5.2 Calibration procedure
(1) Establish and record the appropriate calibration conditions (5.1). Switch on all
instrumentation and wait for enough time to stabilize.
(2) Set up the instrument state of the reference meter and test meter according to the
instruction manual. Set the wavelength on all instruments for the source wavelength. Select
appropriate power ranges. Record the instrument states of both meters. Adjust the zero of
both meters if applicable.
(3) Measure the optical power with the reference meter Pstd,1. Multiply the measurement result
by the correction factor of the reference meter CFstd reported in its calibration certificate if
it has not been adjusted. Multiply by the correction factor CFchange calculated in 5.3.3 if
necessary. Record the measurement result, Pref,1 = Pstd,1 x CFstd x CFchange. This is the
best estimate of the true power.
(4) Measure the optical power with the test meter. Apply necessary corrections as suggested
by the operating instructions. Record the measurement result, PDUT,1.
(5) Calculate the first of a series of correction factors: