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1.4
THE ANALOG READOUT PANEL
The analog readout panel (Figure 1.12) consists of amplifier OVERLOAD indicators,
a multi-range VOLTMETER.
A DIGITAL VOLTMETER readout display is also located on
this panel if a digital voltmeter (DVM) is provided with the computer.
The
following paragraphs describe the function and use of the various controls and
components.
1.4.1
Amplifier OVERLOAD Indicators
The amplifier OVERLOAD indicators provide a graphic overload display for each
individual amplifier.
The indicators are numbered (AOO to A79) to correspond
with each amplifier position in the computer.
The overload indicators are
normally extinguished.
A lit position indicates that the corresponding ampli-
fier is in an overload condition.
During warm-up periods, various overload
lamps may light but should be extinguished once the corresponding amplifiers
have settled down.
•
1.4.2
The DIGITAL VOLTMETER (DVM) Readout
The DVM readout displays four digits, a polarity sign, and a fifth digit for
overrange.
The output of any selected amplifier in the coefficient of any
selected potentiometer can be displayed on the DVM.
The reading may range
from ±O.OOOO to ±1.1999 which, when mUltiplied with the reference voltage,
represents the voltage into the DVM.
As an example a reading of 1.1999 is
equivalent to 11.999 volts (UNITS DISPLAYED X REFERENCE VOLTAGE).
1.4.3
The VOLTMETER
The VOLTMETER is controlled by the RANGE and FUNCTION rotary switches located
directly below the meter.
The RANGE switch selects the voltage range of the meter. - The ranges provided
are:
30, 10, 3, 1, 3, and 0.1 volt for full scale meter deflection.
A NULL
position is also provided on this switch to convert the VOLTMETER to a null
meter.
The FUNCTION switch determines the source of the input signal.
Note that many
positions on the switch are primarily used for maintenance purposes.
However,
these positions enable the operator to quickly check all power supply voltages
to ensure proper computer operation.
Table 1.7 describes the function of each
RANGE switch position.
1.5
THE AUXILIARY CONTROL PANEL
The auxiliary control panel (Figure 1.13) contains the pushbutton controls and
indicators for the interface components (comparator and function relays), and
the ten handset pots (PO through P9).
1.5.1
The COMPARATOR Controls
A pair of pushbuttons (one numbered, one blank) is provided for each of the
eight comparators in the computer.
These pushbuttons are used to force the
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