D

Figure D-1. Accuracy and Linearity Test Setup

3.Turn the instruments on, enable the laser source and allow the instruments to warm up for at least 20 minutes.

Note

The linearity test must only be performed at either 1300nm or

 

1550nm. The accuracy test must be performed in the -20dBm

 

range at 10￿W at both 1300nm and 1550nm.

 

 

I. Accuracy Test

1.On both power meters:

a.Set the calibration factor to zero.

b.Set the wavelength to the wavelength of the laser source.

c.Set the instruments into MEAS mode. Make sure AUTOranging is o￿ and select the -20dBm range.

d.Set the averaging time to 500ms.

2.Make sure that the HP 8156A output is disabled. ZERO the DUT.

3.Connect the HP 8156A output cable to the standard head and ZERO the standard meter.

4.Enable the HP 8156A output. Change the HP 8156A attenuation until the power meter standard displays 10.00￿W.

5.Connect the attenuator output cable to the DUT. Check the DUT display and note the result in the test record.

6.Repeat steps 1 to 5 at the second wavelength with the corresponding source.

D-4 Performance Tests