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mum amount of error that can occur when taking a specific measurement. For example, the meter may be accurate to 2000 V, plus or minus 0.8 percent. A 0.8 percent error at the kinds of voltages used in robots typically, 5 to 12 V DC is only 0.096 V. The number of digits in the DMM display determines the maximum resolution of the measurements. Most DMMs have three and a half digits, so they can display a value as small as 0.001 (the half digit is a 1 on the left side of the display). Anything less than that is not accurately represented and there s little need for accuracy better than this. DMMs vary greatly in the number and type of functions they provide. At the very least, all standard meters let you measure AC volts, DC volts, milliamps, and ohms. Some also test capacitance and opens or shorts in discrete components like diodes and transistors. These additional functions are not absolutely necessary for building general-purpose robot circuits, but they are handy when troubleshooting a circuit that refuses to work. The maximum ratings of the meter when measuring volts, milliamps, and resistance also vary. Before buying a specific DMM, make sure you understand what the maximum values are that the meter can handle. Most DMMs have maximum values ratings in the ranges of: DC voltages to 1000 V AC voltages to 500 V DC currents to 200 mA with up to 10 A using a fused input Resistance 2 M One exception to this is when you are testing current draw for the entire robot versus just for motors. Many DC motors draw an excess of 200 mA, and the entire robot is likely to draw 2 or more amps. Obviously, this is far out of the range of most digital meters, but there are ways to do it as is shown in 19. DMMs come with a pair of test leads, one black and one red. Each is equipped with a needlelike metal probe. Standard leads are fine for most routine testing, but some measurements may require that you use a clip lead. These attach to the end of the regular test leads and have a spring-loaded clip on the end. You can clip the lead in place so your hands are free to do other things. The clips are insulated to prevent short circuits. Most applications of the DMM involve testing low voltages and resistance, both of which are relatively harmless to humans. Sometimes, however, you may need to test high voltages like the input to a power supply and careless use of the meter can cause serious bodily harm. Even when you re not actively testing a high-voltage circuit, dangerous currents can still be exposed. The proper procedure for using a meter is to set it beside the unit under test, making sure it is close enough so the leads reach the circuit. Plug in the leads, and test the meter operation by first selecting the resistance function setting (use the smallest scale if the meter is not auto-ranging). Touch the leads together: the meter should read 0 or something very close (a half ohm or so). If the meter does not respond, check the leads and internal battery and try again. Analog multimeters often have a zero adjust, which provides a basic calibration capability for the meter. Once the meter has checked out, select the desired function and range and apply the leads to the circuit under test. Usually, the black lead will be connected to the ground, and the red lead will be connected to the various test points in the circuit.
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