TM 11-6625-596-12
Section II. DESCRIPTION AND DATA
1-4. Purpose and Use
Earphone ................... 15-, 125-, 300-, 1,000-,
Telephone Test Set TS-716/U is a portable, self-
and 8,000-ohm loads.
calibrating, multipurpose instrument used to test and
Microphone ................ 4-, 20-, 40-, 100-, 150-,
evaluate on a good- or bad- basis the electrical and
1,000-, and 50,000-ohm
acoustical
performance
of
sound
transducers.
loads.
Satisfactory operation of the item being tested is
indicated when the meter pointer reads within a good
Outputs:
scale reading in the test being performed or listed in the
Continuity test
table applicable to the test in TB 11-6625-596-12/1. Any
terminals .................... 6 volts ac open circuit.
other meter reading indicates unsatisfactory operation of
Telephone line
the equipment under test. All tests are evaluated on a
terminals .................... 24 volts dc (common
good or bad basis, except the tests for ringers, hand
battery-common battery
signal only).
TS-716/U performs the following tests:
20 hertz up to 100 volts
peak-to-peak for ringer
a
Transmit and receive
efficiency tests
of
and insulation resistance
complete telephone sets.
tests.
Test signal, white noise,
b.
Speed and percent break of telephone dials.
+3 db, 100 to 8,000
hertz.
c. Test
of
line-level
and
click
suppression
Carbon microphone
varistors.
terminals .................... 0-24 volts dc.
Noise generator
d.
Test of ringers.
terminals .................... Test signal, 0-8 volts rms,
depending on setting of
e.
NOISE GENERATOR
control, with 35-ohm
f.
load across terminals.
earphones, carbon and dynamic microphones, sound-
Line-voltage input............. 115 or 230 volts, 60
powered telephones, and special-purpose narrow-band
hertz.
transducers.
Power consumption.......... 35 watts
g.
b. Acoustical.
Test microphone:
H
Sensitivity................... 7.5 Mv/dyne/cm2
1-5. Technical Characteristics
response .................... 300 to 5,100 hertz 3 db.
a. Electrical
Inputs:
Test loudspeaker:
Telephone line ........ Common battery.
Common battery signal.
Sensitivity................... 90 db referred to 0.0002
Local battery.
dyne/cm2 with 10 mw
input at 1,000 hertz.
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