Keithley 2280 Series - Page 406

Appendix B: Verification Series 2280 Precision DC Power Supply Reference Manual
B-40 077085503 / March 2019
Figure 111: 20 MHz voltage and current noise test setup
5. Set the oscilloscope as follows:
 1 mV/division
 1 MΩ input resistance
 20 MHz bandwidth limit
 AC coupled
 Autotrigger
 1 ms/div
 Set to measure V
p-p
and V
RMS
6. Set the DUT to the 100% full-scale output voltage.
7. Set the DUT to the 100% full-scale output current.
8. Turn the DUT output on.
9. Enter the oscilloscope measurements in the Voltage noise at 20 MHz table for checking noise at
20 MHz.