What is the allowed speed tolerance during the ASM test?

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Prepare for the California BAR Smog Technician Test. Review key topics with flashcards and multiple choice questions, each question includes hints and explanations. Get ready to ace your exam!

Multiple Choice

What is the allowed speed tolerance during the ASM test?

Explanation:
During the ASM test, the vehicle on the dynamometer must follow the prescribed speed within a small, fixed margin. That margin is three miles per hour, which is a practical allowance to account for instrument drift, wheel slip, and minor timing differences while keeping the test results consistent with real driving conditions. If the tolerance were larger, speed deviations could skew emissions data; if it were smaller, it would be too difficult to maintain during routine testing. So the established value is three miles per hour.

During the ASM test, the vehicle on the dynamometer must follow the prescribed speed within a small, fixed margin. That margin is three miles per hour, which is a practical allowance to account for instrument drift, wheel slip, and minor timing differences while keeping the test results consistent with real driving conditions. If the tolerance were larger, speed deviations could skew emissions data; if it were smaller, it would be too difficult to maintain during routine testing. So the established value is three miles per hour.

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