Noise Test; Return Loss Test - Keysight Technologies 81625B User Manual

4 Performance Tests

Noise Test

Return Loss Test

62
This performance test applies to Keysight 81623B/4B/6B/8B Optical
Heads.
You must insert a module or a blank panel in the second channel position
NOTE
of the Keysight 8163A/B Lightwave Multimeter before you perform the
noise measurement.
1 Insert a Keysight 81618A or a Keysight 81619A Optical Head Interface
module into one slot of the Keysight 8163A/B Lightwave Multimeter
and connect the device under test, an 8162xA/B Optical Head, to the
Optical Head Interface module.
2 Make sure the optical input of the Device Under Test (DUT), an
8162xA/B Optical Head, is not receiving any light by placing a plastic
cap over the input adapter. Move to the DUT Power Meter channel,
press [Menu], move to <Zero>, and press Enter.
3 Press Appl, move to <Stability>, and press Enter. The Stability Setup
Screen appears.
4 Ensure that the correct channel is selected in the upcoming Module
Selection box.
5 Press [Menu] to access the Logging application menu screen.
6 Move to <Pwr unit>, press Enter, move to <W>, and press Enter.
7 Move to <AvgTime>, press Enter, move to <1 s>, and press Enter.
8 Move to <Range mode>, press Enter, move to <Auto>, and press Enter,
and press [Close].
9 Press the [Parameter] softkey, move to [TotalTime], press Enter, set the
total time to 00:05:00, which is 5 minutes, and press Enter.
10 Press the [Measure] softkey to start the measurement.
11 After the stability application has finished, press the [Analysis] softkey,
press the [more] softkey, and note [DP] as the noise value in the test
record.
This performance test applies to Keysight 81623B/4B/6B/Optical Heads.
1 Make sure that all connectors are clean.
2 Connect the equipment as shown in Figure 11.
3 Press [Preset] on the mainframe
Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User's Guide