LeCroy LW110 User Manual page 108

Response and default
The LW120 will return SIN, TRI, SQU, PULS, RAMP, SINC, EXP, GAUS, NOIS, or DC depending on the
present LW120 setting. Default value is SIN.
ROSCillator:SOURce{INTernal|EXTernal}
Purpose
This command will select the reference source for the sample clock generator.
•
<INTernal> selects an internal source. The internal source could be either the standard 100 ppm
oscillator, or the optional 1 ppm TCXO
•
<EXTernal> activates the external reference input. An external reference must be connected to the
LW120 for it to continue normal operation
Parameter type
Discrete
ROSCillator:SOURce?
Response and default
The LW120 will return INT, or EXT depending on the present LW120 setting. Default value is INT.
SWEep:STOP<stop_sclk>
Purpose
This command will set the stop sample clock frequency. When set to operate in sweep mode, the LW120
will sweep from carrier sample clock frequency to sweep stop sample clock frequency.
•
<stop_sclk> will set the sweep stop sample clock frequency for the sweep mode
Parameter type
Numeric
Parameter range
<stop_sclk> 100e-3 to 100e6 in units of samples per second
SWEep:STOP?
Response and default
The LW120 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<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 effect the LW120 only when the instrument is set to operate in sweep
mode.
•
<time> will set the sweep time
Parameter type
Numeric
Parameter range
<time> 1e-3 to 1000 in units of seconds
Remote Programming Reference 4-26
User Manual LW120