Instrumentation overhaul method - Delixi

Create Date: 2024-8-30 12:03:23|Source: Delixi

Contrasting method

The specific method is to let the problematic meter and the normal meter operate under the same conditions, and then detect the signals at some points and compare the two sets of signals measured, if there are differences, you can conclude that the fault is here. This method requires considerable knowledge and skill on the part of the maintenance personnel.

Two meters of the same model are required, and one of them is in normal operation. It is also necessary to have the necessary equipment to use this method, such as a multimeter, oscilloscope, etc. According to the nature of the comparison, there are voltage comparison, waveform comparison, static impedance comparison, output result comparison, current comparison, etc.

                                     Instrumentation overhaul method - Delixi

Capacitor bypass method

When a certain circuit produces a strange phenomenon, such as a chaotic display, the capacitive bypass method can be used to determine the part of the circuit that is likely to be faulty.

Segregation Law

The fault isolation method does not require comparison of the same model of equipment or spare parts, and is safe and reliable. According to the fault detection flow chart, the segmentation and enveloping gradually narrows the scope of fault search, and then cooperates with signal comparison, component exchange and other methods, and the fault will generally be found quickly.

Percussion

It is common to encounter the phenomenon that the instrument is running well and badly, and most of this phenomenon is caused by poor contact or virtual soldering. In this case, percussion and hand pressure can be used.

State adjustment method

Generally speaking, before the fault is determined, do not touch the components in the circuit, especially adjustable devices, such as potentiometers. However, if the paperless recorder takes a cross-reference measure in advance (e.g., marking the position or measuring the voltage or resistance value before it is touched), it is still allowed to be touched if necessary. Maybe after the change, sometimes the fault will be eliminated.

IC power supply and ground terminal; The transistor circuit is crossed at the base input or collector output to observe the effect on the fault phenomenon. If the capacitive bypass input of the color paperless recorder is invalid and the fault disappears when the output is bypassed, the fault is determined to be in this stage of the circuit.

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