Features and Functions
81150A and 81160A User’s Guide 107
3.2.4 DC Offset Voltage
The default offset is 0 volts for all functions.
The relationship between offset voltage and output amplitude is shown
below. Vmax is the maximum peak voltage for the selected output
termination (5 volts for a 50 load or 10 volts for a high-impedance load).
Limits due to
Output Termination
The offset limits are determined by the current output termination setting.
The 81150A / 81160A keeps the configured voltages. However, if this is not
possible, it shows an error message.
Arbitrary Waveform
Limitations
For arbitrary waveforms, the maximum offset and amplitude will be limited if
the waveform data points do not span the full range of the output DAC
(Digital-to-Analog Converter). For example, the built-in “Sinc” waveform
does not use the full range of values between ±1 and therefore its maximum
offset is limited to 4.95 volts (into 50 ohms).
You can also set the offset by specifying a high level and low level. For
example, if you set the high level to +2 volts and the low level to -3 volts,
the resulting amplitude is 5 Vpp (with an offset voltage of -500 mV).
For dc volts, the output level is actually controlled by setting the offset
voltage. You can set the dc level to any value between ±5 Vdc into 50 ohms
or ±10 Vdc into high impedance circuit (1 M).
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