HP 4937A Operating And Service Manual page 37

4937A
.EVERSE BAIT
3
The Line--Loop Reverse Battery Originate End
figure the HP 4937A as the Originate End proceed as follows:
nect the line under test to either 310'jack A or B.
!Ct SIGNALING A if the line under test is connected to 310-jack A or SIGNALING B if the line is
lected to 310-jack B.
ig
S!G SELECT key select Loop Reverse Battery
Signaling
mode. The LOOP REV BATTERY
should be
lighted.
ig ORIG/TERM key select ORIG. The ORiG LED should be lighted,
ify the following LEDs:
ON HK ORiG - lighted
OFF HK ORIG - off
ON HK TERM - lighted
OFF HK TERM - off
seize the line under test press ON/OFF HOOK key.
i line under test is seized when the LEDs indicate the following:
ON HK ORiG - off
OFF HK ORiG - Sighted
ON HK TERM ~ off
OFF HK TERM - lighted
)EL
)P R