Tektronix PS280 Service & Reference Guide

Adjustment Procedures
5 V Fixed Equipment Required: Digital multimeter and variable resistive load
See Figure 5-1 on page 5-8 for adjustment locations used in this procedure.
1. Adjust the 5 V fixed output:
a. Setup the equipment:
• Set the digital multimeter to measure a DC voltage of + 5.25 V.
• Connect the digital multimeter to the terminals of the 5 V Fixed
output.
b. Make the 5 V adjustment:
• Adjust VR401 until the multimeter displays 5.00 V (± 0.25 V).
c. Set up the equipment:
• Disconnect the multimeter from the Laboratory DC Power Supply.
• Set the digital multimeter to measure a DC current of 3.25 A.
• Adjust VR403 fully counterclockwise.
• Connect a variable load and the multimeter in series to the termi-
nals of the 5 V Fixed output.
• Adjust the variable load until the multimeter displays 3.25 A.
• Disconnect the multimeter from the power supply and reconnect
the variable load (without changing the setting) to the terminals of
the 5 V Fixed output.
• Set the digital multimeter to measure a DC voltage of + 5.25 V.
• Connect the digital multimeter to the terminals of the 5 V Fixed
output.
d. Make the current limit adjustment:
• Slowly adjust VR403 clockwise until the multimeter display shows
a voltage drop of 5 to 6 mV.
e. Set up the equipment:
• Disconnect the digital multimeter and the variable load from the
power supply.
• Set the digital multimeter to measure a DC current of 3.25 A.
• Connect a variable load and the multimeter in series to the termi-
nals of the 5 V Fixed output.
• Adjust the variable load until the multimeter displays 3.10 A.
f. Make the overload adjustment:
• Adjust VR402 until the OVERLOAD 5V3A indicator starts to light on
the Laboratory DC Power Supply.
Disconnect the test setup.
P32S0 & PS2S3 Laboratory DC Power Supply Module-Level Service Manual REV AUG 1991 5.7

Tektronix PS280 Specifications

General

Brand	Tektronix
Model	PS280
Category	Power Supply
Language	English