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A minus sign on the screen indicates that the "tip" and "ring"
connections to the test set are reversed (This may indicate a
system problem).
6. D.C. loop current readings in the 23 to 35 ma range are
acceptable. Proceed to the "In Line" test.
D.C. loop current readings below 23 ma should be reported
the serving telephone company.
If the D.C. Current is over 35 ma, install the ITC-4001 LOOP
CURRENT ATTENUATOR included with the test set.
B. IN LINE TEST:
1. Set the POWER SWITCH to the OFF position.
2. Connect the tester to the C.O. line.
a. Connect the green alligator clip to the "tip" side and
b. Connect the yellow clip to the "tip" and the black
3. Select the In Line position on the test set.
4. Set the POWER SWITCH to the ON position.
The screen will display "In Line".
5. Operate the premise equipment "off hook".
The test set will display actual operating D.C. loop current.
This reading will almost always be different than the direct
C.O. line reading, due to differences in manufacturers
equipment and internal system options. D. C. loop current in
the 23 to 35 ma range usually provides the best system
operation.
6. If the D.C. current is over 35 ma, install the ITC-4001
LOOP CURRENT ATTENUATOR, included with the test
set.
the red clip to the "ring" side of the C.O. line.
clip to the "ring" side toward the premise equipment.
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