MIL-STD-2042-6B(SH)
NOTE 1: Use the ST to ST MQJ with a hybrid adapter (for example, an ST to SC hybrid adapter) to connect to optical fiber cable ends terminated with connectors other than the ST and the MIL-C-28876.
NOTE 2: For COTS connectors that cannot be mated to an ST to ST MQJ using a hybrid adapter, non-standard MQJs may be used.
MQJ
1
Cable assembly under test
MQJ
2
Light source
ST
connectors
Power meter
FIGURE 6C1-6. Test measurement (typical).
Step 5 - Measure and record the test power (in dBm) at the meter (designated as
P2).
NOTE: The value obtained for the test power, P2, should be less than the value obtained for the reference power. A value of the test power greater than the value of the reference power indicates that either a defective or dirty MQJ was used for the reference measurement. If a value for the test power greater than the value of the reference power is obtained, clean or replace the reference MQJ and repeat Step 2,
Step 3, Step 4 and Step 5.
Step 6 - Calculate the cable assembly link loss using the following formula and record the results:
BCA = ( P1 - P2 )
Where: BCA = Total cable assembly link loss in dB P1 = Reference power in dBm
P2 = Test power in dBm
NOTE: Some optical power meters will automatically calculate the cable assembly loss when the meter is referenced or zeroed after the reference power measurement. The reference and test optical powers
may be measured and the loss calculated using the formula above or the calculation capability of the optical power meter may be used. In either case, the cable assembly loss value should be a positive number and the value of the optical reference power shall be recorded.
NOTE: The cable assembly link loss value should be a positive number.
Step 7 - Repeat steps 2, 3, 4, 5 and 6 for each fiber in the optical fiber cable.
6C1-7
METHOD 6C1
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