How to Use Series Tracking on a Triple Output DC Power Supply
A step-by-step tutorial on configuring your triple output DC power supply for symmetric dual-rail (+Vcc / -Vee) operation using internal series tracking.
When testing operational amplifiers, audio amplifiers, or data acquisition systems, you frequently need a bipolar power supply (e.g., +12V, Ground, -12V). While you could wire two independent power supplies together, a Triple Output DC Power Supply with an internal tracking feature makes this safer, faster, and more precise.
Step 1: Enable Series Tracking Mode
Locate the tracking control buttons on your front panel (often labeled INDEP, SERIES, PARALLEL). Press the SERIES button.
What happens internally: The power supply internally connects the positive terminal of CH2 to the negative terminal of CH1. CH1 is now designated as the Master, and CH2 is the Slave.
Step 2: Wire the Output Terminals
- CH1 (+) Terminal: Connect to your circuit's +Vcc (e.g., +15V)
- CH1 (-) or CH2 (+) Terminal: Connect to your circuit's Ground (0V / COM). Note: In series mode, these two terminals are internally shorted.
- CH2 (-) Terminal: Connect to your circuit's -Vee (e.g., -15V)
Step 3: Adjust the Master Voltage
Now, simply turn the voltage dial for CH1 (the Master). You will see the voltage on CH2 automatically mirror CH1. If you set CH1 to 15.00V, CH2 will output exactly 15.00V relative to the center tap, giving you a perfect +15V / -15V split rail supply.
Warning: Current Limits
In series tracking mode, the maximum current is limited to the rating of a single channel (e.g., 3A). The voltage is doubled across the outer terminals (up to 60V), but the current capacity remains 3A. Always set your Over-Current Protection (OCP) appropriately on the Master channel.
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