Tektronix PS 503A, Instruction Manual

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Operating Instructions— PS 503A
NOTE
Supply is connected for 20 to 40 V output.
Fig. 1-4. Monitor and load connections.
NOTE
Supply is connected for 0 to 40 V output.
Fig. 1-6. Reverse current shunt (Rs) with active load.
ting a shunt resistor (Rs) as shown in Fig.1-6 provides an
external, reverse-current path to the power supply
sources or delivers current only.
Over-voltage
The PS 503A is protected from
over-voltage conditions
by an over-voltage protection circuit that shuts down the
power supply when the voltage rises to about 26 V dc.
NOTE
The point at which the overvoltage protection blows
the fuse may be changed for specific applications by
changing the Zener diode.
OPERATION
The following steps demonstrate the use of the
PS 503A controls and connectors.
1. Install the PS 503A into (preferably) the high-power
compartment of the power module.
2. Press the OUT button to apply power to the
PS 503A. Observe that the+and - VOLTS indicator lights
come on
(the lights will be very dim at low voltages).
Single Supply Operation (±20 V Maximum)
1. Set the + and — VOLTS controls for approximately
2 V.
NOTE
Supply is connected for 0 to 40 V output.
2. Turn the CURRENT LIMIT controls fully ccw (to
protect the ammeter). Connect an ammeter between the
common terminal and the + or — terminal and adjust the
appropriate CURRENT LIMIT control for the maximum
desired current output.
Fig. 1-5. Ground loop created by grounded remote lead.
1-4
REV. A MAR 1977