Instrument contrast method
The specific method is: let the faulty instrument and the normal instrument run in the same situation, and then detect the signals of some points and compare the two groups of signals measured, if there is different, it can determine that the fault is here. This method requires the maintenance personnel to have considerable knowledge and skills.
Two meters of the same type are required, and one is in normal operation. Use this method also have necessary equipment, for example, multimeter, oscilloscope and so on. According to the nature of comparison, voltage comparison, waveform comparison, static impedance comparison, output results comparison, current comparison and so on.
Capacitive bypass method for instrumentation
When something strange happens to a circuit, such as a jumbled display, capacitive bypass can be used to identify roughly what part of the circuit is failing.
Instrument isolation method
The fault isolation method does not require the same type of equipment or spare parts for comparison, and is safe and reliable. According to the fault detection flow chart, the fault search area is gradually reduced by dividing and surrounding, and then combined with signal comparison, component exchange and other methods, the fault will be found quickly.
Instrument percussion method
We often encounter the phenomenon of good and bad operation of the instrument, which is mostly caused by poor contact or virtual welding. In this case, percussion and hand pressure can be used.
Instrument condition adjustment method
In general, before the fault is not determined, do not casually touch the components of the circuit, especially adjustable devices, such as potentiometers. However, if the paperless recorder takes multiple reference measures in advance (for example, make a good position mark or measure the voltage or resistance value before touching), it is allowed to touch if necessary. Maybe the changes will sometimes eliminate the glitches.
IC power supply and ground terminal; The transistor circuit is connected to the base input or collector output to observe the effect on the fault phenomenon. If the color paperless recorder capacitor bypass input invalid and bypass its output when the fault phenomenon disappeared, then determine the fault appears in this level of circuit.
180-5173-0171
Room 801-A, 8th Floor, Liancai Center Building, No. 18, Chunxu Road, Kunshan Economic Development Zone, Jiangsu Province
www.bonneville-cleantech.com
Sweep yards attention