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Chapter 4 Remote Interface Reference
Output Configuration Commands
4
FREQuency {<frequency>|MINimum|MAXimum}
FREQuency? [MINimum|MAXimum]
Set the output frequency. MIN selects the lowest frequency allowed for
the selected function and MAX selects the highest frequency allowed.
The default is 1 kHz for all functions. The FREQ? query returns the
frequency setting in hertz for the function currently selected.
• Function Limitations: If you change to a function whose maximum
frequency is less than that of the current function, the frequency is
adjusted to the maximum value for the new function. For example,
if you are currently outputting an 80 MHz sine wave and then change
to the ramp function, the function generator will automatically
adjust
the output frequency to 1 MHz (the upper limit for ramps).
From the
remote
interface, a “Settings conflict” error will be generated and the
frequency
will be adjusted as described.
•
Duty Cycle Limitations
: For square waveforms, the function generator
may not be able to use the full range of duty cycle values at higher
frequencies as shown below.
20% to 80% (frequency <
25 MHz)
40% to 60% (25 MHz < frequency <
50 MHz)
50% (frequency > 50 MHz)
If you change to a frequency that cannot produce the current duty cycle
,
the duty cycle is automatically adjusted to the maximum value for the
new frequency. For example, if you currently have the duty cycle set
to 70% and then change the frequency to 60 MHz, the function
generator will automatically adjust the duty cycle to 50% (the upper
limit for this frequency).
From the remote interface, a “Settings conflict
”
error will be generated and the duty cycle will be adjusted as described.
Function Minimum Frequency Maximum Frequency
Sine
Square
Ramp
Pulse
Noise, DC
Arbs
1 µHz
1 µHz
1 µHz
500 µHz
Not Applicable
1 µHz
80 MHz
80 MHz
1 MHz
50 MHz
Not Applicable
25 MHz
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