Multimeter-capacitance testing skills
Before connecting the capacitor to be tested, pay attention to the fact that it takes time to reset when changing the range each time, and the existence of drift readings will not affect the test accuracy.
1. Set the function switch to the capacitance range C (F)
2. Insert the capacitor into the capacitance test socket
Notice:
⒈The instrument itself has set protection for the capacitance file, so there is no need to consider the polarity and the charging and discharging of the capacitance during the capacitance test.
2. When measuring capacitance, insert the capacitor into the dedicated capacitance test socket.
⒊It takes a certain amount of time to stabilize the reading when measuring large capacitance.
4. Capacitance unit conversion: 1μF=106pFlμF=103nF
Continuity test
1. Insert the black test lead into the COM jack, and the red test lead into the V/Ω jack (the polarity of the red test lead is "+"). Set the function switch to the "what" position, and connect the test lead to the diode to be tested, and the reading is the positive value of the diode. Approximate value for pressure drop.
2. Connect the test leads to the two ends of the line to be tested. If the resistance between the two ends is lower than about 70Ω, the built-in buzzer will sound.
resistance file;
One of the methods that can be used to judge the quality of resistors, diodes, and triodes. When the actual resistance value of the resistor deviates too much from the nominal value, it is damaged. For the two-transistor, if the resistance between any two pins is not very large (above hundreds of K), it can be considered that the performance has declined or has been damaged by breakdown. Note that this triode is not blocked. This method can also be used for integrated blocks. It should be noted that: the measurement of integrated blocks can only be compared with the normal parameters.
The test leads of ordinary multimeters have relatively large resistance, and interested enthusiasts can make a pair of test leads by themselves; method: prepare high-quality speaker wires or multi-core copper wires about one meter long, and a pair of clips with insulating sleeves (red and black) , a pair of banana plugs (red and black) for speaker wiring; one end of the line is welded firmly on the clip, and the other end is connected to the banana plug; a pair of good test leads is done.
