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Sect. I Page 1
SECTION I
GENERAL DESCRIPTION
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Dangerous voltages are present at the terminals and within this instrument
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1·1
GENERAL DESCRIPTION
The Model 71lA Power Supply is a general-purpose
low-power d-c and a-c voltage supply particularly
suited to powering experimental setups.
By means of the facilities provided by the Model
711A the following voltages are made available at
the output terminals on the control panel:
Unregulated ac:
6.3 volts, 3 amperes maximum load current
(two supplies) or
6.3 volts, 6 amperes maximum load current
(one supply) or
12.6 volts, 3 amperes maximum load current
(one supply, tapped at 6. 3V).
Regulated dc:
o
to 500 volts, continuously variable; maxi-
mum output load current, 100 mao
NOTE: Insulation within the Model 711A permits
operating the d-c output voltage as much as 500 volts
from chassis ground so that two Model 71lA power
supplies may be operated in series to obtain 1000
volts d-c output while each instrument chassis re-
mains at ground potential.
The d-c output of the Model 71lA has high stability;
for line voltage variations within rated limits, the
level of the regulated output will vary less than O. 5%
or 1 volt (whichever is greater), and from no load
to full load the level of the output will vary less than
0.5% or 1 volt (whichever is greater). Ripple will
be less than 0.001 volt.
While the internal impedance of the Model 711A will
vary both with the d-c load current and the frequency
of any reflections from the equipment being powered,
the internal impedance of the Model 711A will be
less than 10 ohms with any load current and at any
frequency up to a few megacycles.
The dc output is continuously monitored by two
meters, a voltmeter and a milliammeter. A low
and high range are provided for each meter so that
low values of voltage and current may be read accu-
rately.
The power supply is protected from input or out-
put overload by (1) a fuse in the line-voltage input
circuit and (2) a relay, in the main positive bus,
which operates at overload current to interrupt con-
duction through the regulator.
1·2
INSPECTION
This instrument was thoroughly tested and inspected
before being shipped, and is ready for use when re-
ceived.
After the instrument is unpacked,
it
should be in-
spected carefully for damage received in transit.
If
any shipping damage is foUId, follow the procedure
outlined in the" Claim for Damage in Shipment"
sheet in this instruction manual.
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