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Nine major precautions for overhauling instruments
Author:admin    Released in:2019-03-09 09:50:13    Written words:【Big】【In the】【Small
Abstract:When using the multimeter ohms, remember not to measure with electricity.

1. When using the multimeter ohms, remember not to measure with electricity.

2. When using the logic pen and oscilloscope to detect signals, be careful not to make the probe touch the two measurement pins at the same time, because the essence of this situation is to form a short circuit under power-on.

3. When detecting the filter capacitor in the power supply, first short-circuit the positive and negative poles of the electrolytic capacitor, and do not use the test lead wire instead of the wire to discharge the capacitor when short-circuiting, because it is easy to blow the core wire. You can take a 220V, 60 ~ 100W lamp with a lamp lead, connected to the two ends of the capacitor, the bulb will flash when the battery is discharged.

4. When repairing the instrument fault in a humid environment, it is necessary to measure the smoothness of each point on the printed circuit with a multimeter, because the main fault in this case is copper foil corrosion.

5. When inspecting the internal circuit of the instrument, if the contact points of the mounted components and the circuit board are coated with insulating varnish, the parameters of each point can be measured by ordinary hand stitching on the test chart of the multimeter, so as to pierce the paint layer and directly measure the points. It is not necessary to peel off the paint layer over a large area.

6. Do not plug and unplug various control boards and plugs. Because in the case of power-on, the plug-in control board will generate a strong induced electromotive force, and the instantaneous counter-attack voltage is very high, which easily damages the corresponding control board and plug.

7. Don't blindly knock and touch when you are overhauling, so as not to expand the fault, the more you repair it.

8. When disassembling and adjusting the instrument, the original position should be recorded for recovery.

9. When repairing precision instruments and meters, if you accidentally fly a small part, you should first judge the place where it may fly. Do not look east, turn it over, you can use magnet scanning and line-of-sight scanning method to find.


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