TB11-6625-596-12/1
Table 1. Index of Equipment-Continued
d. Set up the acoustic coupler with the test
microphone directly over and touching the screen of the
Test
test loudspeaker. Turn the NOISE GENERATOR switch
Nomenclature
procedure Norm
to DRIVER. Depress the METER ADJ button. Adjust
AIpha-numerical
Noun
(para)
(table)
the METER SENSITIVITY CALIBRATE control until the
M-116/G .......... Microphone, Dynamic ....... 7 ............. 2
meter reads midscale.
M-133/U .......... Microphone, Dynamic ...... 7 ............. 1
e. Depress the EARPHONES button.
M-135/U .......... Microphone, Dynamic. .... 7 .............
f. Set the LEVEL and VALUE controls as follows:
M-188/G .......... Microphone, Dynamic ....... 7 ............. 2
A ......... 10
C ......... 6
T-45 ................ Microphone, Carbon ........ 8 ............. 8
c
B ......... 8
D ......... 9
TA-1/PT ......... Telephone Set .................. 11, 12 , ..... 6, 7, 8
g. Push the LOW, CENTER, and HIGH buttons in
TA-43/PT ........ Telephone Set .................. 12, .......... 9, 10
TA-105A/FTC.. Telephone Set .................. 1 ............. 7, 8, 9 10
sequence. In each case, the meter should read in the
TA-236/PT ...... Telephone Set ................ 12, .......... 7, 8, 9, 10
green region. If the meter does not read in the green
TA-263/PrT ..... Telephone Set ................. 12 , ........... 9, 10
region, the equipment is not operating properly.
TA-264/PT ..... Telephone Set ................. 12 , ........... 7, 8, 10
NOTE
Varistors............................ 12,
If an abnormal indication is obtained
a
Carbon microphone.
during the starting procedure or during
b
Dynamic microphone.
c
the tests which follow, refer to the
Sound powered microphone.
operational checklist in TM 11-0662596-
4. Preliminary Control Settings
12.
CAUTION
6. Stopping Procedure. Turn the power switch to OFF.
Before applying power to Telephone
CAUTION
Test Set TS-716/U, set the front panel
Return the front panel controls to the
controls in the positions indicated below.
These preliminary control settings may
condition will prevent damage to the test
prevent the possibility of overloading the
set if the power switch is turned to on
panel meter and/or damaging the power
without observing the proper starting
amplifier.
Control
Setting
procedure.
Power switch ..........................................OFF,
7. Dynamic Microphones Test. a. Perform the
NOISE GEN ADJ button .........................Depressed.
BATTERY switch ....................................Any.
b. Set the front panel controls as follows:
CALIBRATE controls:
Control
Setting
DIAL SPEED....................................Counterclockwise.
BATTERY switch............................................Any.
DIAL BREAK....................................Counterclockwise.
MICROPHONE CURRENT control ...............OFF.
INSULATION REBISTANCE ...........Counterclockwise.
NOISE GENERATOR ......................Counterclockwise.
TEST CONDITION switch..............................ART REC.
METER SENSITIVITY.............................Counterclockwise.
NOISE GENERATOR switch .........................DRIVER.
NOISE GENERATOR switch ..................LOAD.
MICROPHONES OTHER TYPES button .....Depressed.
TEST CONDITION switch.......................COUPLER.
MICROPHONE LOAD switch.........................See table 2.
MICROPHONE LOAD switch..................OFF.
RECEIVER LOAD switch ...............................OFF.
RECEIVER LOAD switch ........................OFF.
LEVEL A end B controls ................................See table 2.
MICROPHONE CURRENT control ........OFF.
VALUE C end D controls ..............................See table2.
LEVEL A end B controls ........................Any.
VALUE C end D controls .......................Any.
c. The meter should read midscale. If the meter
5. Starting Procedure. Set the front panel controls as
does not read midscale, adjust the METER
SENSITIVITY CALIBRATE control for a midscale
a. Turn the power switch on and allow 30 minutes
reading.
for the equipment to warm up.
d. Connect the microphone plug into jack
1A2A14J7, 1A2A14J9, or 1A2A14Jll. See the Notes
control until the meter needle moves to CAL (red mark at
column in table 2 for list of specific jacks and/or special
midscale).
cables for the particular item to be tested. Connect the
NOTE
special cable leads to the front panel MICROPHONES
The needle of the meter will Normally
OTHER TYPES and LO terminals,.
fluctuate slightly. Set the CALIBRATE
e. Position the microphone unit squarely over the
control so that the needle swings equally
test loudspeaker screen. Hold the microphone in place
to the left and right of 'the red mark.
with the clamping fixture.
c. Depress the METER ADJ button. Adjust the
f. Press the LOW, CENTER, and HIGH buttons in
METER SENSITIVITY CALIBRATE control until meter
sequence. The meter should read within meter limits
again reads midscale.
indicated in Table 2 for each condition.
3