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\fuen the computer is first turned on, a check of amplifier balance will show de-
flections that are slightly high, but they will return to normal levels after a
warm-up period.
For unusual problems that might be especially sensitive to ampli-
fier unbalance or integrator drift, the amplifier can be balanced at more frequent
intervals in order to keep the meter deflection below one division.
e.
Overloads
The computer is equipped with an overload alarm system that indicates the presence
of an overloaded amplifier. The visual overload alarm is located on the left side
of the control panel.
The lamps are illuminated whenever their associated ampli-
fier is overloaded.
Lamps 1 to 20 serve the 20 operational amplifiers; lamps
21
and 22 serve the amplifiers associated with the plus and minus reference amplifiers
respectively.
The computer may be equipped with an audio overload alarm that is
located in the rear of the cabinet; it sounds an audible alarm when an amplifier is
overloaded.
The overload alarm system indicates that something is wrong with the problem patching,
the problem operation, or the computing components.
Usually, no harm is done to
.the equipment by short-term overloads, unless they are caused by excessively high
voltages other than those normally obtainable from the computer itself.
However,
several other reasons exist for clearing overloads soon after they are noticed.
(1)
If an overload is indicated for amplifier 21 or
22,
the value of the
plus or minus reference voltage may be other than
~10.00
volts, adversely affecting
problem solution.
An overload in either of these amplifiers generally indicates
a patching error, and should not be allowed to continue over an extended period of
time.
(2)
Overload of unassigned arnpiifiers does not damage the amplifiers or
affect the problem solution.
However, the fact that one or more overload lamps are
lit, however, may cause the operator to overlook an overload occurring in an
assigned amplifier, thus causing an erroneous problem solution and defeating the
purpose of the alarm system.
3.
READOUT FACILITIES AND MANUAL MODE CONTROLS
The operating controls for the readout and mode control circuits are grouped on the
sloping control panel area below the computing component cradles as shown in
Figure 4.
The functions of the controls are:
12
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