‰ NOW 35 WPM ‰ TEXT IS FROM OCTOBER 2017 QST PAGE 38‰ USING THE DMM SAFELY AS LONG AS YOU DO NOT PLACE YOUR FINGERS ON ANY CIRCUIT THAT CONTAINS A HIGH ENOUGH VOLTAGE TO BE A DANGER TO YOU, THE SAFETY HERE IS SAFETY FOR THE METER. YOU NEED TO KNOW THE MAXIMUM METER VOLTAGE AND CURRENT LIMITS. IF YOU CONNECT THE METER TO MEASURE VALUES OVER THESE LIMITS, YOU MAY JUST POP A FUSE IN THE METER, OR YOU MAY DO TERMINAL DAMAGE, MEANING YOUVE LOST YOUR METER. FOR MEASURING VALUES BEYOND THE METER LIMITS, YOU CAN DESIGN AND BUILD A VOLTAGE DIVIDER OR CURRENT SHUNT. NEXT, SELECT THE PROPER DIAL SETTING AC OR DC. TYPICALLY, SELECTING AC WHEN YOU SHOULD HAVE SELECTED DC, OR DC INSTEAD OF AC, WILL NOT DAMAGE ANYTHING, BUT THE READING WILL NOT BE CORRECT. IF YOU ARE MEASURING A VOLTAGE AND PLACE THE PROBES ACROSS A VOLTAGE, SELECTING ANY OTHER METER DIAL POSITION CAN ALSO CAUSE A BLOWN FUSE OR A DEAD METER. FOR MEASURING VOLTAGE, THE TEST PROBES SHOULD BE CONNECTED TO THE COMMON TERMINAL USUALLY CODED BLACK AND THE VOLTAGE TERMINAL. FOR EXAMPLE, IN FIGURE 2, THE VOLTAGE MEASURING TERMINAL IS COLORED RED ON THE RIGHT SIDE. FINALLY, THE PROBES ARE CONNECTED ACROSS THE POINTS TO BE MEASURED. IN FIGURE 4, THEY ARE ACROSS A RESISTOR R1 THAT IS PART OF A CIRCUIT. CURRENT, AC OR DC, IS MEASURED BY BREAKING THE CIRCUIT, AS SHOWN IN FIGURE 5. THE TWO PROBES ARE CONNECTED IN SERIES WITH THE RESISTOR OR OTHER ‰ END OF 35 WPM TEXT ‰ QST DE W1AW ƒ 