Agilent Technologies HP E5574A User Manual page 205

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Appendix D. Performance Test
Test IV. Linearity and Accuracy
1 Make sure that the cable connectors, lenses and detector
windows are clean.
Refer to the cleaning procedure.
2 Connect the equipment as shown in Figure D-4.
(If a second HP 81521B #001 Head is part of your OLA repeat
the test with this Head).
Ensure that the cables to and from the Attenuator are fixed on the
table and both optical heads are close together so that minimum
cable movement is achieved when connecting the cable to the
Standard or to the DUT Head.
3 Turn the instruments on, enable the laser source, and allow the
instruments to warm up for at least 20 minutes.
4 ZERO the power meters with the head connector adapters
covered with plastic caps (P/N 5040-9361 or 5040-9351).
5 First set the wavelength of the Laser Source to 1310 nm. After
performing the Linearity/Accuracy test set the wavelength to
1550 nm and perform the test again.
6 Set the CAL factor of both instruments to zero.
7 Set the WAVELENGTH of both instruments to the actual
wavelength of the Laser Source and note the wavelength in the
Test Record.
8 Set both instruments to MEASure, (display in µW), switch
AUTOrange off and select the –20 dBm range.
9 Enable the HP 8156A output, and change the HP 8156A
attenuation until the Power Meter Standard displays 10.00 µW.
10 Connect the attenuator output cable to the DUT and check that
the DUT display is between 9.75 µW and 10.25 µW. Note the
result in the Test Record.
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