Universal meters, also known as reuse tables, multi -purpose meters, three -usage tables, complex tables, etc., are indispensable measuring instruments for power electronics and other departments. Generally, the main purpose is to measure voltage, current, and resistance.The universal table is divided into pointer universal tables and digital universal meters in the display mode.It is a multi -functional and multi -range measuring instrument. Generally, universal meters can measure DC current, DC voltage, AC current, AC voltage, resistance and audio levels.Some parameters (such as β).
Digital multimeter
Digital multimeter, a multi -purpose electronic measuring instrument, generally includes the functions of ampere meter, voltage meter, ohm meter, and sometimes called universal measurement, multi -purpose measurement, multi -purpose meter, or triple meter.I. Working principle Universal meter measurement voltage, current, and resistance function are implemented by the conversion circuit part, and the measurement of current and resistance is based on voltage -based measurement, that is, digital multimeter is expanded on the basis of digital DC voltage tables.of.The converter converts the continuously changing simulation voltage voltage to the digital amount, and then counts the measurement results by the electronic counter to count the measurement results, and then the measurement results are displayed by the decoded display circuit.The coordination of the logical control circuit control circuit is completed in order under the action of the clock.2. Before using it, you should carefully read the relevant instructions of the relevant usage, and be familiar with the role of power switch, range switch, jack, and special sockets.⑴ Place the ON/OFF switch to the ON position and check the 9V battery. If the battery voltage is insufficient, it will be displayed on the display. At this time, the battery needs to be replaced.If the display does not display, follow the steps below.边 Test the symbol next to the pens jack, indicating that the input voltage or current should not exceed the indication value. This is to protect the internal line from damage.
Universal watch brand
Universal watch test current
1. Selected range: The DC current file of the universal meter is marked with "MA" with 1MA, 1OMA, and 100MA three -gear.Select the range, according to the current in the circuit.If you do not know the current, the maximum range should be selected.2. Measurement method: The universal table should be connected in series with the measured circuit.After the circuit should be disconnected, the multimeter is connected to both ends of the breakpoint.The red table pen should be connected to the breakpoint connected to the positive electrode of the power supply, and the black watch pens are connected to the breakpoint connected to the negative electrode of the power supply.(1) Connect the circuit so that the light emitting diode is glowing normally.(2) Prepare the multimeter according to the requirements of the previous use and place the switch at the MA file 100mA.(3) Disgle the in retirement point and luminous diode negative inter -leading lead to form a "breakpoint".At this time, the light emitting diode was extinguished.
How to use the multimeter
1. Measurement voltage: When measuring voltage (or current), choose a good range. If a small range is used to measure the large voltage, there will be a risk of burning the meter; if a large voltage is used to measure the small voltage, then the pointer is too small and cannot be too small to not be too small.reading.The choice of a range should be as much as possible to turn the pointer to about 2/3 of the full scale.If the size of the voltage measurement is not clear in advance, choose the highest range gear first, and then gradually decrease to the appropriate range.A. Measurement of AC voltage: Place one conversion switch of the multimeter in the interchange and DC voltage transmission, and the other conversion switch is placed on the appropriate range of the AC voltage.B. Measurement of DC voltage: Place one conversion switch of the multimeter at interchange and DC voltage transmission, and the other conversion switch is placed on the appropriate range of DC voltage, and the "+" table pen (red table pen) is received at the high power level. "-"The pen (black table pen) receives a low potential, that is, the current flows in from the"+"table pen, and flows out of the"-"table pen.If the pens are connected, the head pointer will rotate in the opposite direction, and it is easy to hit the pointer.

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