Radio Shack 22-218 owner manual Measuring AC Voltage on a DC Source Bias

Measuring AC Voltage on a DC Source Bias

WARNING: NEVER MEASURE MORE THAN 30 VOLTS AC ON A DC SOURCE BIAS.

When an AC voltage has been superimposed on a DC source bias, you cannot take ordinary measurements. The readings wander on the scale and are not accurate.

However, if you know the approximate AC voltage and it does not exceed 30 volts AC, you can measure it by connecting a

0.1mF, 100-volt polyester film capacitor in series with the pos- itive (+) voltage source and the meter’s red probe.

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