Bnc 645 User Manual download pdf (Page 166)

166

command. You can set the dc level to any value between ±5 Vdc into 50

ohms or ±10 Vdc into an open circuit.

VOLTage? [MINimum︱MAXimum]

Query the output amplitude for the current function. The value is returned in the

unit chosen by the VOLT:UNIT command.

VOLTage:OFFSet {<offset>︱MINimum︱MAXimum}

Specify the dc offset voltage. The default is 0 volts. The minimum value is the

most negative dc offset for the chosen function and amplitude and the maximum

value is the largest dc offset for the chosen function and amplitude.

z The output amplitude and offset voltage are related to Vmax as shown

below:

offset| + Vpp ÷ 2 ≤ Vmax

Where Vmax is the maximum peak voltage for the selected output termination

(5 volts for a 50Ω load or 10 volts for a high-impedance load). The function

generator will take the new specified output amplitude, but the offset voltage

may be reduced accordingly, and a “Settings conflict” error is generated.

z When the Output Termination Setting is changed, the offset limits are

automatically adjusted. For instance, when you change the output

termination from 50 ohms to “high impedance”, your offset voltage

doubles, thus it affects your output amplitude, and when Output

Termination has been changed from “high impedance” to 50 ohms, the

offset voltage decreases in half.

z For arbitrary waveforms, if the waveform data points do not span the full

range of output DAC (Digital-to-Analog Converter), the maximum offset

and amplitude will be limited.

z Setting a high level and low level is another way to specify the offset. For

instance, you will have an amplitude of 5 Vpp (with an associated offset

voltage of -500 mV) when you set your high level to +2 Vpp and low level

to -3 Vpp.

VOLTage:OFFSet? [MINimum︱MAXimum]

Query the dc offset voltage for the current function.

VOLTage:HIGH {<voltage>︱MINimum︱MAXimum}

Specify the high voltage level. The default high level for all functions is +50 mV.

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Bnc 645 User Manual Page 166