26
Figure 3-8
•
Limits with amplitude and output termination: DC offset value is
constrained by the equation below:
2
Vpp
Vmax
Voffset
−
≤
where Vmax is the maximum peak voltage allowed for the
selected output termination (5 volts for a 50
Ω
load or 10 volts for
a high-impedance load).
If the specified dc offset is not valid, the waveform generator
automatically adjusts it to the maximum value allowed with the
specified amplitude.
•
Arbitrary Waveforms Limitations: 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.
•
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.
3.7
To Set High-Level and Low-Level Bounds
Setting high-level and low-level bounds provides an equivalent way to
specifying amplitude and DC offset. The procedure is as follows.
Front-panel Operation
1.
Select your desired function by pressing one of the function keys.
2.
Press the softkey under Ampl/High to toggle and make sure the
High is highlighted.
3.
Use the numeric keypad or the knob with cursor keys to change
the value.
4.
Press the softkey under Vos/Low to toggle and make sure Low is
highlighted.
