TB11-6625-596-12/1
Table 9. Norms for Telephone Efficiency Send-Acoustical Test
TEST CONDITION
TEST CONDITION
LEVEL
switch in COUPLER
switch in TEL LINE
Telephone
controls
Notes
unit
VALUE
VALUE
control
Meter limits control
Meter limits
A
B
C
C
TA43/PT 1.............
10
8
16............
30-70......
16 .........
40-60 ......
Set on CB. Install 2 BA3 batteries. Use cable C.
TA43/PT................
10
7
20............
30-76......
20 .........
40-60 ......
Set on LB. Use cable C.
TA-105A/FTC........
10
5
15............
23-82......
15 .........
30-60 ......
Use cable C.
TA-263/PT ...........
10
7
16............
35 70 ......
16 .........
35-60 ......
Use instructions
TA-263/PT ...........
10
7
12............
40 81 ......
12 .........
34-72 ......
Use instructions for TA43/PT. Disconnect
filter from telephone L, -L, . Use cable E.
TA-236/PT ............
10
8
17............
35-71......
17 ........ .
40-70 ......
Set on LB. Use cable E.
TA-264/PT ............
10
6
19............
35-70......
19 .........
35-60 ......
use cable C. Install batteries. Be sure cradle
switch is locked down.
(3) The meter should read midscale. If the
h. Telephone Efficiency Receive-Electrical Input,
meter does not read midscale, adjust the METER
Acoustical Readout.
SENSITIVITY CALIBRATE control for a midscale
(1) Perform the starting procedure (para. 5).
reading.
(2) Set the front panel controls as follows:
(4) Place the telephone handset in the
coupler. The receiver should fit squarely over the test
Control
Setting
microphone.
BATTERY switch ................................ LB for local battery tele
loudspeaker. The test loudspeaker should be about in
phones, CBLCBS for
its midposition for this test.
all others.
(5) Connect front panel TEL LINE terminals LI
TEST CONDITION switch .................. COUPLER.
and L2 to the corresponding terminals on the telephone
set.
MICROPHONE LOAD switch ............. OFF.
(6) Press the LONG LINE button. The meter
RECEIVER LOAD switch ................... OFF.
should read within meter limits indicated in table 10.
MICROPHONE CURRENT control .... OFF.
TELEPHONE EFFICIENCY-
NOTE
RECEIVE button ............................ Depressed.
Tape handset switch to ON while testing.
LEVEL A and B controls .................... See table 10.
VALUE C control ................................ See table 10.
Table 10. Norm for Telephone Efficiency Receive-Electrical Input., Acoustical Readout
LEVEL controls
VALUE
Telephone unit
control
Meter limits
Notes
A
B
C
TA43/PT............
20
2 .......
0 ............... 35-70......
Set on CB. Install 2 BA-3 batteries. Use cable C.
TA-105A/FTC....
0
5 .......
15 ............. 30-71......
Use cable E.
TA-236/FT.........
0
6 .......
16 ............. 30-70......
Use able E.
TA-263/PT ........
0
9 .......
12 ............. 30-70......
Use instructions for TAA3/PT. Disconnect fil ter from telephone
L1-L2
TA-264/PT ........
0
0 .......
19 .............
35-70......
Install batteries. Be sure cradle switch is locked down. Use cable C.
13. Dials Test. a. Dial Speed Test.
(2) Rotate the DIAL BREAK CALIBRATE
(1) Perform the starting procedure (para 5)
control until the meter reads midscale.
(3) Connect front panel TEL LINE terminals LI
and depress the DIAL SPEED button.
(2) Adjust the DIAL SPEED CALIBRATE
and L2 to the dial. If the dial is installed in a telephone
control until the meter reads midscale.
set, connect TEL LINE terminals LI and L2 to
(3) Connect front panel TEL LINE terminals LI
corresponding terminals on telephone set and lift
and L2 to the dial. If the dial is installed in a telephone
handset off cradle switch.
set, connect TEL LINE terminals LI and L2 to
(4) Press the TEST button, and with free
corresponding terminals of telephone set and lift handset
hand, dial "0" (operator). The meter should read
off cradle switch.
between 40 and 60.
(4) Press the TEST button, and with the free
14. Ringers Test. a. Perform the starting procedure
hand, dial "0" (operator).
The meter should read
b. Connect the front panel TEL LINE terminals to
between 40 and 60.
b. Dial Percent Break Test.
the ringer. See the chart below for the special cable
required. If the ringer is installed in a telephone set,
and depress the DIAL BREAK button.
9