable and its high accuracy. , because this model is equipped with signal detection, its display instrument will sometimes be disturbed. Today we mainly talk about how to fix the digital display dynamometer signal interference problem.

1) Twisting of the line: for the electromagnetic induction, it is necessary to move away from the strong current equipment and the electrical network as much as possible, to adjust the direction of the line and to reduce the surface of the loop of wire, and only adjust the direction of the line, and the two signal lines are twisted at a short pitch, and the interference voltage can be reduced to 1/10 ~ 1/100 of the original; for electrostatic induction,when the two signal lines are twisted as a twisted pair and both When the distance from the signal line to the source of interference is approximately equal (the wires are often twisted in a pitch of 20 times diameter), the area surrounded by the signal loop can be greatly reduced and the electric field can cross the inductive coupling on both signal lines. The potential difference of serial mode interference entering the loop is greatly reduced.

2) Shield: In order to further prevent the interference of the electric field, a layer of insulation or signal line is wound on the outside, and the shield cable is directly used, and the shield layer is grounded, because the non-magnetic shield layer has no effect on the 50Hz magnetic field, if necessary, the signal wire can be threaded into the iron pipe, so that the signal wire canbe magnetically shielded, and after electrostatic shielding, the induced potential can be reduced to 1/100~1/1000 of the original.

3) Filtering: For DC signals that change very slowly, a filter circuit is added to the instrument input of the digital display dynamometer to minimize interference mixed with the actual signal, often before the input Add two to three stages of R-C filter circuitry and use a double-T filter with lower internal resistance for best results.

4) Cancellation: Digital instruments such as double integral type and pulse width modulation type perform A/D conversion on the average value of the input signal instead of the instantaneous value, which can average some interference in serial mode.

5) Try to separate the signal line from the power line: under the permitted conditions, the current flow of the wire isinverted to weaken the magnetic field interference generated by each other; it is not allowed to separate the signal line from the power line. The threads are laid together in parallel and must not enter the instrument through the same thread hole. The low-level signal line should be connected to the adjacent position of the signal terminal with the shortest possible untwisted line to reduce the inductive interference area. It is forbidden to use the same cable for the power line and the signal line, and the high-level and low-level lines must also be connected to each other. Do not use the same wiring plug. When necessary, separate the high and low level wires and place them next to the connector, separated by a ground terminal and a spare terminal.

6) If the test shows the transmitter and receiver are normal: You can check other components such as batteries.eries and antennas to see if there are any problems. The signal is unstable. Also, the signal may be unstable if the distance is too long or the battery voltage is insufficient.

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