Operation
Section 1
Page 14
Current
RED to RING
BLACK to TIP
GREEN to GROUND
Hookup:
R
B
G
About the Current Test
The
CURRENT
key measures DC current on the
subscriber loop to see if the telephone set has enough
power for operation, continually updating the information.
On the 945/945M and 965/965M, the
CURRENT
key
function also tests ground resistance to check integrity of
the ground connection at the station protector.
Press the
CURRENT
key, and the unit applies a 430 ohm
short across the pair to simulate an off-hook condition. The
unit displays loop current in milliamps and updates the
reading about two times per second.
Caution
If hazardous voltage warnings are displayed when the test set is
switched on or reset (or at any time during the testing procedure)
follow standard procedures for de-energizing and discharging
cables.
