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INTRODUCTION
Are you planning to install a new telephone? Are you having a problem with a newly installed telephone? Then
the Model TT-400 Telephone Line Analyzer Kit will help you pinpoint exactly where the problem is. The TT-400
connects between your telephone and the telephone wall jack and performs the following four tests:
a) Line Test - Verifies the DC voltage to your telephone.
b) Ring Test - Verifies the AC ranging voltage to your telephone.
c) Loop Test - Verifies the condition of the telephone line from the telephone company central office to the
wall jack in your house.
d) Telephone Line Cord Test - Verifies the condition of your telephone cord (if detachable).
SPECIFICATIONS
DC LINE TEST
SWITCH POSITION:
LINE / RING
LINE OK:
FOR 1/3 OF FULL SCALE, V
in
= 40VDC
FOR FULL SCALE, V
in
= 120VDC
REVERSE POLARITY: IF PHONE LINE POLARITY IS REVERSED, LED WILL BE ON.
ACCURACY:
3% AT 40V DC
LOOP TEST
SWITCH POSITION:
LOOP
LOOP OK:
FOR 1/3 OF FULL SCALE, I
in
= 20mA.
FOR FULL SCALE, I
in
= 60mA
ACCURACY:
3% AT 20mA
RING TEST
SWITCH POSITION:
LINE / RING.
RING “?”:
40 Vrms TO 48 Vrms, 20Hz SUPERIMPOSED ON 48VDC.
RING OK:
48 Vrms TO 130 Vrms, 20Hz SUPERIMPOSED ON 48VDC.
THE REVERSE POLARITY (REV POL) LED WILL FLICKER DURING RING TEST.