4-7
For explanation purposes, let’s assume you wish to measure 30 volts dc. In this case, select the next
higher range position, 50V. When you place the range switch to the 50V position (as shown in view B of
figure 4-4), the meter pointer should rise from a little more than midscale to 30, which represents 30 volts
dc.
When measuring a known dc voltage, position the range switch to a setting that will cause
approximately midscale deflection. Readings taken near the center of the scale are the most accurate.
When measuring an unknown dc voltage, always begin on the highest voltage range. Using the range
switch, work down to an appropriate range. If the meter pointer moves to the left, you should reverse the
polarity of the function switch.
CAUTION
Always check the polarity before connecting the meter.
Q-4. Besides setting up the meter for expected voltage ranges, what must be strictly observed when
taking dc voltage readings?
Now let’s discuss how you take a voltage measurement on a component within a circuit. As an
example, let’s measure the voltage drop across the resistor shown in figure 4-5.
