Discussion
Arrange the steps of a routine instrument check in order.
1. measure the verification tiles and compare
2. allow the instrument to warm up and stabilise
3. record the result and proceed or investigate
4. perform the white and black calibration
Answer: D
Correct answer: 2 - 4 - 1 - 3
Warm up first, since the source and the electronics drift until they are stable and a calibration made cold will not hold. Then calibrate on the white and black standards, which sets the scale. Then measure the verification tiles, which are independent of the calibration and so test it. Finally record the result and either proceed or investigate.
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