Your digital multimeter should last for a number of years with reasonable care, but there may come a time when you multimeter malfunctions and you’ll have to decide whether to repair it or buy a new one. Before going out and looking for a new multimeter you should use the following techniques to troubleshoot and repair you multimeter.
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The first step is to check the battery. Try to power on your. If the multimeter doesn’t turn on or the display is dim you may have a weak or dead battery. Simply replace the battery and you should be good to go.
If your multimeter powers up but you aren’t getting accurate measurements you may have faulty test leads. Set your multimeter to read resistance and touch the test probe leads together.
This versatile 7 function digital multimeter provides precise measurements and tests for a variety of electronics. This multimeter tests AC/DC voltage, DC current,. View and Download CEN-TECH 69096 operating instruction online. 7 FUNCTION DIGITAL MULTIMETER. 69096 Multimeter pdf manual download. History of the world part 1.
It should read zero ohms. If you have resistance ratings of over one ohm or the reading is erratic, you should be able to fix the problem by replacing the probe leads. If you still haven’t been able to address the issue the next step is to disassemble your digital multimeter. Use a small screwdriver to remove the screws holding the case together.
After you’ve opened the locate the fuse and remove it. If it’s a clear glass fuse inspect the inside to see if the thin wire within is burned out. If it’s blown, replace it. If it’s a ceramic fuse you’ll have to check its resistance with another multimeter and, if there is no resistance, you’ll need to replace it. (Consult your multimeter’s manual to find out which fuse you need.) Look for wires and other connections that may be corroded or broken. If you do find a damaged connection desolder it with a soldering iron and wick and resolder it.
Check for loose parts or screws inside the multimeter’s case and fix them in the appropriate way. Reassemble your digital multimeter, set it to measure resistance, and touch the probe leads together. It should read well under one ohm.
If the multimeter is still malfunctioning, it may be time to replace it. George George Leger has a Masters in Electrical Engineering from Stanford University, worked in private industry pioneering surface-mount technology and in government research labs for twenty years, published several papers on surface-mount technology, co-authored papers published in national symposiums on accelerator technology, was past president of SMTA and an adjunct professor at the community college level, holds a patent, and is a certified microchip design partner, serving as a consultant to many companies developing electronic circuits. You May Also Like.
Note the main selector wheel on the front of the multimeter. Use this wheel to select the function you need and the sensitivity of the measurement you're going to make. You'll notice three jack inputs arranged in a vertical line on the bottom right. They are marked – from top to bottom – 10ADC, VΩmA and COM. The meter comes with a pair of leads, one black and one red, that fit into these jacks. On the left side, you'll see a multipin transistor /hFE jack for testing transistors.
You'll also see an On/Off button. Turn this on to activate the LED display.
Measuring Voltage and Current. To measure current, switch the red lead to the 10 ADC jack and leave the black one in the COM jack. Turn the dial to the 10 amp (10A) area, make sure the meter is on, touch the leads to the exposed circuit wires and note the reading.
If it's below 0.2 amps, turn off the meter, place the red lead into the VmA jack and turn the dial one position counterclockwise to the 220m setting in the DC amp (DCA) area. Turn on the meter and take another reading. Continue turning the dial counterclockwise – all the way to 200 µ if necessary – to increase the accuracy of the reading. Measuring Resistance and Continuity. When you measure resistance, the unit supplies a small current, so there must be no other current source.