PS503A

The Tektronix PS503 is a triple power supply plug-in for the TM500 system.

Manuals – Specifications – Links – Pictures

It supplies 0 to −20 V and 0 to +20 V at 1 A, as well as +5 V at 1 A, and was introduced in 1976.

It replaced the earlier PS503 version (1972), adding the capability to deliver ±20 V at 1 A when used in TM500 high-power compartments.

The variable supplies can be adjusted independently or can track one another, and are floating. The 5 V output is ground referenced.

Key Specifications

Output voltage	0 to +20 V and 0 to −20 V, floating; 5 V ±5%, ground referenced
Current limit	<100 mA to >1 A variable (0.4 A if used in low power compartment); 1 A fixed on +5 V
Ripple and noise	<3 mVp-p @ 1 A on either rail

Links

• Tektronix PS503A Power Supply Restoration by NFM @ YouTube
• Tektronix PS503A Power Supply: Part 1 (cleanup) / Part 2 (repair) by IMSAI Guy @ YouTube

Rear Interface

• +20 V output (22A)
• −20 V output (22B)
• ±20 V common (24A, 24B)

(connections below require various jumper changes in the PS503 as described in the manual)

• Remote resistor or voltage programming (via 25A, 25B) or
• Remote sensing (+ Sense 23A, − Sense 23B)

Pictures

• 

  PS503A Front Panel

• 

  PS503A Left Internal

• 

  PS503A Right Internal

• 

  Switch S95 in rear of PS503A (detects high power compartment)

• 

  PS503A Front Panel

• 

  PS503A Left Internal

• 

  PS503A Right Internal

• 

  PS503A Side

• 

  PS503A Rear connector

Components

Some Parts Used in the PS503A

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