Atec Agilent-81618A - Manual (Page 55)

Performance Tests Performance Tests
Agilent 81618A/9A and Agilent 81622B/3B/4B/6B/7B/8B User’s Guide, Second Edition
55
Return Loss Test
This performance test applies to Agilent 81622B/3B/4B/6B/7B Optical
Heads.
1 Make sure that all connectors are clean.
2 Connect the equipment as shown in Figure 13.
3 Press [Preset] on the mainframe.
Figure 13 Return Loss Reference Setup
N O T E To ensure traceability, use the 81610CC Reference Cable for
calibration measurements. Do not use the 81610CC Reference Cable
for measurements on a Device Under Test. Instead, use a measurement
patchcord.
C A U T I O N It is important to maintain the quality of the straight connector end of
the 81610CC Reference Cable. Never add another connector to the
straight end of the 81610CC Reference Cable, since a physical
connection is made. When the straight end of the 81610CC Reference
Cable is connected to the 81634B Power Sensor module, no physical
connection is made so there should be no degradation of connector
quality.
4 Zero the Return Loss Module and the Optical Head
5 Enable the internal laser source of the Return Loss Module and
allow 20 minutes for it to stabilize.
6 At the Power Meter:
a Set the averaging time [AvTime] to 1s