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90 Digitizers Command Reference Chapter 3
[SENSe:]ROSCillator:SOURCe
[SENSe:]ROSCillator:SOURce INTernal | EXTernal specifies the timebase
source. The default timebase is the INTernal timebase which uses the VXI
CLK10, 10 MHz reference. The EXTernal input is the TTL “Time Base” input
pin on the front panel External Trigger Input (D-subminiature connector)
(right pin column, bottom pin).
E1563A E1564A
(Time Base” input - bottom right pin)
NOTE The EXTernal source requires you also send ROSC:EXT:FREQ <freq>
to specify the frequency of the external timebase.
Comments Timebase Reference: The timebase reference set by SAMPle:TIMer
<interval> is used when the sample source is TIMer (SAMPle:SOURce
TIMer).
Executable when initiated: NO
Coupled command: YES. The SAMPle:TIMer <interval> is set to a period
or interval nearest the old value when source is changed from EXTernal to
INTernal or vice-versa.
Reset (*RST) Condition: INTernal source, freq = 10.0 MHz
[SENSe:]ROSCillator:SOURce?
[SENSe:]ROSCillator:SOURce? queries to determine the timebase source.
Returns either INTernal or EXTernal.