Extron Electronics Fiber Optic Test Set Setup Guide - Manual (Page 5)

5
Testing Multimode or Singlemode Links
Verify the Transmit Reference Cable
1. Turn on the power meter and light source. Allow the light source to stabilize for a
minimum of two minutes prior to taking measurements.
2. Set the FLS 101 to the desired measurement wavelength.
a. Use WAVE ID to allow the FPM 101 to automatically read the wavelength.
b. If using CW, manually set the FPM 101 to the same wavelength.
3. Select and prepare the transmit reference cable. The fiber type, SM or MM, must match
the link to be tested.
a. MM: Wrap and secure the transmit reference cable five times around the included
mandrel.
b. SM (TIA testing only): Form and secure a 1.2 inch (30 mm) diameter loop in the
transmit reference cable.
NOTE: Clean both ends of the transmit reference cable before proceeding.
4. Connect the transmit reference cable to the FLS 101 output port (MM or SM).
5. Mount an adapter cap on the FPM 101. The adapter cap must match the free connector
on the transmit reference cable.
6. Connect the free end of the transmit reference cable to the power meter. If necessary
press the dB/dBm button to display optical power in dBm.
NOTE: The normal power range is -20 dBm for MM, 0 dBm for SM, (+/-1 dB).
Output power will be approximately 3 dB less if a 50 micrometer (µm)
mandrel-wrapped reference cable is used instead of a 62.5 µm or when the tone
feature is active.
7. If measured power is not within the acceptable range, or the display reads HI or LO,
clean all fiber connections and measure again. If cleaning fails, replace the transmit
reference cable and repeat steps 4 through 7.
8. To set the reference level for later use, press and hold the FPM 101 Ref/Set button until
HELD SET is displayed. The currently measured level is now the new reference level for
the active wavelength. Once the reference level is set, the FPM 101 switches to insertion
loss (dB) mode and the display reads 0 dB, ± 0.05 dB.
FLS 101 FPM 101
0 dB
c
d
f
e
Transmit Reference Cable MM: Mandrel Wrap
(shown), or
SM: 1.2" (30 mm)
Dia Loop