Now the use of digital multimeters is not universal, but the precautions for the use of pointer multimeters are also his advantages, such as cheaper prices, better features during maintenance, etc. So here to introduce his use.
Precautions for the use of the pointer multimeter
(1) Before using the multimeter, perform “mechanical zeroingâ€, that is, when there is no measured power, the multimeter pointer points to the zero voltage or zero current position.
(2) In the process of using the multimeter, the metal part of the test pen cannot be touched by hand, so that the measurement can be ensured on the one hand, and the personal safety can be ensured on the other hand.
(3) When measuring a certain amount of electricity, it is not possible to shift gears while measuring, especially when measuring high voltage or large current. Otherwise, the multimeter will be destroyed. If you need to change gears, you should first disconnect the test leads and then change the gears before measuring.
(4) When the multimeter is used, it must be placed horizontally to avoid errors. At the same time, we must also pay attention to avoiding the influence of external magnetic field on the multimeter.
(5) When the multimeter is used, the switch should be placed at the maximum of the AC voltage. If it is not used for a long time, the battery inside the multimeter should be taken out to prevent the battery from corroding other devices in the watch.
Use of ohms
First, choose the appropriate magnification. When measuring resistance on an ohmmeter, select the appropriate magnification so that the pointer is near the median. It is best not to use the left third of the scale, which is very dense.
Second, you must zero before using.
Third, can not be powered measurements.
4. The measured resistance cannot have a parallel branch.
5. When measuring the equivalent resistance of polar components such as transistors and electrolytic capacitors, you must pay attention to the polarity of the two pens.
6. When measuring the equivalent resistance of the nonlinear component with the ohmmeter of different multipliers of the multimeter, the measured resistance values ​​are different. This is caused by the difference in the median resistance and the full-scale current of each gear. In the mechanical watch, the smaller the general magnification, the smaller the measured resistance.
Multimeter when measuring DC
First, carry out mechanical zero adjustment.
Second, choose the appropriate range gear.
Third, when the current meter is used to measure the current, the meter should be connected in series to the sub-test circuit, because only the serial connection is such that the current flowing through the ammeter is the same as the current of the measured branch. When measuring, the measured branch should be disconnected, and the multimeter red and black test leads should be connected between the two points where the quilt is disconnected. In particular, it should be noted that the current transcription can be connected to the sub-test circuit, which is very dangerous, and it is easy to burn the meter.
Fourth, pay attention to the polarity of the measured power.
Fifth, use the scale and read correctly.
6. When selecting a 2.5A block with DC current, the multimeter red test pen should be inserted in the 2.5A measurement jack, and the range switch can be placed on any range of the DC current block.
7. If the DC current measured by the submeter is greater than 2.5A, the 2.5A gear can be expanded to 5A gear. The method is very simple, the user can connect a 0.24 ohm resistor between the "2.5A" jack and the black test lead jack, so that the gear becomes a 5A current block. The 0.24A resistor connected should be selected with a wirewound resistor of 2W or more. If the power is too small, it will burn.
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