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1-18
In ordinary repetitive operation, where the OPERATE period is fixed in advance
by the operator, there is no need to patch the RUN input.
It is internally
connected to the "PP" signal, which is controlled by the ANALOG MODE button
labeled "pp" (Paragraph 1.3.3).
Thus, ordinary repetitive operation requires
no special patching; the operator simply selects the desired A (IC) and A (OP)
periods, and depresses the "PP" button.
However, if the operator desired to
control the timer from an arbitrary logic signal, local patching at the RUN
terminal overrides the internal connection.
1.3.6.2
Outputs.
The timer has two logic outputs (A and
A)
and
an analog output TB (Time Base).
The terminals are connected to the 0.12.1607
Control Tray.
The A and
A
outputs normally control the IC and OP buses re-
spectively.
The IC and OP patch terminals, connected internally to the A and
A
terminals, act as inputs to the IC and OP buses.
Logic signals at these
terminals override the internally generated signals and provide external con-
trol of the IC and OP buses.
The TB output is an analog ramp generated by an internal integrator and provides
a voltage proportional to time.
The ramp output may be used to drive the hori-
zontal axis of readout devices (Plotting Board, Oscilloscope, etc.,) or may be
used as an analog signal for problems requiring a signal proportional to time.
The ramp integrates from zero to plus reference voltage during a given operate
cycle.
Thus, the scaled output is
(tit
),
where t
is the length of the
max
max
operate cycle.
(This is a unit scaled notation; the run terminates when t
=
t
max'
which means (tit
)
=
1.0 unit, or 10 volts.)
max.
1.3.6.3
Controls.
The period of the timer is determined by three
sets of controls:
a pair of dials
(one for A, one for
A),
a group of three X
(multiplier) pushbuttons (.1, 1, 10), and two TIME SCALE pushbuttons (2 msec,
1 sec).
Note that the dials and the multiplier pushbuttons affect the rep-op
timer only,
while the TIME SCALE pushbuttons control the timer integrator as
well as the capacitors in the computer integrators.
The A and
X
controls utilize ten-turn Vernier dials with a built-in turn counter.
A window at the top of each dial displays an integer representing the number of
complete revolutions of the
dial~
The graduations around the dial allows a
fractional part of a revolution to be set to two figures.
Thus, the dial can be
set for 5.20 turns, 8.75 turns, etc.
The dial has been offset by 0.50 turns.
Consequently the minimum position is 0.50 turns while the maximum position is
10.5 turns.
The multiplier pushbuttons are a series of momentary contact switches connected
in such a manner that when one is depressed it electrically clears any previously
selected pushbutton.
The length of the A and
X
periods is the product of three factors:
the number
of turns on the Vernier dial, the multiplier setting, and the TIME SCALE selected.
A simple equation for determining the lengths of either the A or
A
periods is
TIME SCALE X Multiplier X Vernier
=
Length of Period.
The following table gives
the minimum and maximum time periods for each range.
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