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Chapter 3 Features and Functions
Output Configuration
3
• You can set the output amplitude in Vpp, Vrms, or dBm. For more
information, see “Output Units” on page 62.
• You cannot specify the output amplitude in dBm if the output
termination is currently set to “high impedance”. The units are
automatically converted to Vpp. For more information, see “Output
Units” on page 62.
• Arbitrary Waveform Limitations: For arbitrary waveforms, the
maximum 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 amplitude is limited
to 6.087 Vpp (into 50 ohms).
• While changing amplitude, you may notice a momentary disruption
in the output waveform at certain voltages due to switching of the
output attenuators. To prevent this disruption in the output, you can
disable the voltage autoranging feature as described on page 66.
• You can also set the amplitude (with an associated offset voltage)
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 an open circuit. See “DC Offset Voltage”
on the following page for more information.
To select dc volts from the front panel, press and then select the
DC On softkey. Press the Offset softkey to set the desired offset
voltage level.
• Front-Panel Operation:
To set the output amplitude, press the
Ampl
softkey for the selected function. Then use the knob or numeric
keypad to enter the desired amplitude. To set the amplitude using a
high level and low level, press the Ampl softkey again to toggle to the
HiLevel and LoLevel softkeys.
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