Cen Tech Digital Multimeter
How to Use a Cen-Tech Digital Multimeter
Cen-Tech manufactures numerous different digital multimeters, but you don’t need separate orders for each one. If you know how to use the cheap 98025 seven-function prototypical, you can use all the others. The seven functions refer to this model’s aptitude to measure AC and DC voltage, current and resistance, and its ability to test semiconductor diode, transistors and batteries.
Getting Ready to Use the Multimeter
Note the main selector controls on the front of the multimeter. Use this wheel to select the purpose you need and the understanding of the dimension you’re going to make. You’ll announcement three jack inputs organized in a vertical line on the bottom right. They are noticeable – from top to bottom – 10ADC, VΩmA and COM. The meter comes with a couples of leads, one black and one red, that fit into these knaves. On the left-hand side, you’ll see a multipin electronic transistor /hFE jack for testing junction transistor. You’ll also see an On/Off button. Turn this on to stimulate the LED display.
Measuring Voltage and Current of Cen Tech Digital Multimeter
To measure AC voltage, rotate the chooser to point to 750 in the AC voltage section (ACV) at the top. Plug the red lead into the jack noticeable VΩmA and the black lead hooked on the jack marked COM. Touch the principals to the exposed wires of the circuit you are challenging and note the interpretation. If it is less than 250 V’s, turn the chooser to the 250 setting in the AC voltage section to get a more precise reading.
To measure DC voltage, permission the red lead in the jack noticeable VΩmA and the black lead in the jack marked COM and turn the dial lefthanded to the 1000 setting in the DC voltage section (DCV). Take the interpretation by touching the leads to the unprotected circuit wires. If the interpretation is less than 200, move the dial to that setting. If the interpretation is less than 20, move the dial to that setting. Keep revolving the dial as needed, all the way to 200 mV if necessary, to get the most accurate reading.
Measuring Resistance and Continuity
When you measure resistance, the unit provisions a small current, so there must be no other current source. Check the tour with the voltage function to make sure the meter reads 0. Insert the bloodshot lead in the VΩmA jack and the black lead in COM. Turn on the multimeter and change the selector to the 200 location in the ohm (Ω) area. Before you take a dimension, touch the leads together and make unquestionable the meter reads 0, indicating there is no resistance between the leads. Touch the leads to the bare circuit wires and note the reading. If the interpretation is 1, turn the dial one position anticlockwise and try again. Keep turning the dial – all the technique to 2000k if essential – until you get a reading other than 1.
Testing Diodes, Batteries, and Junction transistor of Cen Tech Digital Multimeter
You can custom the multimeter to test the electrical energy drop across a diode so you can compare it to the diode’s conditions and determine whether it’s still good. Turn the dial to the diode segment, which is at the 6 o’clock location next to the lowest setting in the resistor section. Supplement the red lead into the VΩmA jack and the dark lead into COM. Turn on the rhythm. Touch the red lead to one incurable of the diode and the black lead to the supplementary and note the reading, which is displayed in mV. If the reading is 1, reverse the principals and try again.
You can examination 9V, D-cell, C-cell, AA and AAA batteries through this rhythm. Turn the dial to the cordless section at the top of the blackboard to the right of the ACV section. Put the red principal into the VΩmA jack and the other principal into the COM jack and turn on the rhythm. Touch the red lead to the optimistic terminal of the battery-operated and the black lead to the undesirable terminal and note the interpretation. Do not test 6V or 12V vehicle series with this purpose. Use the voltmeter instead.
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