TB 11-6625-620-35-1
Table 4.1. Baud Rate Frequencies
(2) Set MESSAGE SELECT switch to SELEC-
TED PULSES.
(3) Set all five MARK SPACE toggle switches to
SPACE.
(4) Set MESSAGE TRANSMIT switch to ON.
(5) Set CURRENT SELECT switch to 60.
(6) Set DISTORT SELECT switch to OFF.
(7) Adjust % DISTORT control to 0 settings.
(8) Turn BAUD RATE control to settings listed
in table 4-1.
(9) Frequency counter indications in time in-
terval shall be shown in table 4-1.
b. Adjustments. No adjustments can be made.
4-2. Distortion Generation Test. a. Performance
Check.
Table 4-2. Distortion Generation
(1) Using the same equipment setup, set
MESSAGE SELECT switch to DOT CY.
(2) Set DISTORT SELECT switch to BIAS
SPACE.
(3) Set MESSAGE TRANSMIT to ON.
(4) Set BAUDS RATE switch to 75 DOT
CYCLES.
(5) On oscilloscope shall appear a series of mark
and space pulses of equal width.
(6) Adjust % DISTORT control to settings as
listed in table 4-2
(7) Frequency counter indications shall be as
shown in table 4-2.
(8) Set DOT CYCLES switch to 22.
a. Performance Check.
(9) Set the controls of the oscilloscope so that a
(1) Turn off Test Instrument, remove power cord
pulse of 10 cm is displayed.
and remove from protective case.
(10) Set the DOT CYCLES switch to 97.
(2) Reconnect power cord and set POWER switch
(11) Observe that the oscilloscope displays a
on Teat Instrument to 115V ON or 230V ON, depen-
pulse of approx 6.2 cm.
ding on source of AC power. All other controls may be
(12) Set the DOT CYCLES switch to 37.5.
in any position.
(13) observe that the oscilloscope displays a
pulse of approx 6.2 cm.
(3) Position MESSAGE TRANSMIT switch to
(14) Set the DOT CYCLES switch to 75.
OFF.
(15) Observe that the oscilloscope displays a
(4) Teat Instrument connectors (lower rear
pulse of approximately 3 cm.
chassis test points) measurements shall show the
(16) Set the DOT CYCLES switch to 100.
multimeter indications listed in table 4-3.
(17) Observe that the oscilloscope displays a
b. Adjustments. No adjustments can he made.
puke of approximately 24 cm.
4-4. Final Procedure. a. Deenergize and disconnect
b. Adjustments. No adjustment can be made.
all equipment.
4-3. Power Supply Test
b. Replace protective cover on Test Instrument.
WARNING
c. In accordance with TM 38-750, annotate and af-
fix DA Label 80 (US Army Calibration System).
HIGH VOLTAGE is used during the per-
When the Teat Instrument cannot be adjusted-within
formance of this calibration. DEATH ON
tolerance, annotate and affix red tag, DA Form 2417
CONTACT may result if personnel fail to
(Unserviceable or Limited Use Tag).
observe safety precautions.
Table 4-3. Power Supply Measurements
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