Null Mode provides what kind of response over the line?

• A. Peak Mode
• B. Null Mode
• C. Minimal response
• D. Maximum response

Answer: (B)

Null mode is about reaching a null condition, where the indicator shows no signal. When the probe is directly over the buried line, the system is adjusted so the signals cancel each other out, producing a zero or null reading. That zero reading is what confirms you’re exactly over the line.

If you were in peak mode, you’d look for the strongest signal to indicate position, which is the opposite behavior of null mode. A minimal or maximum response doesn’t define the precise point the way a null does, so they don’t describe what null mode provides.