TB11-6625-596-12/1
(3) Remove the receiver from the telephone
Control
Setting
handset.
Leave the transmitter connected in the
BATTERY switch ............................................. CB LBS.
handset.
TEST CONDITION switch ............................... TEL LINE.
(4) Connect the front panel ARTIFICIAL
NOISE GENERATOR switch ........................... LOAD.
RECEIVER terminals to the telephone handset wires
MICROPHONE LOAD switch ........................... OFF.
which have been removed from the receiver.
RECEIVER LOAD switch ................................ OFF.
(5) Connect front panel TEL LINE terminals LI
MICROPHONE CURRENT control ................... OFF.
and L2 to the corresponding terminals on the telephone
TELEPHONE EFFICIENCY-SEND button ....... Depressed.
set.
VALUE Card D controls .................................See chart below.
(6) Press the LONG LINE button and adjust
VALUE controls
the METER SENSITIVITY CALIBRATE control so that
Telephone
Notes
the meter reads midscale.
Set
C
D
(7) Press the SHORT LINE button. The
TA-43/PT
12
11
Set TA-43/PT on CB, use
meter should read in' the green region.
cable C.
e. Measurement of Telephone Efficiency Send-
TA-263/PT
12
11
Set TA-263/PT on CB, use
Electrical Test.
cable C.
the telephone handset.
(2) Set the front panel controls as follows:
(4) Connect the front panel ARTIFICIAL
Control
Setting
RECEIVER terminals to the telephone handset wires
BATTERY switch ................................... LB for local battery
which have been removed from the receiver.
telephones, CB
(5) Connect the front panel ARTIFICIAL
CBS for all others.
MICROPHONE terminals to the telephone handset wires
TEST CONDITION switch ..................... TEL LINE.
MICROPHONE LOAD switch ................ OFF.
(6) Connect the front panel TEL LINE
RECEIVER LOAD switch ....................... OFF.
terminals L1 and L2 to the corresponding terminals on
MICROPHONE CURRENT control ........ OFF.
the telephone set.
NOISE GENERATOR switch ................. LOAD.
(7) Press the LONG LINE button and adjust
TELEPHONE EFFICIENCY-SEND
the METER SENSITIVITY CALIBRATE control until the
button ................................................. Depressed.
meter reads midscale.
VALUE C control ................................... See table 7 (TEST
(8) Press the SHORT LINE button. The
CONDITION switch
meter should read midscale.
at TEL LINE).
(9) Set the TEST CONDITION switch to the
(3) If
necessary, adjust the
METER
ART REC position.
SENSITIVITY CALIBRATE control so that the meter
(10) Set the VALUE C control to 6 and the
reads midscale.
VALUE D control to 4 for the TA-43/PT and the TA-
263/PT.
(11) Press the LONG LINE button and adjust
from the telephone handset.
METER SENSITIVITY CALIBRATE control so that the
(5) Connect the front panel ARTIFICIAL
meter reads midscale.
MICROPHONES terminals to the telephone handset
(12) Press SHORT LINE button. The meter
should read between 40 and 60.
(6) Connect the front panel ARTIFICIAL
d. Receive Test.
RECEIVER terminals to the telephone handset wires
which have been removed from the receiver.(7) Connect
(2) Set the front panel controls as follows:
Control
Setting
front panel LINE terminals LI and L2 to the
BATTERY switch ............................................. CB CBS.
corresponding terminals on the telephone set.
TEST CONDITION switch ................................ ART REC.
(8) Press the LONG LINE button. The meter
NOISE GENERATOR switch ........................... LOAD.
should read within meter limits indicated in table 7 (TEST
MICROPHONE LOAD switch............................ OFF.
CONDITION switch at TEL LINE).
RECEIVER LOAD switch .................................. OFF.
(9) Set the TEST CONDITION switch to ART
MICROPHONE CURRENT control .................. OFF.
REC.
TELEPHONE EFFICIENCY-RECEIVE button .. Depressed.
VALUE C and D controls ................................See chart below.
(10) Set VALUE control C to value given in
table 7 (TEST CONDITION switch at ART
REC).
VALUE controls
Telephone
Notes
(11) Press the LONG LINE button. The meter
Set
C
D
should read within the meter limits indicated in table 7
TA-43/PT
1
5
Set TA-43/PT to CB, use
(TEST CONDITION switch at ART REC).
cable C.
TA-263/PT
1
5
Set TA-263/PT to CB, use
cable C.
7