Fluke DTX-1800, Technical Reference Handbook

Page: 369 / 398

How to Test Your Test Reference Cords
3. Set the Reference
A-5
A
3. Set the Reference
3-1 Make the connections shown in Figure A-3.
3-2 Turn the rotary switch to SPECIAL FUNCTIONS, then
select Set Reference. If both a fiber module and a
twisted pair or coaxial adapter are attached, select
Fiber Module next.
3-3 Make sure that the reference value is good:
•
For 50/125 µm fiber, the reference value must be
better than -24.50 dBm (for example, -23.50 dBm is
a better value)
•
For 62.5/125 µm fiber, the reference value must be
better than -20.00 dBm (for example, -19.50 dBm is
a better value)
•
For 9/125 µm fiber, the reference value must be
better than -8.00 dBm (for example, -7.50 dBm is a
better value)
If the value is not good, do the reference procedure
again with a different test reference cord.
amd174.eps
Figure A-3. Reference Connections
Mandrel used only for
multimode fiber tested
with the DTX-MFM2
modules.