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Problems measuring longer fiber runs? - DSP FTA Series

This is normally caused by dirty / faulty test leads.
 
Please check out the reference value stored in the tester. To do this, rotate the dial to Autotest and press F3 to View Ref.
 

DSP FTA Stored Reference Value

 図 1. Ref from DSP-FTA440S 

The values should be in the following range: 

  • DSP-FTA 410/20S
    62.5/125 µm Multimode Fiber, between -19 dBm and 20.5 dBm
    50/125 µm Multimode Fiber, between -23.5 dBm and 24.5 dBm

  • DSP-FTA 430S
    9/125 µm Singlemode Fiber, between -7.8 dBm and 10 dBm 

     
  • DSP-FTA 440S
    62.5/125 µm Multimode Fiber, between -8 dBm and 10 dBm
    50/125 µm Multimode Fiber, between -8 dBm and 10 dBm

 There could also be dirt in the adapter. Using alcohol and a lint free bud wipe, gently clean the inside of the SC adapters.