The ___ and ____ test lead should be connected to the appropriate sockets on the rear of the instrument marked + and - respectively.

• A. Red and Black
• B. Black and Red
• C. Blue and White
• D. Green and Yellow

Answer: (B)

Understanding polarity and following the device’s labeling is essential. On this instrument, the rear sockets are marked plus and minus, and the correct pairing is the black lead to the plus terminal and the red lead to the minus terminal. This specific mapping ensures the measurement polarity matches the instrument’s internal reference, so readings are presented correctly and the circuitry remains referenced properly. Swapping the leads would reverse the polarity and could give an inverted reading or affect safety and accuracy. The other color combinations don’t align with the device’s labeled terminals, so they wouldn’t provide the intended polarity. Always connect leads according to the device’s marked terminals to maintain correct polarity and safe operation.