SOURce:FUNCtion:CLOCk:EXTernal:DIVisor
Syntax
SOURce:FUNCtion:CLOCk:EXTernal:DIVisor {<value>|MIN|MAX|DEF}, (@<ch_list>)
SOURce:FUNCtion:CLOCk:EXTernal:DIVisor? [{MIN|MAX}, ] (@<ch_list>)
Description
This command sets an external clock divisor for trace outputs on the specified channels on the 34951A Isolated DAC Module. This provides a way to divide an externally-supplied clock input to a frequency that is usable for outputting trace waveforms. The specified value is used only if the clock source is set to EXTernal (see SOURce:FUNCtion:CLOCk:SOURce command).
Used With:
34951A Isolated DAC Module
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<value> |
Numeric |
Specify any integer value between 1 and 4.0E+9. MIN = 1, MAX = 4.0E+9 |
1 |
|
<ch_list> |
Numeric |
One or more channels in the form (@sccc).
|
This is a required parameter |
Remarks
The valid frequency range for external clock inputs to the module is 1 Hz to 10 MHz.
Since the maximum point-to-point rate for trace waveforms on the 34951A is 200 kHz, you must set the divisor such that the resulting clock input is less than 200 kHz. For example, with an external clock input of 2 MHz, the minimum divisor would be: 2 MHz/200 kHz = 10.
The external clock signal is applied to Pin 24 on the module's D-Sub connector. The external clock input is shared among all four DAC channels (i.e., there are no channel-specific clock inputs available). The valid frequency range for external clock inputs to the module is 1 Hz to 10 MHz.
A Factory Reset (*RST command), Instrument Preset (SYSTem:PRESet command), and Card Reset (SYSTem:CPON command) will reset the divisor to 1. In addition, storing the instrument state (*SAV command) will reset the divisor to 1.
Return Format
The query command returns the clock divisor in the form "+1.00000000E+02" for each DAC channel specified. Multiple responses are separated by commas.
Examples
The following command sets the clock divisor to 100 on DAC channels 1 and 2 in slot 4 (the external clock input signal is divided by 100).
SOUR:FUNC:CLOC:SOUR EXT, (@4001,4002)
SOUR:FUNC:CLOC:EXT:DIV 100,(@4001,4002)
The following query returns the clock divisor in use on DAC channels 1 and 2 in slot 4.
SOUR:FUNC:CLOC:EXT:DIV? (@4001,4002)
Typical Response: +1.00000000E+02,+1.00000000E+02