Recording circuit board resistance with a multimeter

When maintaining electronic circuits, it is sometimes necessary to measure the on-off of circuits, such as fuses, PCB copper foil wiring, and the connection relationship with the chip and its peripheral components, which requires the use of a multimeter, especially on unfamiliar and highly integrated circuit boards, it is very convenient to use a multimeter to measure the relationship between each component. Digital multimeters have a diode buzzer on them,how to test pcb board with a multimeter? which is very helpful in measuring the on-off of a circuit. Let's talk about this topic today.

Diode buzzer on the multimeter

In the digital use of the multimeter to choose on such a different gear called diode buzzer gear, it can be analyzed through to these diodes on and off the test, this gear can be based on the test as well as the diode on and off when the value of the display. We hit the gear to the diode beeping gear, when the red pen and the diode's positive pole began to contact, the black pen and the diode's negative pole in direct contact, at this time the use of the multimeter should be studied whether the diode should be displayed is the diode's positive conduction voltage drop, at this point in time the display of numerical methods should be in the 696, the following chart data shows. This 696 digital technology does not represent the diode resistance value, it is only to illustrate the diode measured in China this forward voltage drop of about 6.9V or so, it is the material is silicon material. If the measured diode is made of germanium, the value to be displayed should be about 247, because the forward voltage drop of the diode made of germanium is about 0.2V.

When the pen is switched and the measurement is taken, "1" should appear on the far left of the digital multimeter display, indicating that the diode's reverse resistance is infinite. When we measure whether a circuit is open or not, we often use a diode buzzer for convenience. When the resistance between two points is less than 90 ohms to 50 ohms, the buzzer will emit a long sound, which means that the circuit is open, pcblink 1oz vs 2oz Copper and this gear is not usually used to measure resistance.

Recording circuit board resistance with a multimeter

When measuring resistance with a multimeter a resistance file must be used, and care should be taken not to measure resistance while electrically charged, and to zero the ohms of the multimeter if it is a pointer multimeter measurement. In circuit board resistance measurement, in order to avoid the introduction of other branches of resistance, resulting in large measurement errors, we first remove the resistance of one end, and then measure.

circuit board resistance multimeter

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