Features and Functions
81150A and 81160A User’s Guide 105
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) for 81150A.
While changing amplitude, you may notice a momentary disruption in
the output waveform at certain voltages due to switching of the
output attenuators. The amplitude is controlled, however, so the
output voltage will never exceed the current setting while switching
ranges. To prevent this disruption in the output, you can disable the
voltage autoranging feature as described in the Voltage Autoranging
section.
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 a high impedance circuit. See “DC
Offset Voltage” on the following page for more information.
The available Range for 81150A is:
±5V into 50 (10V into 1 M ) for the max. bandwidth amplifier.
±10V into 50 (20V into 1 M ) for the max. amplitude amplifier
The available Range for 81160A is:
±5V into 50 (10V into 1 M )
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 High and Low softkeys.
To select dc volts, press and then select the DC Mode
softkey. Press the Offset softkey to set the desired offset voltage
level.
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