The :ROSCillator command subsystem controls the reference
oscillator.
Subsystem Syntax
[:SOURce]
:ROSCillator
:SOURce
INTernal
1
EXTernal
1
CLK 10
:AUTO <boolean>
I
ONCE
Comments
H
:ROSC:SOUR
Controls selection of the oscillator to which the
HP
E1440A is to be locked. The parameters have the following
meanings
:
INTernal
The internal crystal reference source is used.
EXTernal
The
HP
E1440A is locked to an external reference
source applied via the BNC connector on the front panel. If no
external reference signal can be detected, then the command is
rejected and an error is generated. The signal toggles to INT if
EXT is specified again when the command is re-programmed.
This default is necessary in case the external source has been
removed.
CLK
10
The
10
MHz
VXIbus mainframe generated reference is
applied via the bus interface.
rn
:ROSC:AUTO
The instrument determines what reference to use
by
the following algorithm:
if external ref is detected, then use EXTERNAL
else
use INTERNAL.
Command Reference
5-25
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