AT&T Bell System 146A Description And Use

BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 634-200-504
Issue 1, December 1975
146A TEST SET
DESCRIPTION AND USE
CONTENTS
1. GENERAL
2. DESCRIPTION
3. BATTERIES
4. ESTABLISHING A TALKING CIRCUIT
5. WIRE IDENTIFICATION
PAGE
2
5
6
8
means of jacks on the front panel to which tone
is s,vitched by a function selector switch.
1.04
The battery package contains three sizes of
carbon-zinc batteries for a total of six
separate batteries. Battery life in service should
be in excess of 150 hours.
1.05
Some important features of the 146A test
6. BALANCE TESTING
17
set are:
7.
FAULT LOCATING
18
(a) Precision tone source compatible with the
1097 A precision filter, allowing noise free
8. CONTINUITY TESTING
20
wire identification and ·cable fault location.
9.
MAINTENANCE
20
(b)
Minimized interference to customers.
1. GENERAL
1.01
The 116A test set is a multifunction test set
providing audio frequency signals for wire
identification, construction testing, and fault locating.
It also provides talk battery and alerting features
for obtaining and maintaining a communications
link between points along a cable. It is intended
that the test set be usable by both cable construction
and cable repair forces.
1.02
The frequency of the tone source in the
test set is accurately controlled to 577 .5 Hz,
making it compatible with the 1097 A noise filter
both for fault loc:1-t:~,g imd wire identification tasks.
Both th~ • 0,g11al level and interruption rate of the
tone source are controllable from the front panel
allowing the user to tailor the tone to his specific
needs.
1.03
There are three tone outputs, one for wire
identification, another for balance testing,
and a third for fault locating. Tone output is by
NOTICE
(c) Automatic line monitor which speeds employee's
work.
(d) Selection of "spreading" or "nonspreading"
signal output to aid in rapidly identifying
pairs.
(e) Balance testing.
(f) . Relay controlled cable fault location operation.
(g) Internal battery test.
(h) Adjustable interrupt rate which allows
simultaneous operation of several test sets
in the same cable.
(i) Internal talk-battery.
G) Compatible with existing signal locating
apparatus.
(k) Lightweight, portable, integrated circuit
design.
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
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