When checking a circuit of unknown Voltage using an analog meter, which scale should be selected for maximum range?

Selecting the highest scale on an analog meter when checking a circuit of unknown voltage allows for the safe measurement of voltages without the risk of damaging the meter or affecting the circuit. By choosing the maximum range, such as 0-600V, the analog meter can accommodate a wider variety of voltage levels. This is particularly important when you don't know the actual voltage present; choosing a higher scale reduces the possibility of overloading the meter, which could occur if the voltage exceeds the selected range.

This approach also enhances the accuracy of the measurement, as meters can often provide more precise readings within their optimal ranges. Thus, having the flexibility to measure up to 600 volts ensures that even high voltages can be measured effectively, without the concern of exceeding the scale. This method is a standard practice in electrical work, promoting safety and accuracy in measurements.