PS2520 Series Performance Verification
46
Handheld and Benchtop Instruments Basic Service
Complete the following procedures to verify constant voltage source accuracy.
Outputs 1 and 2. Use the following steps to check the OUTPUT 1 and
OUTPUT 2 accuracy.
1. Set up the Variac. Connect the power supply AC input to the Variac variable
output. Allow 20 minutes for the power supply to warm up and stabilize.
2. Ensure that the power supply output is disabled. Connect the DMM and
electronic load to the front panel OUTPUT 1 terminals. See Figure 3 for
details.
+
–
Power supply
Electronic load
–
+
Digital multimeter
+–
10 A
COM
Figure 8: Constant Voltage Source Test Setup
3. Set the DMM to measure 5 amperes DC.
4. Press SHIFT
→ OUT 1; verify that the “1” indicator lights up on the display.
5. Set up the power supply as follows:
VOLTS SET 20 V
CURRENT SET 2.55 A
OVP SET 22 V
6. Press OUTPUT ON/OFF. Verify that the “OUT” indicator lights up on the
display.
7. Enable the electronic load. Adjust the load until the DMM current reads
2.500 A.
8. Adjust the output of the Variac from 108 to 132 VAC (120 V range) or 198
to 242 VAC (220 V range). Verify that the power supply VOLTS readout
changes ≤0.003 volts over the adjustment range.
9. Press OUTPUT ON/OFF and disable the electronic load.
10. Press SHIFT
→ OUT 2; verify that the “2” indicator lights up on the display.
Constant Voltage
Source Accuracy
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