Section 3: Performance Verification
Model 2231A-30-3 Triple-Channel DC Power Supply Performance Verification
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077102700/ July 2014
5. Set the oscilloscope as follows:
a. 1 mV/division
b. 1 MΩ input resistance
c. 20 MHz bandwidth limit
d. AC coupled
e. Line trigger
f. 2 ms/div
g. Set to measure V pk-pk and V RMS
6. Set the channel under test to the 100% full scale output voltage.
7. Set the channel under test to the 100% full scale output current.
8. Turn the DUT output on.
Do not touch the load resistor. The load resistor may become hot enough to cause burns.
9. Enter the oscilloscope measurements in the table for checking Noise at 20 MHz.
This completes the verification procedure for one channel. If needed, return to step 1 to run through
the procedure for the next channel.
Check Current Noise
Equipment required
High-current hookup wire
(bold line connections)
Oscilloscope
1 Ω load resistor
Oscilloscope 10X probe
For each channel sequentially.
1. Plug the DUT into your local line power from the mains.
2. Plug the test oscilloscope into the same mains outlet as the DUT.
Some AC power sources create large amounts of high-frequency noise on the power line that the
instrument may not fully reject. Noise directly on the mains is typically better controlled. Use the
same mains outlet for both the DUT and test oscilloscope to avoid ground loops which may cause
noise.