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SCPI Commands for the VX4101A
3–16
VX4101A MultiPaq Instrument User Manual
SOURce Subsystem
SOURce:ROSCillator[:SOURce] <source>
SOURce:ROSCillator[:SOURce]:VALue <frequency>
SOURce:ROSCillator[:SOURce]?
SOURce:ROSCillator[:SOURce]:VALue?
Parameter Values
<source> INTernal
<frequency> Calibrated internal source value
Parameter Values
<source> INTernal|CLOCk10|USER1|USER2|USER3|USER4|
USER5|USER6|USER7|USER8|USER9|USER10
<frequency>
DEFault or 9 MHz ≤ value ≤ 11 MHz
N/A
SOURce:ROSCillator[:SOURce] <source>
This command selects the source of the instrument’s 10 MHz reference
oscillator. Valid sources are the VX4101A on-board 10 MHz crystal and the
VXIbus backplane 10 MHz signal. Because you might have more than one
possible backplane source, the VX4101A allows calibration factors for up to ten
back reference oscillator sources (USER1 to USER10) to be stored in non-vola-
tile memory. CLOCk10 is an alias for USER1. When the source has never been
calibrated, then a warning is issued that the source is not calibrated. Sources that
are not calibrated are assumed to be ideal (10 MHz).
NOTE. The Counter uses the 10 MHz signal to drive most of its own control
circuitry. If the backplane 10 MHz signal is selected and no signal is present,
any attempt to use the Counter will result in a communications failure with the
VX4101A. To recover from this state, cycle power on the VX4101A.
Command Syntax
Query Syntax
*RST Value
Limits
Related Commands
Command Description