SECTION 2
Type 503
OPERATING INSTRUCTIONS
General
To use the Type 503 effectively, the operation and capa
bilities of the instrument must be known. This section
describes the operation of the front-panel and rear-panel
controls and connectors, gives first time and general oper
ating information and lists some basic applications for this
instrument.
Power Requirements
The Type 503 line transformer primary can be wired for
either 117-volt or 234-volt operation, at a line frequency
of 50 to 60 Hz. At this line frequency, regulation of the
power supply will be obtained at line voltages between
105 volts and 125 volts when the line transformer is wired
for 117-volt operation, and between 210 volts and 250 volts
when the line transformer is wired for 234-volt operation.
Fig. 2-3 shows the transformer connections required for each
range of operation.
The Type 503 can be operated at any AC line frequency
from 50 Hz to 800 Hz, although higher line voltages may
be required at the higher line frequencies. See Fig. 2-1.
Fuse Requirements
A 1.25-ampere slow-blowing type fuse is used with 117-
volt operation; for 234-volt operation, a 0.7-ampere slow-
blowing type fuse is used.
CONTROLS AND CONNECTORS
The front panel of the Type 503 is shown in Fig. 2-2.
Functions of all front panel controls and connectors are
described in Table 2-1.
Fig. 2-1
Line voltage requirements
at
VQri0«s line
frequencies.
©
2-1
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