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Sect. III Page 1
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SECTION III
CIRCUIT DESCRIPTION
].1
GENERAL DESCRIPTION
The Model 711A Power Supply furnishes a regulated
variable d-c voltage (HV supply) and an unregulated
a-c voltage. Regulation of the HV supply is obtained
by means of a main regulator, which regulates the
voltage supplied to the DC VOLTAGE output termi-
nals, and a seccndary regulator which regulates
the voltage which supplies the reference voltage and
most of the operating potentials for the regulator
circuits. Arrangement of the main components of
the d-c supply circuit is indicated in block diagram
form in Figure 3-1, and detailed circuitry of the
Model 711A is shown in the schematic diagram.
ence to the reference voltage bus (which is approx-
imately 200 volts negative with respect to the main
negative bus).
Power from an external source is applied to the
Model 711A through power transformer T1. Volt-
age for the HV supply is taken from a T1 secondary
winding which is tapped for various output voltages
and, by means of connections through microswitches
'operated by the COARSE control, provides an in-
put which is variable (paragraph 3-4b). Voltage
from the tapped secondary feeds selenium rectifiers
SR2, SR3, and capacitors C2, C3 connected as a
voltage doubler.
On
the schematic, voltages shown for the main posi-
tive bus, the HV voltage supply, and the main series
regulator are with reference to the main negative
bus; those shown for the main control tube, cathode
follower, secondary regulator (V3A and V3B), and
secondary regulator voltage supply are with refer-
From the doubler, the positive bus is brought through
the winding of overload relay K1 {para. 3-5), the se-
ries regulator, V1 and V2 (para.3-3), the OC VOLT-
AGE switch, and the milliammeter, to the OC VOLT-
AGE
+
output terminal. The voltmeter is connected
across the main positive and negative busses. With
the output circuit so arranged, there is continuous
MAIN
NE~nVE'
BUS
num
NIIL[I
SRl • SR]
C2. C3
~(
NICIIOlTlI£
SUIILI
TI/I50V-265V
/,-1
111 SIIItH!S
f- - - ------ - --- - - - --- --- - - - - --
/
/
//
.--_----=MA:=:'::..N.:..:POSJ=nVF:.::-::8US=--
-+-_----.
r-~""""
REF. w;lt.TAGC
/IUS
Figure 3-1.
Model 711A Power Supply
Block Diagram
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