Question

Which method can reduce dynamic error?

• A. By increasing accuracy
• B. By increasing precession
• C. By reducing sensitivity
• D. By reducing time lag

Hint:

Dynamic Error. Error arising when measuring time-varying quantities due to the instrument's inability to respond instantly. Primarily reduced by improving the instrument's speed of response (i.e., reducing time lag or increasing frequency response).

Answer 1

The Correct Option is D

Dynamic error occurs when measuring a quantity that is changing with time, and the measuring instrument cannot respond instantaneously to these changes
The difference between the indicated value and the true value of the time-varying quantity is the dynamic error
- **Time lag (Response Time):** This is the delay between a change in the measured quantity and the instrument's response
A significant time lag prevents the instrument from accurately tracking rapid changes, leading to dynamic error
Reducing the time lag improves the instrument's dynamic response and reduces dynamic error
- Accuracy: Relates to how close a measurement is to the true value, often considered under static conditions
While related to overall error, increasing static accuracy doesn't directly address dynamic error caused by response limitations
- Precision: Relates to the reproducibility or resolution of a measurement
High precision doesn't guarantee low dynamic error
- Sensitivity: Relates the change in output to a change in input
Reducing sensitivity might make the instrument less responsive overall, potentially worsening dynamic error in some cases, or having complex effects depending on the system dynamics
Therefore, reducing the time lag (improving the speed of response) is the most direct method to reduce dynamic error