Check Voltage Noise (20 Mhz - Tektronix Keithley 2281 Series Reference Manual

Appendix B: Verification

Check voltage noise (20 MHz)

Equipment required
Oscilloscope
Electronic load
BNC F-to-Banana cable
To check voltage noise (20 MHz):
1. Plug the device under test (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.
3. Power on the DUT and test oscilloscope.
4. Set up the equipment, as shown in the following figure.
B-42
Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
High current 18 AWG wire
Coaxial cable (BNC M-M)
077114601 / March 2019