Fluke DTX-1800 Technical Reference Handbook page 249

W
Caution
Do not disconnect the test reference cord from the
smart remote's output after setting the reference.
Figure 8-19. Setting the Reference in Far End Source Mode (1 Jumper Method)
Certifying Fiber Optic Cabling
Autotest in Far End Source Mode
If you do, you must set the reference again to
ensure valid measurements.
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