EAI 580 Reference Handbook page 30

Table 1.3. Definition of Computer Set-Up Modes
Mode Function
STATIC TEST
(21)
SET POT
<g)
PROGRAM PANEL
<W
Similar to initial condition. Static test voltages can
be applied to integrators not normally provided with ini-
tial condition voltages, to permit checking computed
levels at other parts of the program via Function Relays.
All INT and
TIs
are forced to IC mode.
All amplifiers provided with low impedance feedback to
provide correct attenuator loading. Reference voltage
applied to high end of any pot selected for readout, so
that the pot coefficient may be read out. The servo am-
plifier is connected to the motor of an addressed pot, per-
mitting the pot to be set.
When this button is depressed the IC, HOLD, and OPERATE
modes may be controlled by logic signals applied to the
0.12.1607 Control Tray patch block. This mode also causes
the internal timer to automatically start operation.
1.3.6 TIME SCALE Switches and Controls
The TIME SCALE and X switches along with the TIMER controls are used to con-
trol the analog timer (repetitive operation) circuit. The timer circuit
generates the precise time intervals necessary to control the analog modes of
the computer for iterative or repetitive operation. The TIME SCALE pushbuttons
p~ovide a 500 to 1 speed-up of the entire computer.
The repetitive operation (Rep-Op) circuit allows both high-speed, and low-speed
repetitive operation. Any OPERATE or IC period from 100 ~sec to 100 sec may be
selected by the pushbuttons and Vernier controls provided to "bridge the gap"
between pushbutton settings. Separate Vernier controls are provided for adjust-
ment of the A (IC) and A (OP) periods.
The timer has the following inputs, outputs, and controls:
1.3.6.1 Input. The "RUN" tenninal on the analog patch panel
terminates in the control tray in the center of the first row. This input
starts and stops the timer, and allows rep-op runs to be terminated by some
condition other than elapsed time. For example, if it is desired to operate
the analog simulation until some analog variable crosses zero, the RUN input
may be patched from a comparator.
When RUN
=
0, the timer does not run; its output remains in the A (IC) state.
When RUN becomes high (logic ONE) the timer starts to run, starting with a full
A (rC) period, followed by anA (OP) period. It continues to cycle between A
and A as long as RUN
=
1.
1-17