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– Amplitude units cannot be dBm if output termination set to high impedance. Calculating dBm requires finite load
impedance. In this case, units are converted to Vpp.
– You can convert between units. For example, to convert 2 Vpp to Vrms equivalent:
Press [Units] > Amplitude
The converted value is 707.1 mVrms for a sinewave.
Front Panel Operations
Press [Units] > Amplitude.
SCPI Command
[SOURce[1|2]:]VOLTage:UNIT {VPP|VRMS|DBM}
Output Termination
The instrument has a fixed series output impedance of 50 Ω to the front panel channel connectors. If the actual load
impedance differs from the value specified, the displayed amplitude and offset levels will be incorrect. The load
impedance setting is simply a convenience to ensure that the displayed voltage matches the expected load.
– Output termination: 1 Ω to 10 kΩ, or infinite. The default is 50 Ω.
– If you specify a 50 Ω termination but actually terminate into an open circuit, the output will be twice the value
specified. For example, if you set the DC offset to 100 mVDC(and specify a 50 Ω load) but terminate into an open
circuit, the actual offset will be 200 mVDC.
– Changing output termination setting, adjusts displayed output amplitude and offset (no error is generated). If the
amplitude is 10 Vpp and you change the output termination setting from 50 Ω to "high impedance" (OUTPut
[1|2]:LOAD INF), the displayed amplitude doubles to 20 Vpp. Changing from "high impedance" to 50 Ω halves the
displayed amplitude. The output termination setting does not affect the actual output voltage; it only changes the
values displayed and queried from the remote interface. Actual output voltage depends on the connected load.
Keysight EDU33210 Series User's Guide
Vpp
> Amplitude Vrms.
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