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The electrical details of the Repetitive Operation Group are covered in the
TR-20 Maintenance Manual
o
~.
Using Repetitive Operation
The computer is placed in the repetitive operation mode by selecting an appro-
priate compute time with the COMPUTE TIME MILLISEC and CALIBRATE VERNIER controls.
The Mode Control switch must be placed in the HOLD position.
The Rep Op Control
Panel has two terminations labeled SCOPE; one is a ground termination and the
other provides a sweep voltage for an external oscilloscope.
The use of this
sweep voltage eliminates difficulties in synchronizing the oscilloscope.
When
the CALIBRATE VERNIER is fully counter-clockwise, the compute time is indicated
by the position of the COMPUTE TIME MILLISEC switch
0
As the CALIBRATE VERNIER
is rotated, the compute time increases beyond the duration indicated by the COM-
PUTE TIME MILLISEC switch.
During the setup of a problem when attenuators are
being adjusted, the COMPUTE TIME MILLISEC switch must be placed in the OFF po-
sition so that the relays in the Integrator Networks can ground the summing
junctions.
If this is not done, loading errors will cause the attenuators to
be set incorrectly.
12.
DISPLAY NETWORKS
Display networks are available for the TR-20 to allow patching from various
computing components to an external display device.
Depending on customer re-
quirements, the TR-20 is shipped with either a 12.987 Display Network or
a
40.538 Electronic Comparator.
The Model 12.987 Display Network is a plug-in, wired through module.
It may
be mounted in position 17 of the non-linear row only.
It is not used if the
computer is equipped with a Model 40.538 Electronic
Comparato~
The Model 40.538 Electronic Comparator is a dual-width module, occupying po-
sitions 17 and 18.
The upper two-by-four terminal area (labeled DISPLAY)
provides the same patching connections as the 12.987 Network.
The illustration (Figure 27) shows the patch holes, including functions, lo-
cated on either the display module or the display portion of the electronic
comparator.
While the locations of the holes may differ, the functions are
identical.
54
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