EAI 580 Reference Handbook page 37

1-24
comparator output to a particular state regardless of its analog inputs. When
the pushbutton is released, the corresponding comparator returns to the state
dictated by the patch panel inputs. The numbered pushbutton, when depressed,
forces the patch panel output of the corresponding comparator high. Similiarly
depressing the blank pushbutton forces the comparator output low.
The numbered pushbutton contains an indicator lamp that lights when the compar-
ator output is high. When the comparator has a low output the lamp is extinguished.
Table 1.7.
VOLTMETER RANGE Switch Functions
Switch Position Function
OFF
PP (Patch Panel)
A BAL (Amplifier
Balance) *
S BAL (Stabilizer
Balance)*
P
SEL
30 (Volts)*
15 (Volts)*
10 (Volts)*
5 (Volts)*
-10 (Volts)*
-15 (Volts)*
-RV (Relay Volts)*
Disconnects the meter input.
VOLTMETER receives input from VM patch terminal on
Control Tray 0.12.1607.
Connects the stabilizer of a selected amplifier to
the meter for balancing purposes. Meter deflection
should be less than 1/2 division deflection for
balanced amplifier.
Connects the stabilizer of either the servo ampli-
fier or the amplifiers on the DFG setup panel to the
meter for balancing.
Connects an addressed pot to the meter for setting.
This position is used primarily when computer does
not contain
a
DVM and is operable only when the
RANGE switch is in the NULL position.
These switch positions connect the various dc volt-
ages in the computer directly to the meter.
*When balancing amplifiers or reading power supply voltages the RANGE switch
is inoperative; the appropriate meter ranges are selected automatically.
1.5.2 The FUNCTION RELAY Controls
The pushbutton controls for the eight function relays operate in a manner similiar
to the comparator controls. Two pushbuttons (one numbered, one blank) are asso-
ciated with each function relay. The numbered pushbutton, when depressed, forces
the relay to the set condition regardless of the patched logic inputs. The blank