User manual

5-6 Return to Section Topics 3390-900-01 Rev. C / January 2009
Section 5: Waveform Output Operations Model 3390 Arbitrary Waveform Generator User’s Manual
Where: Wmin is the minimum allowable value determined by the following conditions on pulse
period:
Wmin = 20 ns, if pulse period is
≤ 10 s
200 ns, if 10 s < pulse period
≤ 100 s
2 µs, if 100 s < pulse period
≤ 1000 s
20 µs, if 1000 s < pulse period
Pulse duty cycle
Specifying pulse duty cycle is another way to define a pulse waveform (versus specifying pulse
width). Pulse duty cycle is defined as follows:
Duty Cycle = Pulse Width / Pulse Period x 100%
If the specified pulse duty cycle conflicts with the specified pulse width, or pulse width conflicts with
the duty cycle, the most recently specified parameter will be accepted. The default duty cycle is
10%, and the acceptable range is from 0% to 100% with the following constraints:
DutyCycle
≥ Wmin / PulsePeriod x 100%
DutyCycle
≤ (1.0 - Wmin / PulsePeriod) x 100%
Where: Wmin is the minimum allowable value for pulse width as defined under the
Pulse width topic.
Edge time
The edge time represents the time from the 10% point to the 90% point of an ascending or
descending edge. The default edge time is 5 ns, and the possible value ranges from 5 ns
to 100 ns, with the following constraint on the maximum allowable value:
EdgeTime
≤ 0.625 x PulseWidth
To generate a pulse waveform:
1. Press the Pulse key.
2. Refer to Section 4, Setup Basics for configuring common parameters including frequency/
period, amplitude, and DC offset voltage (Figure 5-7).
3. Press the soft key under Width / Duty to select between setting pulse width or duty cycle.
Use the navigation wheel with the cursor keys to change the value, and then press another
soft key to finish the entry and exit. Or use the numeric keypad to enter a desired value and
then press a unit soft key, or press %, to finish the entry. Press the soft key under Cancel to
cancel the changes.
4. Press the soft key under Edge / Time and use the navigation wheel with cursor keys to
change the value, and then press another soft key to finish the entry and exit. Or use the
numeric keypad to enter a new value and then press the soft key under nsec to finish the
entry. Press the soft key under Cancel to cancel the changes.
5. Press the Graph key to view the waveform parameters in the graph mode.
NOTE You can choose to hold pulse width or duty cycle constant during changes in
frequency. Press the soft key to highlight your selection (Width or Duty), then
enter your frequency value.