Exfo IQS-12002B Calibration System Manual de usuario descargar pdf (Pagina 68)

Calibration Methods

64 IQS-12002B

Power Meter

To measure nonlinearity:

1. Set the attenuators in the two paths so that the power measured on the

meter is the same whether the light is coming from branch a or from

branch b.

2. Open both shutters and measure the total power from both branches

simultaneously: P

total,i

3. Close the shutter on branch b and measure the power on branch a:

a,i

4. Close the shutter on branch a, open the shutter on branch b, and

measure the power on branch b: P

b,i

5. Add the individual power measurements.

If the sum is not equal to the total power measurement, the DUT

presents nonlinearity.

6. Using the first attenuator, attenuate the total power by the following

factor to the level of the sum of the individual power measurements

calculated in step 5.

7. Repeat steps 2 through 6 to cover the desired range.

(dB)log10

ib,ia,

itotal,

10i

×=

10 2log 3,01 dB≅

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 107 108

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Exfo IQS-12002B Calibration System Manual de usuario Pagina 68