Noise Waveform; Pulse Waveform - Keithley 3390 User Manual

Model 3390 Arbitrary Waveform Generator User's Manual
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.
2.
3.
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 }
NOTE

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
NOTE
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
Wmin
3390-900-01 Rev. C / January 2009
Press the Noise key.
Refer to
Section 4, Setup Basics
and DC offset voltage (Figure
Press the Graph key to view the waveform parameters in the graph mode.
In the APPL:NOIS command, the frequency parameter has no effect, but you
still must specify a value or DEFault for it.
≥
Pulse Width + 1.6 x Edge Time
The waveform generator adjusts the other parameters when necessary to accommodate
the given pulse period.
≤
Pulse Width
≤ ≤
Pulse Width Pulse Period - Wmin
Return to
Section Topics
for configuring common parameters including amplitude
5-6).
≤
Pulse Period - 1.6 x Edge Time
Section 5: Waveform Output Operations
5-5