User manual

3390-900-01 Rev. C / January 2009 Return to Section Topics 5-5
Model 3390 Arbitrary Waveform Generator User’s Manual Section 5: Waveform Output Operations
VOLTage:OFFSet {<offset>|MINimum|MAXimum }
FUNCtion:RAMP:SYMMetry {<percent>|MINimum|MAXimum}
Noise waveform
A Gaussian noise waveform with a 20 MHz bandwidth can be generated.
To generate a noise waveform:
1. Press the Noise key.
2. Refer to Section 4, Setup Basics for configuring common parameters including amplitude
and DC offset voltage (Figure 5-6).
3. Press the Graph key to view the waveform parameters in the graph mode.
Figure 5-6:
Setting up a noise waveform
To generate a noise waveform from a remote interface:
APPLy:NOISe [<frequency|DEF>[,<amplitude>[,<offset>]]]
FUNCtion {NOISe}
VOLTage {<amplitude>|MINimum|MAXimum }
VOLTage:OFFSet {<offset>|MINimum|MAXimum }
Pulse waveform
A pulse waveform has a pulse period, a pulse width or pulse duty cycle, an ascending edge, and a
descending edge.
Pulse period / frequency
The default pulse period is 1 ms (or 1 kHz in frequency), and the allowable value ranges from 100
ns to 2000 s (or 10 MHz down to 0.5 mHz in frequency). Pulse period constrains the other
parameters according to the following equation:
Pulse Period
≥ Pulse Width + 1.6 x Edge Time
NOTE The waveform generator adjusts the other parameters when necessary to accommodate
the given pulse period.
Pulse width
The pulse width represents the time from the 50% point of the ascending edge to the 50% point of
the following descending edge. The default pulse width is 100 μs, and the possible value ranges
from 20 ns to 2000 s. The actual allowable range is determined as follows:
1.6 x Edge Time
≤ Pulse Width ≤ Pulse Period - 1.6 x Edge Time
Wmin
≤ Pulse Width ≤ Pulse Period - Wmin
NOTE In the APPL:NOIS command, the frequency parameter has no effect, but you
still must specify a value or DEFault for it.