1. The data can be queried in multiple directions, so that managers can clearly grasp the development trend of quality control. In order to be able to better understand the parameters and status of key points in the application of test materials, software developers have specially designed a set of software that can accurately carry out process adjustment and production control. When using a logic pen or an oscilloscope to detect signals, be careful not to allow the probe to contact the two measurement pins at the same time, because the essence of this situation is to form a short circuit under power-on.
2. When using a multimeter ohm block, remember not to measure with electricity.
3. When detecting the filter capacitor in the power supply, you should short-circuit the positive and negative electrodes of the electrolytic capacitor first, and do not use a test lead wire to replace the wire to discharge the capacitor when the short-circuit, because it is easy to burn the core wire. You can take a 220V, 60 ~ 100W lamp with a lead wire connected to the two ends of the capacitor, the bulb will flash at the moment of discharge.
4. When repairing the internal circuit of the instrument, if the contact of the installed component and the circuit board are coated with insulating varnish, when measuring the parameters of each point, you can use a common hand stitch to weld the probe of the multimeter to pierce the paint layer to directly measure each point, and There is no need to strip the paint layer over a large area.
5. When repairing instrument faults in a humid environment, it is necessary for the printed circuit to test whether all points are smooth with a multimeter, because the main fault in this case is corrosion of copper foil.
6. Don't blindly knock and bump during maintenance, so as not to expand the fault, the worse the repair.
7. Do not plug and unplug all kinds of control boards and plugs with power on. Because in the case of power-on, the insertion and removal of the control board will generate a strong induced electromotive force, then the instantaneous counter-voltage is very high, and it is easy to damage the corresponding control board and plug.
8. When disassembling and adjusting the meter, the original position should be recorded for recovery.
9. When repairing precision instruments and meters, if you accidentally flick small parts, you should first determine the possible flying place, do not look east, turn west, you can use magnet scanning and line of sight scanning method to find.
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