TB11-6625-596-12/1
d. Test carbon microphone portion, using the
11. Handsets Test. a. Perform the starting procedure
e. Test dynamic microphone portion, using the
b. Insert the telephone handset in the coupler. The
receiver should fit squarely over the test microphone. Fit
NOTES
the microphone over the test loudspeaker. The test
loudspeaker should be about in its midposition for this
1. Tape the microphone switch to ON
test.
when testing the microphone.
c. Test the receiver portion, using the procedures
in paragraph 9, but refer to table 6.
2.
The type of microphone used in
specific equipments is identified in
column 1 of table 1.
Table 6. Norms for Headset-Microphones
RECEIVER
LEVEL controls
VALUE controls
Meter Limits
Transducer
LOAD
Notes
switch
A
B
C
D
LOW CENTER
HIGH
a
H-33( )/PT
40
60
5
10
12
50-86 50-98
50-98
1A2A14J6
b
20
2
5
3
35-62 36-65
35-60
300
a
80
2
11
11
35-55 35-36
35-60
Use cable E.
H-60/PT
40
b
20
3
7
8
35-80 35-80
34-75
125
a
80
2
15
13
30-66 34-70
30-66
1A2A14J6
H-90( )/U
20
b
20
0
5
4
42-80 40-80
34-70
300
a
80
4
15
14
46-70 44-70
42-60
1A2A14J1
H-94/U
20
b
20
4
4
0
42-60 36-64
36-64
1A2A14J3
1000
a
20
0
9
14
40-75 40-75
30-70
1A2A14J7
H-138/U
150
b
10
6
6
6
40-70 40-65
30-70
1000
a
70
9
10
11
40-70 42-72
4070
Use cable E.
H-165/U
40
b
10
9
7
8
30-85 38-75
35-75
125
a
20
6
11
14
35-63 35-60
35-65
1A2A1J47
H-189/GR
1501
b
10
8
7
7
35-60 35-59
35-66
1000
a
20
4
11
16
34-70 32-70
34-68
Use cable E.
H-207/U
150
b
10
1
10
11
40-74 40-70
36-66
1000
a
20
3
10
16
30-65 35-65
35-65
1A2A14J17
H-250/U
150
b
10
9
6
8
30-65 40-65
35-60
1000
a
20
2
12
16
25-70 30-65
30-70
1A2A14J17
H-294/U
150
b
20
0
5
8
30-65 40-65
40-65
1000
a
40
9
10
9
30-65 30-72
30-65
Use cable C.
TA-1/PT
1K
30
2
7
2
25-65 25-67
20-68
1000b
a
MICROPHONE LOAD switch position.
b
RECEIVER LOAD switch position.
Control
Setting
a. General.
12.
Telephone Tests.
The click
MICROPHONE CURRENT control ...................OFF.
suppression varistor test (b below), the transmit test (c
VALUE C and D control ....................................C
D
below), and the receive test (d below) should be used in
TA-43/PT ...........................................................14
20
testing telephones with varistors.
The telephone
TA-I10A/FTIC ....................................................14
20
efficiency send and the telephone efficiency receive-
TA-236/FT .........................................................14
20
electrical tests (e and f below) should be used in testing
TA-263/PT .........................................................1
20
telephones that do not have varistors. The telephone
VARISTOR button ............................................Depressed.
(3) Remove the varistor from the telephone
efficiency send and telephone efficiency receive-
set and connect it to the front panel ARTIFICIAL
acoustical tests (g and h below) should be performed on
RECEIVER terminals. Use special cable E.
all telephones.
(4) Press the LONG LINE button and adjust
b. Click Suppression Varistor Test.
the METER SENSITIVITY CALIBRATE control so that
(1) Perform the starting procedures (para 5).
the meter reads midscale.
(2) Set the front panel controls as follows:
(5) Press the SHORT LINE button; the meter
Control
Setting
BATTERY switch ............................................. Any.
should read in the green region.
TEST CONDITION switch ............................... ART REC.
c. Transmit Test.
NOISE GENERATOR switch ........................... LOAD.
(1) Perform the starting procedure (para 5).
MICROPHONE LOAD switch ........................... OFF
(2) Set the front panel controls as follows:
RECEIVER LOAD switch ................................. OFF.
6
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