Final Assessment — LCR METER CALIBRATION OVERVIEW

TM-INST-015 — Open Handout Course: TM-INST-015 Questions: 15 | Time: 20 minutes | No notes Passing score: 13/15 (87%). All calculation questions must be correct.

Instructions

Answer all 15 questions without referring to the TM or course units. Show your work on calculation questions. Score yourself using the answer key below.

Questions

1. State the scope of TM-INST-015: what does it cover and for what application?

2. What safety precaution does TM §1-3 specify? State it exactly.

3. In one sentence, state the operating principle of the LCR METER CALIBRATION OVERVIEW as described in Chapter 2.

4. What is the primary source of measurement error or uncertainty identified in Chapter 2?

5. What reference standard(s) does Chapter 3 specify for this calibration?

6. Where must calibration be performed (what connection point or condition is required per Chapter 4)?

7. Write the error formula from Appendix A. Include variable names and units.

8. The reference value is 50.000 Ω. The instrument reads 50.23 Ω. (a) Compute the error in Ω. (b) Compute the error as % of the reference value. Show your work.

9. The reference frequency is 10.000 MHz. The instrument reads 10,000,450 Hz. (a) Compute the error in Hz. (b) Compute the error in ppm. Show your work.

10. How many steps does Chapter 5 specify for the calibration procedure?

11. State the calibration acceptance criterion from the TM. Cite the chapter and section.

12. Your measurement gives an error of stated in Chapter 5. Determine pass or fail. Show your reasoning.

13. The reference value is 100.0 mV. Your instrument reads 99.3 mV. (a) Compute error in mV. (b) Compute error as %. (c) State whether the instrument is reading high or low.

14. List all required entries in the calibration log per Chapter 7.

15. What is the difference between the Chapter 5 calibration procedure and the Chapter 7 verification? Why does the TM require both?

---

Answer Key

Complete all questions before reading this section.

1. See TM §1-1. Your answer must name what is being calibrated/used and the application context. (TM §1-1)

2. See TM §1-3. Copy the exact text. (TM §1-3)

3. See TM §2-1. Your sentence must state the physical or electrical principle — not just "it measures X." (TM Ch. 2)

4. See Chapter 2. Look for the terms error, uncertainty, drift, or limiting factor. (TM Ch. 2)

5. See Chapter 3. The reference standard is the known-good source used to check the instrument. (TM Ch. 3)

6. See Chapter 4. The connection point or required condition is specified there. (TM Ch. 4)

7. See Appendix A. Write the formula exactly as shown in the TM. (TM App. A)

8. (a) 50.23 − 50.000 = +0.23 Ω (b) 0.23 / 50.000 × 100 = +0.46% (TM App. A)

9. (a) 10,000,450 − 10,000,000 = +450 Hz (b) 450 / 10,000,000 × 1,000,000 = +45 ppm (TM App. A)

10. Count the numbered steps in Chapter 5. The answer is in the TM. (TM Ch. 5)

11. See TM Chapter 5 or Chapter 7. Copy the criterion exactly with units. (TM Ch. 5 or Ch. 7)

12. Compare your computed error to the criterion from Q11. State: "error = [value]; criterion = [TM value]; result = PASS or FAIL." (TM Ch. 5 or Ch. 7)

13. (a) 99.3 − 100.0 = −0.7 mV (b) −0.7 / 100.0 × 100 = −0.7% (c) Low — negative error means the instrument reads below the true value. (TM App. A)

14. See TM Chapter 7. List every item specified. (TM Ch. 7)

15. Chapter 5 is the active calibration — reference inputs are applied and adjustments may be made. Chapter 7 is an independent verification after all adjustments are complete — no further adjustment is made during verification. The TM requires both because a passing measurement taken during the adjustment process does not prove the final configuration is stable; verification is the acceptance test. (TM Ch. 5, Ch. 7)

Score and Routing

If Q8, Q9, or Q13 are wrong: Return to Unit 4 regardless of total score. TLO-2 requires calculation competency.