Teletype 28 Manual page 113

ISS 8, SECTION 573-115-700TC
3. 37 Universal Contact (Stunt Box) Mechanism (continued)
GENERAL APPLICATION TIMING- FINAL (USING DISTORTION TEST SET OR SIMILAR
EQthPMENT)
CONTACT BRACKET AND DRIVE CAM POSITION
Requirem~nt
The normally open universal contacts should close within
+
5 milliseconds of the closure
or
the normally open stunt box contact. -
To Adjust
Refine the drive cam (and if necessary, the bracket) (3. 36) adjustment by rotating the
drive cam within the specified limits.
TRIP CAM
Requirement
The normally open universal contacts should open within -5 +0 milliseconds of the
opening of the normally open stunt box contact.
To Adjust
Refine the trip cam (3.35) adjustment by rotating the trip cam on its shaft within
the specified limits. Tighten screw.
SPECIAL APPLICATION TIMING (USING DISTORTION TEST SET OR SIMILAR EQUIPMENT)
A. NORMALLY CLOSED CONTACTS (100 WPM FOR 83B2 SWITCHING SYSTEM)
1. The normally closed contacts should close within 50 to 80 divisions after the
start of the stop pulse.
2. The normally open contact should close prior to the end of the no. 3 pulse.
3. The normally open contacts should remain closed for at least 238 divisions
(100 wpm DXD with 742 scale divisions).
Note: The relation between the normally closed universal contact marking pulse
and the stop impulse of the received signal varies with the range scale setting
of the unit.
Page 113