PS280 and PS283 Adjustment Procedures
22
Handheld and Benchtop Instruments Basic Service
To adjust the current limit, perform the following steps.
1. Set the digital multimeter to measure a DC current of 3.25 A.
2. Adjust VR403 (5 V circuit board) fully counterclockwise.
3. Connect a variable load and the multimeter in series to the terminals of the
5 V FIXED 3A output.
4. Adjust the variable load until the multimeter displays 3.25 A.
5. Disconnect the multimeter from the power supply and reconnect the variable
load (without changing the setting) to the terminals of the 5 V FIXED 3A
output.
6. Set the digital multimeter to measure a DC voltage of +5.25 V.
7. Connect the digital multimeter to the terminals of the 5 V FIXED 3A output.
8. Slowly adjust VR403 (5 V circuit board) clockwise until the multimeter
display shows a voltage drop of 5 to 6 mV.
9. Disconnect the test setup.
To adjust the current limit overload indicator, perform the following steps.
1. Set the digital multimeter to measure a DC current of 3.25 A.
2. Connect a variable load and the multimeter in series to the terminals of the
5 V FIXED 3A output.
3. Adjust the variable load until the multimeter displays 3.10 A.
4. Adjust VR402 (5 V circuit board) until the OVERLOAD 5V3A indicator
starts to light on the power supply.
5. Disconnect the test setup.
Current Limit
Overload Indicator
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