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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: The frequency limits are function dependent,
as shown in the above table. If you send a command specifying a
frequency that is not in the appropriate range for the current
function, an error will occur. For example, if the current function is
“ramp” and you send the command FREQ 20 MHz, a “Data out of
range” error is generated and the frequency is set to 200 kHz, which
is the maximum for a ramp waveform.
•
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 <
10 MHz)
40% to 60% (frequency > 10 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 12 MHz, the function
generator will automatically adjust the duty cycle to 60% (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
20 MHz
20 MHz
200 kHz
5 MHz
Not Applicable
6 MHz
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