Operating Instructions; Description; Operation - Tektronix PS 503 Instruction Manual

OPERATING INSTRUCTIONS

DESCRIPTION

The PS 503 is a dual 0 to 20 V DC constant-voltage,
current-limited, floating power supply that plugs into a
TM 500 Series Power Module. The supply is designed for
conveniently powering complementary and linear inte ­
grated circuits such as operational and differential ampli ­
fiers as well as differential comparators. A ground-
referenced +5 V auxiliary supply is also included which is
suitable for bipolar
incandescent displays and similar applications. With the
floating supply available for powering discrete interface
circuits and level shifting, the PS 503 can be used for many
digital/analog applications.
The plus and minus outputs from the dual floating
power supplies are independently variable or both variable
at a constant ratio by a common control. Each supply
provides a plus and a minus 0 to 20 VDC with respect to
the common terminal. By connecting across the + and —
terminals the PS 503 can also provide 0 to 40 VDC.
Either terminal may be grounded or floated to 350 V (DC +
peak AC). Each supply also features continuously variable
current limiting from 0 to 400 mA at both 20 V and 40 V
output.
The presence and variability of output voltages is
verified by voltage indicator lights on the front panel. The
brightness of these lights varies with output voltage.
A panel-mounted light-emitting diode indicates when the
PS 503 goes into current-limiting. Hard limiting is
indicated by maximum brightness of the light-emitting
diode as well as a dimming of the voltage indicator light.
These functions are easily evaluated by momentarily
shorting the output of the supply.

OPERATION

Preparation
The PS 503 is calibrated and ready for use when
received. It is designed to operate in any compartment of a
TM 500 Series Power Module. Refer to the Power Module
Instruction Manual for line voltage requirements and Power
Module operation.
Functions of front-panel
connectors are described on a foldout page at the rear of
this manual.
logic, light-emitting diodes,
controls, indicators and
NOTE
It is recommended that the Power Module be turned
off before inserting or removing the PS 503.
at the connector terminals can reduce connector life.
However, no interna! damage will result if the supply
is inserted into a live Power Module.
1. Install the PS 503 by aligning the upper and lower
rails of the plug-in with the Power Module tracks and
inserting until the plug-in panel is flush with the Power
Module panel. To remove, pull the release latch to
disengage the PS 503 from the Power Module.
2. Press the OUTPUT button to apply power to the PS
503 . Observe that the + and — VOLTS indicator lights
come on (the lightswill be very dim at low voltages).
NOTE
Before using the PS 503
Operating Considerations in this section regarding
certain precautions and proper techniques for connec ­
ting various loads.
Single Supply Operation (±20 V Maximum)
1. Set the + and — VOLTS controls for approximately
2 V.
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.
3. Remove the ammeter. Connect the load between the
common terminal and the + or — terminal. Adjust the + or
— VOLTS control for the desired output.
Combined Supply Operation (40 V Maximum)
1. Set the + and — VOLTS control for approximately
2 V and turn the CURRENT LIMIT controls fully ccw (to
protect the ammeter) .
Section 1 — PS 503
Arcing
for the first time read the
1-1