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COMPARATORS AND FUNCTION RELAYS
9.1
INTRODUCTION
This chapter provides operating information for the comparator and function
relay portions of the Model -0.42.0340 Potentiometer-Comparator-Function Relay
Tray (Figure
9.1)
used in the 580 Computer.
Operating information for the
potentiometer portion of the tray is included in Chapter 3 of this manual.
9.2
THE COMPARATOR
The comparator used in the 580 is a completely self-contained device that alge-
braically compares two analog input voltages and provides a logic signal and its
complement as an output.
If the algebraic sum of the input voltages is positive,
the comparator output is high.
The comparator output is low when the algebraic
sum of the input voltages is negative.
In each case the output complement is
the inverse of the output.
The L (latch) patch terminal is used to inhibit the output logic circuits and
hold the comparator output at a particular state regardless of the inputs.
For
example, if the algebraic sum of the voltages being compared is positive, the
output of the comparator is high.
A high patched to the L terminal holds the
output high even if the algebraic sum of the input voltages goes negative.
The
L terminal can be used to inhibit the comparator output at a particular point
in a sequence of events, or after a predetermined number of clock periods
utilizing th3 digital counters.
The L terminal can also be patched to the com-
parator output (or its complement)
terminal to inhibit the comparator output
when the algebraic sum of the input voltages change polarity.
Figure 9.2 is a
typical comparator patching configuration.
9.3
FUNCTION RELAYS
The function relays are included on the Model 0.42.0340 POT-COMP-F/R tray
(Figure
-9.1).
Each tray contains one 2 Form C relay with the contacts and
wipers of the relay terminated on the patch panel (Figure
9.1).
One relay
is terminated in each patch panel field, i.e., function relay 0 is located
in FIELD 0, function relay 1 is located in FIELD 1, etc.
The patch panel is graphically worked with the relay shown in the set (S)
position.
Utilizing this diagram makes patching the various functions to be
switched a relatively easy task.
The FUNCTION RELAY pushbuttons, located on the auxiliary control panel, are
used to switch the relays.
Depressing a numbered pushbutton sets the relay
in the field that the pushbutton number coincides with.
The adjacent blank
pushbutton causes the relay to be reset.
The numbered pushbutton contains a
lamp circuit which, when lit, indicates the state of the relay.
9-1
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