TB 11-6625-620-85-2
2-1. Equipment Required. The equipment required for the calibration performance test is listed below.
Minimum use
Calibration
specificatians
Item
equipment
0
Range: to 150 Vdc
TS-362 B/U
Accuracy: 3% fs
Teletypewriter Test Set
TS-799/UGM-l
Functions as a pattern and distortion
generator; transmits "quick brown
fox" message; alternate R and Y and
selected characters; and reversal (dot
cycle).
2-2. Accessories Required. The accessory required for the calibration performance test is a 30-inch length of
50-ohm coaxial cable using two (2) plugs, type PJ-055B, for connectors.
SECTION 111
PRELIMINARY OPERATIONS
NOTE
It is recommended that personnel familiarize themselves with the entire procedure before
performing calibration.
3-1. Precautions. Before individual test equipment
(2) RATE switch to 75.
is connected into the calibration system, the
(3) TRANSITION SELECT switch to ALL.
following steps must be taken:
( 4 ) DISTORTION SELECT switches to
a. Verify that the POWER switch is set to OFF.
AVERAGE and SPACE/MARK.
b. Mechanically zero DISTORTION meter if
(5) FILTER switch to OUT.
required.
(6) POLARITY switch to -.
c. Set the POWER switch to 115V or 230V position
allowed by the locking guard. Disregard all other
trol Setting. a. CURRENT SELECT switch to 20.
switch settings at this time,
b. MESSAGE SELECT switch to ALT/R&Y.
c . BAUDS RATE switch to 7.5/75.
NOTE
When directions for control setting are not
d. DISTORT SELECT switch to BIAS SPACE.
e. MESSAGE TRANSMIT switch to ON.
given, the controls may be set to any
f . % DISTORT potentiometer to O.
position. However, if the controls had been
set to a particular position in a previous
NOTE
The following paragraphs are divided into
step, do not change the control setting
subparagraph a, performance check, and
unless directed.
subparagraph b, adjustments. When the
performance check is within tolerance do
d. Energize the Test Instrument and allow 10
minutes for it to warm up and stabilize before
not perform the corresponding adjustment.
making any connections.
When the performance check is not within
3-2. Test Instrument Setup. a. Connections. Con-
tolerance, perform the corresponding ad-
nect one end of the plug (PJ 055B) test cable to the
justment before continuing with the
SIGNAL INPUT jack of the Test Instrument, and
calibration procedure. When the per-
connect the other end of the plug (PJ 055) into the
formance check is not within tolerance and
the adjustment cannot bring it into
b. Control Setting for Test Instrument.
tolerance, the deficiency must be corrected
(1) CURRENT SELECT switch to 20.
before continuing with the procedure.
SECTION IV
CALIBRATION PROCESS
WARNING
HIGH VOLTAGE is used during the performance of this calibration.
DEATH ON CONTACT
may result if personnel fail to observe safety precautions.
3