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Chapter 4 Remote Interface Reference
Using the APPLy Command
4
DC Offset Voltage
• For the offset parameter of the APPLy command, you can substitute
“MINimum”, “MAXimum”, or “DEFault” in place of a specific value
for the parameter. MIN selects the most negative dc offset voltage for
the function and amplitude specified. MAX selects the largest dc offset
for the function and amplitude specified. The default offset is 0 volts
for all functions.
•
Limits Due to Amplitude
: 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 50Ω load or 10 volts
for a high-impedance load).
|Voffset| <
Vmax –
If the specified offset voltage is not valid, the function generator will
automatically adjust it to the maximum dc voltage allowed with the
amplitude specified. From the remote interface, a “Data out of range”
error will be generated and the offset will be adjusted as described.
•
Limits Due to Output Termination: The offset limits are determined
by the current output termination setting (the APPLy command does
not change the termination setting). For example, if you set the offset
to 100 mVdc and then change the output termination from 50 ohms
to “high impedance”, the offset voltage displayed on the function
generator’s front-panel will double to 200 mVdc (and no error will
be generated). If you change from “high impedance” to 50 ohms,
the displayed offset will drop in half. See the OUTP:LOAD command on
page 189 for more information.
•
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). The “0” DAC value is still used
as the offset reference even if the waveform data points do not span
the full range of the output DAC.
2
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