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[SENSe[<
chan
>]]:ROSCillator
The SENSe:ROSCillator subsystem controls the reference oscillator source and
frequency used to generate sample rates for taking measurements.
Subsystem
Syntax
[SENSe[<
chan
>]]
:ROSCillator
:EXTernal
:FREQuency <
frequency
>
:SOURce <
source
>
Since the triggering and timebase circuits of the HP E1429 are shared between both
sensing channels, the settings for [SENSe[<chan>]]:ROSCillator are the same for
both values of chan (1 and 2). Setting SENSe1:ROSCillator values will also set
SENSe2:ROSCillator values and vice versa.
:EXTernal:FREQuency
[SENSe[<chan>]]:ROSCillator:EXTernal:FREQuency <frequency> indicates to
the HP E1429 the frequency of an external reference oscillator signal. The
SENSe:FREQuency subsystem uses this value to generate the sample rate when
SENSe:ROSCillator:SOURce is set to EXTernal, ECLTrg0, or ECLTrg1.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
chan
numeric 1|2 none
frequency
numeric 10 KHz through 20 MHz
MINimum|MAXimum
Hz
MINimum selects 10 KHz; MAXimum selects 20 MHz.
Comments • Executable when initiated: No
• Coupled command: Yes. This command is coupled to the commands in the
TRIGger subsystem.
• Indicating an incorrect frequency for an external reference oscillator will cause
the sample rate and trigger delay to be incorrect.
• The amplitude of the external reference signal should be a TTL level:
low = 0.0V to 0.8V, high = 2.5V to 5.0V.
254 Command Reference [SENSe[<
chan
>]]:ROSCillator Subsystem