Teledyne LeCroy PXA125 - Manual (Page 164)

User Manual PXA125
Programming Reference 4-46
ROSCillator:SOURce{INTernal|EXTernal|TCXO}
Purpose
This command will select the reference source for the sample clock generator.
•
selects CLK10 off the backplane of the PXI chassis
•
activates the external reference input. An external reference must be connected to the
PXA125 for it to continue normal operation
•
selects an on-board 1ppm TCXO source. Note that the TCXO is an option, so if you did not
purchase the instrument with the TCXO option, this command will not be available for you to use.
Parameter type
Discrete
ROSCillator:SOURce?
Response and default
The PXA125 will return INT, EXT, or TCXO depending on the present PXA125 setting. Default value is INT.
SWEep:STOP
Purpose
This command will set the stop sample clock frequency. When set to operate in sweep mode, the PXA125
will sweep from carrier sample clock frequency to sweep stop sample clock frequency.
•
will set the sweep stop sample clock frequency for the sweep mode
Parameter type
Numeric
Parameter range
100e-3 to 100e6 in units of samples per second
SWEep:STOP?
Response and default
The PXA125 will return the present sweep stop sample clock frequency value. The returned value will be in
standard scientific format (for example: 1KHz would be returned as 1E3 – positive numbers are unsigned).
Default value is 20e6.
SWEep:TIME
Purpose
This command will set the time it takes for the sample clock frequency to sweep from carrier to stop
frequencies. This parameter will affect the PXA125 only when the instrument is set to operate in sweep
mode.
•
will set the sweep time
Parameter type
Numeric
Parameter range