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Control
Power ON-OFF Switch, S4
Mode Control Switch, SS
Voltmeter Function Switch, Sl
Voltmeter Range Switch, S2
NULL POT and Reference Selector
Switch, +lO/OFF/-lO (53)
VM Jack
Amplifier Selector Switch, s6
(AMPL SEL)
AMPL OUT Jack
Overload Indicators, OVLD IND
a.
Readout Facilities
Function
Controls application of primary ac power to the
power supply of the computer.
The voltmeter
is illuminated when power is applied.
Controls the operational mode of the computer.
Positions are RESET, HOLD, and OPERATE.
Controls voltmeter operation.
Positions are
POT BUS, NULL, VM, AMPL, and BAL.
Selects sensitivity for voltmeter.
Full scale
ranges of
0.1, 0.3, 1, 3, 10,
and
30
volts are
provided.
Used in conjunction with the voltmeter to mea-
sure voltages by the null comparison method.
Provides for external inputs to the voltmeter
when the Voltmeter Function Switch is in the
NULL or VM position
Selects an amplifier for output monitoring or
balancing.
Connected to the wiper of the AMPL SEL sWitch;
facilitates connecting any amplifier output to
external monitoring or measuring equipment.
Indicate an overload in the associated ampli-
fier when illuminated.
The readout facilities consist of a sensitive voltmeter, selector switches for
connecting the voltmeter to various points in the computer, and a precision ten-turn
potentiometer that is used to measure voltages by the null-comparison method.
The function of the related controls is described below.
The BALposition of the Voltmeter Function Switch (Sl) is used when balancing the
dc amplifiers.
The AMPL SEL switch (S6) is used to select the stabilizer output
of the amplifier to be balanced, (Figure Sa).
The balance potentiometer of the
amplifier is rotated until the meter reads zero.
Positions 1 to 20 of the AMPL
SEL switch are connected to the stabilizers of the 20 operational amplifiers;
positions 21 and 22 are connected to the stabLlizers of the plus and minus reference
amplifiers respectively.
The diodes in parallel with the meter protect the meter
movement.
13
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