Final answer:
To measure an unknown supply voltage with an analog meter, start on the highest voltage range and lower the range if needed for better accuracy. Analog meters are not very effective for readings less than half a volt due to the small deflection. Measure carefully to ensure both safety and accuracy.
Step-by-step explanation:
When checking to determine an unknown supply voltage with an analog meter, it is advisable to start on the highest range of the meter to prevent damage to the meter and to protect against overloading. Analog meters are typically designed to measure a range of voltages, and using the right range is important to ensure accurate measurements. If your meter's highest voltage range is significantly above the expected unknown voltage, you can gradually decrease the range until you get an accurate reading. Remember that the voltmeter would not be extremely useful for voltages less than about half a volt since the meter deflection would be small and difficult to read. Furthermore, always ensure that you are following the safety standards when measuring electrical properties to avoid any potential hazards.
Steps to Measure Voltage
- Start with the highest voltage range on the multimeter.
- Apply the multimeter probes across the supply points.
- Observe the reading and adjust the range downwards if necessary for better accuracy.
- If the reading is too small to read accurately, switch to a lower voltage range.
There are practical limits to the sensitivity of analog meters, but they can provide measurements that are accurate to within a few percent. Always consider the potential for altering the circuit being measured as this could lead to inaccuracy.