User`s manual

:SOURce
[SOURce:]ROSCillator:SOURce <source> selects the reference oscillator source.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
<
source> discrete CLK10 | ECLTrg0 | ECLTrg1 |
EXTernal | INTernal[1] | INTernal2
none
Comments • The available sources are:
– CLK10: The VXIbus CLK10 (10 MHz) line.
– EXTernal: The Agilent E1445A’s front panel “Ref/Sample In” BNC.
– ECLTrg0 and ECLTrg1: The VXIbus ECL trigger lines.
– INTernal[1]: The internal 42.94967296 MHz oscillator. Using this oscillator in
conjunction with the
[SOURce:]FREQuency[1] subsystem gives a resolution of
.01 Hz for sine waves and arbitrary waveform sample rates.
– INTernal2: The internal 40 MHz oscillator. Using this oscillator in conjunction
with the
[SOURce:]FREQuency2 subsystem allows that subsystem to exactly
produce frequencies such as 1, 5, 10, and 20 MHz for arbitrary waveform sample
rates.
• The reference oscillator is used to generate the sample rate and waveform
frequencies specified in the
[SOURce:]FREQuency[1] and [SOURce:]FREQuency2
subsystems.
• Use [SOURce:]ROSCillator:FREQuency:EXTernal to indicate the frequency of an
external reference oscillator.
• Executable when Initiated: Query form only
• Coupling Group: Frequency
• Related Commands: [SOURce:]ROSCillator:FREQuency:EXTernal,
[SOURce:]FREQuency[1] commands, [SOURce:]FREQuency2 commands
• *RST Condition: SOURce:ROSCillator:SOURce INTernal1
Example Setting the Reference Oscillator Source
ROSC:SOUR CLK10 Selects VXI CLK10 line as oscillator source.
[SOURce:]ROSCillator
Chapter 8 Command Reference 371