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Fiber Optic Test Meters • Operation 14
11. Connect the receive reference cable to the FPM 101.
12. Connect the free ends of the transmit and receive reference cables together using an
appropriate coupler, or use a nearby bulkhead connector.
FPM 101
0.4 dB
N
M
Coupler
or
Bulkhead
Receive Reference
Cable
Transmit Reference
Cable
N
Adapter Cap
MM: Mandrel Wrap or
SM: 1.2 inch (30 mm)
Dia Loop (Shown)
Do Not Remove
This Connection
FLS 101
Figure 9. Connect the Receive Reference Cable
13. Verify the insertion loss of the reference cable pair is less than 0.75 dB, the maximum
allowed by the TIA (Extron recommends 0.4 – 0.5 dB).
If the insertion loss (dB) is not within these values:
• Disconnect the transmit and receive cables at the coupler (or bulkhead). Clean the
free ends of both cables and both sides of the coupler (bulkhead), then repeat
step 11 through 13.
• If the insertion loss is still not acceptable, replace both test reference cables and
begin again with step 1 on page 12.
Insert the Link
1. When the insertion loss is acceptable, (< 0.75 dB), disconnect both the transmit and
receive reference cables from the coupler or bulkhead.
NOTE: Do not disturb the reference cable connections at the light source or the
power meter.