Agilent Technologies N3970A Spécifications télécharger pdf (Page 36)

N3970A UM-1

■ PERFORMANCE TEST

4. Switch on the instruments.

a. Switch on the lightwave multimeter.

b. Configure the laser source.

■ Set the laser source attenuation to 0 dB

■ Set the wavelength to 1310 nm

■ Note the actual (displayed) wavelength of the laser source in

the test re p o r t

c. Switch on the attenuator.

■ Set the wavelength to the wavelength of the laser source

in the test report

d. Configure the optical head and interface module.

■ Set the unit to dBm

■ Set the averaging time, T, to 100 ms

■ Set AUTO ranging on

■ Set the wavelength to the wavelength of the laser source

■ With the laser source and attenuator disabled, zero

the power meter

e. Switch on the N3970A (DUT) for permanent operation, by

holding the POWER key down for 3 seconds during turn-on

until PERM is shown in the display.

■ Set the DUT to "dBm"

f. Make sure that all the instruments are warmed up.

5. Make the reference measurement.

a. Enable the laser source and the attenuator output.

b. Change the attenuation of the attenuator until the optical

power meter displays -3.00 dBm.

Note In some cases the laser source will not be powerful

enough to give -3.00 dBm. In such case, set the attenuator to

0 dB and correct the appropriate values in the test report.

■ Note the setting of the attenuator for setting 1 in the test re p o rt

c. Change the attenuation of the attenuator until the optical

power meter displays -20.00 dBm.

■ Note the setting of the attenuator for setting 2 in the test re p o rt

d. Change the attenuation of the attenuator until the optical

power meter displays -30.00 dBm.

■ Note the setting of the attenuator for setting 3 in the test re p o rt

e. Change the attenuation of the attenuator until the optical

power meter displays -50.00 dBm.

■ Note the setting of the attenuator for setting 4 in the test re p o r t

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Agilent Technologies N3970A Spécifications Page 36