SOURce:FUNCtion:FREQuency
Syntax
SOURce:FUNCtion:FREQuency {<frequency>|MIN|MAX|DEF}, (@<ch_list>)
SOURce:FUNCtion:FREQuency? [{MIN|MAX}, ] (@<ch_list>)
Description
This command sets the frequency of trace waveform outputs for the 34951A Isolated DAC Module. The maximum allowed frequency is for the entire trace waveform and is a function of the time between consecutive trace values (see SOURce:FUNCtion:SAMPle:PERiod command) and the number of waveform points.
Used With:
34951A Isolated DAC Module
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<frequency> |
Numeric |
Desired frequency in Hz. |
The default is a function of the sample period and the number of points in the trace waveform. |
|
<ch_list> |
Numeric |
One or more channels in the form (@sccc).
|
This is a required parameter |
Remarks
If you have not associated a trace name with the specified channels (see SOURce:FUNCtion:TRACe[:NAME] command), the command is accepted but no error is generated if you attempt to set the frequency.
Since the maximum point-to-point rate for trace waveforms on the 34951A is 200 kHz, the maximum output frequency is:
Maximum Frequency = 200,000 / Number of Points
For example, a 1,000-point waveform will have a maximum frequency of: 200,000/1,000 = 200 Hz; a 100-point waveform will have a maximum frequency of: 200,000/100 = 2,000 Hz.This command is valid only with an INTernal clock source (see SOURce:FUNCtion:CLOCk:SOURce command). If the clock source is set to EXTernal or STEP, the specified frequency is ignored.
All of the built-in waveforms are 1 cycle in length (see TRACe[:DATA]:FUNCtion command).
A Factory Reset (*RST command), Instrument Preset (SYSTem:PRESet command), and Card Reset (SYSTem:CPON command) will reset the frequency to its default (a function of the sample period and the number of points in the trace waveform). In addition, storing the instrument state (*SAV command) will reset the frequency to its default.
Return Format
The query command returns the output frequency in the form "+1.00000000E+03" for each DAC channel specified. Multiple responses are separated by commas. If you have not associated a trace name with the specified channels, "+0.00000000E+00" is returned for each channel (no error generated).
Examples
The following command sets the output frequency to 1 kHz on DAC channels 1 and 2 in slot 4.
SOUR:FUNC:FREQ 1000,(@4001,4002)
The following query returns the output frequency on DAC channels 1 and 2 in slot 4.
SOUR:FUNC:FREQ? (@4001,4002)
Typical Response: +1.00000000E+03,+1.00000000E+03