Getting Started 28
4.5 Preliminary Check
Complete the following steps to verify the Power supply is ready for use.
Verify AC Input Voltage
Verify and check to make sure proper AC voltages are available to power the instrument. The AC
voltage range must meet the acceptable specication as explained in section “2.1 Input Power and
Fuse Requirements”.
Connect Power & Self-Test
Connect AC power cord to the AC receptacle in the rear panel and press the power button. It will run
through a self-test procedure initially before booting to the main screen.
Input Check
Follow the steps below to check that the load is operating correctly, and that the load elements (power
transistors) are not damaged. A DC power supply rated for at least 5V and 1 A is required for this
check.
Step 1. Connect the input terminal to a DC power supply and congure the supply to output 5 V and
current limit to 1 A.
Step 2. Power on the load. The display will show the “OFF” annunciator above the voltage display.
Step 3. Turn on the DC power supply’s output. Observe the load’s measured voltage display, it should
read approximately 5 V.
Step 4. Press the “CC” button to enable the constant current load mode.
Step 5. Use the keypad to enter 0.5 A. Press the Enter key to set the value.
Step 6. The display should show CC = 0.500A on the bottom right.
Step 7. Press “On/O” to enable the load. The “On/O” button should light up, and the “O” indicator
on screen should disappear. The measured current should now display a value close to 0.5 A.
Step 8. This setup veries that the load is drawing power correctly from the power supply.
If the load does not show 5 V, or shows signicant current draw from the connected power supply, the
load may be damaged and need service. If when the supply is connected, showing 5 V on the load’s
display, and no current is drawn, the load may be damaged and need service.
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