User`s guide

Performance Tests Performance Tests
Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
53
6 Increase the attenuation of Atty1 by 10 dB and note the results in the test
record (#14).
7 On the DUT switch one range down to the -40 dBm (-10 for 81628B)
range.
Change Setup
1 Disable Atty1 and switch the output with the monitor output.
2 Set the attenuation of Atty1 to 35 dB and of Atty2 to 25 dB.
3 Enable Atty1 again.
4 Adjust the attenuation of both attenuators in the following order:
• Atty1: DUT Power Meter shows a reading of -37.2 dBm.
• Atty2: the REF Power Meter shows a reading of -47.2 dBm.
-40 dBm Range (equivalent to -10 dBm range for 81628B)
1 Disable Atty1.
2 Zero both Power Meters. On the 8163A/B with two installed power
meters, press [Menu], move to <Zero all>, and press Enter.
3 Enable Atty1.
4 Switch one range up to the -30 dBm (0 dBm for the 81628B) range and
note the power readings (#15).
5 Switch one range down (-40 dBm, -10 dBm for the 81628B) and note the
power readings again (#16).
6 Increase the attenuation of Atty1 by 10 dB and note the results in the test
record (#17).
7 On the DUT switch one range down to the -50 dBm range (-20 dBm for the
81628B).
8 If necessary, adjust the attenuation of Atty1 in order to be on the upper
limit of the range (i.e. -x7.y dBm).
9 Decrease the attenuation of Atty2 by 10 dB in order to be on the upper
limit of the -50dBm range at the reference power meter.
-50 dBm Range (equivalent to -20 dBm range for 81628B)
1 Disable Atty1.
2 Zero both power meters. On the 8163A/B with two installed power
meters, press [Menu], move to <Zero all>, and press Enter.
3 Enable Atty1.
4 Switch one range up to the -40 dBm (-10 dBm for the 81628B) range and