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Industry Information
Common faults and diagnostic methods of instruments and meters (2)
2011-10-7 8:44:54

升降温法 Six , temperature rise and fall method

,仪表工作较长时间,或 在夏季工作环境温度较高 就会出现故障,关机检查正常,停一段时间再开机又正常,过一会儿又出现 故障。 Sometimes , the meter will work for a long time, or when the working environment temperature is high in summer , it will fail. The shutdown check is normal. After a period of time, it is normal to start the machine again. After a while, a failure occurs . IC 元器件性能差,高温特性参数达不到指标要求所致。 This phenomenon is due to the poor performance of individual ICs or components, and the high-temperature characteristic parameters fail to meet the specifications. In order to find the cause of the failure, the temperature rise and fall method can be used.

,用棉纤将无水酒精在可能出故障的部位抹擦,使其降温,观察故障是 不是 消除。 The so-called cooling down means that when the fault occurs , use cotton fiber to wipe anhydrous alcohol on the part where the fault may occur, so as to cool down, and observe whether the fault is eliminated. 所谓升温就是人为地将环境温度升高,比如用电烙铁放近有疑点的部位( 注意 千万 不可将温度升得太高以致损坏正常器件) 试看故障是 不是 出现。 The so-called temperature rise is to artificially increase the ambient temperature. For example, use an electric soldering iron to approach the suspected part (be careful not to raise the temperature too high to damage normal devices ) to see if the fault occurs.

骑肩法 Seven , shoulder riding

可以 并联法。 The shoulder riding method can also be called a parallel method. 接触不良等原因,则采用这种方法可以排除。 Install a good IC chip on the chip to be inspected, or connect a good component ( resistance capacitor, diode, triode, etc. ) in parallel with the component to be inspected to maintain good contact. If the fault is caused by an open circuit in the device or Causes such as poor contact can be ruled out using this method.

电容旁路法 Eight , capacitor bypass method

,例如显示器混乱 ,可以用电容旁路法确定大概出故障的电路部分。 When a circuit has a strange phenomenon , such as when the display is confused , you can use the capacitor bypass method to determine the part of the circuit that is probably faulty. 集电极输出端,观察对故障现象的影响。 Connect the capacitor across the power and ground terminals of the IC . For the transistor circuit across the base input or collector output, observe the effect on the fault phenomenon. 没有 果, 而旁路它的输出端时故障现象消失,则确定故障就出现在这一级电路中。 If the capacitor bypass input has no effect , and the fault disappears when the output is bypassed, it is determined that the fault appears in this stage of the circuit.

 

状态调整法 Nine , state adjustment method

没有 确定前,不要随便触动电路中的元器件,特别是可调整式器件是, 比如 电位器等。 In general, do not touch the components in the circuit before the fault is determined, especially the adjustable devices, such as potentiometers. 如,在未触动前先做好位置记号或 测出电压值或 电阻值等) ,必要时还是允许触动的。 However, if repeated reference measures are taken in advance ( such as making a position mark or measuring the voltage value or resistance value before touching it ) , it is still allowed to touch it if necessary. Maybe the fault will disappear after changing. 故障隔离法不需要相同型号的设备或 备件作比较,而且安全可靠。 Isolation method , fault isolation method does not require the same model of equipment or spare parts for comparison, and is safe and reliable. 然后 配合信号对比、部件交换等方法,一般会很快查到故障所在 的地方。 According to the fault detection flowchart, segmentation and enclosing gradually narrow down the fault search range, and then cooperate with methods such as signal comparison and component exchange to generally find out where the fault is .

The meter series sold by Jiangsu Dongxiang Meter are: flow meter series, temperature meter series, pressure meter series, calibration meter series , level meter series, digital display meter series, transmitter meter series, etc.