TM 11-6625-596-12
Control, indicator, or fuse
Function
Power switch ....................................................... Connects TS-716/U to either 115- or 230-volt ac line, depending on position
POWER ON lamp................................................. of switch guardplate In center position, turns TS-716/U off.
Function buttons: ............................................... Lights when power switch is in the on position.
NOISE GEN ADJ......................................... 16 pushbutton switches, used to set up tests for various sound transducers.
Connects output of power amplifier through voltage divider and rectifier
network to panel meter
control.
HAND GENERATOR................................... Connects TS-716/U to
test output of
hand generator connected to
TEL LIN E
terminals L1 and L2.
RINGER 2400 .............................................. Connects TS-716/U to supply minimum 20-hertz operating current to
2,400-ohm ringer connected to TEL LINE terminals L1 and L2.
RINGER 12000 ............................................ Connects TS-716/U to supply minimum 20-hertz operating current to
5,300-ohm ringer connected to TEL LINE terminals L1 and L2.
VARISTOR .................................................. Connects TS-716/U to supply minimum 20-hertz operating current to
12,000-ohm ringer connected to TEL LINE terminals L1 and L2.
connected to ARTIFICIAL RECEIVER terminals Used with LONG LINE
and SHORT LINE switches, METER SENSITIVITY control, and VALUE
EARPHONES ....................................................... Connects TS-716/U to measure efficiency of click suppression varistors
controls C and D.
Connects TS-716/U for frequency response and sensitivity checks of
earphones connected to EARPHONES terminal or appropriate connector
SOUND POWER TELEPHONE............................ on
panelboard lA2A14
Used with RECEIVER LOAD switch.
switch .................................................................. Connects TS-716/U to check sensitivity of sound-powered telephones
Used
METER ADJ ......................................................... with test microphone, test loudspeaker, and LEVEL controls A and B.
Applies calibrated signal from power amplifier to input of meter amplifier.
Used with METER SENSITIVITY CALIBRATE control to set gain of
TELEPHONE EFFICIENCY-SEND....................... meter amplifier
and TELEPHONE EFFICIENCY- ......................... Connects TS-716/U for efficiency tests.
RECEIVE
INSULATION RESISTANCE ............................... Connects TS-716/U to
test insulation resistance of
equipment connected
between TEL LINE terminals L1 and L2
INSULATION RESISTANCE
control is used to set meter pointer to calibrate mark Depressing TEST switch
then indicates whether insulation resistance is greater or less than 1
DIAL SPEED ........................................................ megohm.
Connects TS-716/U to measure speed of telephone dial connected to TEL LINE
terminals L1 and L2 DIAL SPEED control is used to set meter
a pointer to calibrate mark TEST switch is depressed and dial is
operated.
DIAL BREAK........................................................ Meter indicates whether dial speed is within specifications
Connects TS-716/U to measure ratio of make time to break time of dial switch
contacts connected to TEL LINE terminals L1 and L2DIAL BREAK control is
used to set meter pointer to calibrate mark When TEST
switch is depressed and dial is operated, meter indicates whether ratio of
MICROPHONES CARBON .................................. make-to-break time is within specifications.
Connects TS-716/U to test frequency response and sensitivity of carbon
microphones connected to MICROPHONES
CARBON terminalsor to
Connects these terminals to a 24-voit de
bias supply; used with MICROPHONE LOAD switch and MICRO-
MICROPHONES OTHER TYPE
Connects TS-716/U for frequency response and sensitivity tesis!of all types of
microphones that do not require a de bias current
Used with MICRO-
BATTERY switch................................................. PHONE LOAD switch.
Sets up TS-716/U to check cb,a cbs,b or lbC types of telephones At CB-CBS,
connects 24-volt dc microphone bias supply to TEL LINE terminals L1
Meter ........................................................................... and L2 during telephone efficiency and varistor test Provides good-bad
..................................................................................... indication for equipment under test; graduated from 0 to 100 microamperes de
..................................................................................... Calibrate position for all tests is indicated by red
CALIBRATE controls: ......................................... mark and letters CAL
at midscale.
Used to set meter pointer to midscale (CAL) position when corresponding
function button is depressed.
See footnotes at end of table.
2-5