User manual

3390-900-01 Rev. C / January 2009 Return to Section Topics 5-17
Model 3390 Arbitrary Waveform Generator User’s Manual Section 5: Waveform Output Operations
5. Press the Graph key to view the waveform parameters in the graph mode.
To set up PWM from a remote interface:
VOLTage {<amplitude>|MINimum|MAXimum}
VOLTage:OFFSet {<offset>|MINimum|MAXimum}
PULSe:PERiod {<seconds>|MINimum|MAXimum}
FUNCtion:PULSe:WIDTh {<seconds>|MINimum|MAXimum}
FUNCtion:PULSe:TRANsition {<seconds>|MINimum|MAXimum}
FUNCtion:PULSe:DCYCle{<percent>|MINimum|MAXimum}
PWM:INTernal:FUNCtion {SINusoid|SQUare|RAMP|NRAMp|TRIangle|NOISe|USER}
PWM:INTernal:FREQuency {<frequency>|MINimum|MAXimum}
PWM:DEViation {<deviation in seconds>|MINimum|MAXimum}
PWM:DEViation:DCYCle {<deviation in percent>| MINimum|MAXimum}
PWM:SOURce {INTernal|EXTernal}
PWM:STATe {OFF|ON}
Frequency sweep
Frequency sweep allows a waveform to gradually step from one frequency to another at a
specified rate. The waveform can sweep up or down in frequency with logarithmic or linear
spacing. Sine, square, ramp, and arbitrary waveforms work with frequency sweep.
Sweep mode
The waveform generator has two sweep modes:
• Linear: The frequency steps with spacing calculated in a linear function.
• Logarithmic: The frequency steps with spacing calculated in a logarithmic function.
The default sweep mode is linear.
Setting frequency sweep range
You may specify start and stop frequency settings, or a center frequency and frequency span.
Start frequency and stop frequency
The waveform generator sweeps from the start frequency to the stop frequency. The instrument
will sweep down when the start frequency is greater than the stop frequency. The instrument will
sweep up when the stop frequency is greater than the start frequency.
The default start frequency is 100 Hz and the default stop frequency is 1 kHz. The allowable range
is 1 μHz to 50 MHz for sine; 1 μHz to 25 MHz for square; 1 μHz to 200 kHz for ramp; and 1 μHz to
10 MHz for arbitrary waveforms.
Center frequency and frequency span
The waveform generator sweeps from the center frequency through the distance of the
frequency span. Set a positive frequency span for sweeping up and a negative frequency span
for sweeping down.
The default center frequency is 550 Hz. The allowable range is 1 μHz to 50 MHz for sine; 1 μHz to
25 MHz for square; 1 μHz to 200 kHz for ramp; and 1 μHz to 10 MHz for arbitrary waveforms. The
default frequency span is 900 Hz. The allowable range of the frequency span is dependent on
center frequency setting and waveform selection.
Sweep time
The sweep time is the period of time (in seconds) required to sweep from the start frequency (or
center frequency) to the stop frequency (or the endpoint of the frequency span). The number of