When troubleshooting programmable controller modules, voltage can be measured using a ___.

When troubleshooting programmable controller modules, voltage can be measured using a ___.

• A. DMM
• B. inductive vibrating tester
• C. either of these
• D. neither of these

Answer: (A)

Measuring voltage in programmable controller circuits requires an instrument that gives a precise numerical reading across the expected range. A digital multimeter is ideal here because it can measure both DC and AC voltages, you can select the correct range, and you get an exact value to compare against specifications. This is essential for verifying 24V DC supplies, logic-level voltages, and I/O statuses in PLC modules. An inductive non-contact tester can indicate whether voltage is present, but it does not provide the actual voltage level. It’s useful for a quick pass/fail check, not for diagnosing precise voltage values or troubleshooting issues based on exact readings. Therefore it cannot substitute for a DMM when you need the specific voltage measurement.

Measuring voltage in programmable controller circuits requires an instrument that gives a precise numerical reading across the expected range. A digital multimeter is ideal here because it can measure both DC and AC voltages, you can select the correct range, and you get an exact value to compare against specifications. This is essential for verifying 24V DC supplies, logic-level voltages, and I/O statuses in PLC modules.

An inductive non-contact tester can indicate whether voltage is present, but it does not provide the actual voltage level. It’s useful for a quick pass/fail check, not for diagnosing precise voltage values or troubleshooting issues based on exact readings. Therefore it cannot substitute for a DMM when you need the specific voltage measurement.