to 2, the AC or DC voltage is 100 volts (2 ⋅ 50 = 100V).
•If the function selector is set to 15 DCV, read the lower line of ACVA/DCVA on the multime- ter then multiply the reading you see by 5. For example, if
the needle points to 2, the DC voltage is 10 volts (2 ⋅ 5 = 10V).
•If the function selector is set to 15 ACV, read the AC15V line on the multimeter. For exam- ple, if the needle points to 10, the AC voltage is 10 volts.
Hint: When you use the multimeter to probe for a voltage in a high-voltage circuit, we recommend you do not try to position both test leads at once. In- stead, use an insulated alligator clip (not supplied) to clamp one test lead to the circuit's neutral or ground lead (usually a bare, green, or white lead in AC wiring circuits). Then place your free hand in your pocket or behind your back and probe for voltages with the other test lead. This helps prevent you from accidentally touching a hot wire, since you need only concentrate on one test lead.
Measuring Three-Phase AC Voltage
WARNING: BECAUSE OF THE DANGERS INHERENT IN MEASUR- ING THREE-PHASE CIRCUITS, WE STRONGLY RECOMMEND THAT
YOU DO NOT USE THIS MULTIME- TER FOR SUCH APPLICATIONS.
We designed this multimeter primarily to measure household AC voltages. If you want to measure 3-phase, line-to- line voltages, please note that the ac- tual voltage can be greater than the circuit’s rated line-to-ground voltage.
Most 3-phase power circuits are rated by their line-to-linevoltage. This volt- age is higher than the line (or phase) to ground voltage. To determine if a line-to-line 3-phase voltage exceeds the rating of this multimeter, multiply the rated line-to-ground voltage by 1.732 (the square root of 3). For ex- ample, if the rated line-to-ground volt- age is 300 volts, the line-to-line voltage is 300 ⋅ 1.732 = 519.6 V AC.
Warning: This voltage exceeds the multimeter’s rating. Therefore, you should not connect the multimeter to this circuit or to any equipment con- nected to the circuit. Doing so could present a dangerous shock hazard to you, and could also damage the mul- timeter.
If you do not know why there is a volt- age difference, you should not be working on three-phase power cir- cuits. These circuits are generally ex- tremely powerful and very dangerous. Special safety equipment should be worn when working around these dangerous circuits.
