User`s manual

:SOURce
[SOURce:]PM:SOURce <source> selects the source for phase modulation data.
Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
<
source> discrete DPORt | INTernal | LBUS | VXI none
Comments The available sources are:
– DPORt: The Agilent E1445A’s front panel “Digital Port In” connector.
– LBUS: The VXIbus local bus.
– INTernal: The [SOURce:]PM[:DEViation] command.
– VXI: The VXIbus data transfer bus.
• When the source for phase deviation data is the VXIbus data transfer bus, the least
significant byte of the data should be written either in the least significant bits of a
word to offset 176 decimal (B0 hex). The most significant byte should be written
in the least significant bits of a word to offset 178 decimal (B2 hex). After both
bytes are written, a word write of any data to offset 138 decimal (8A hex) is
required to activate the new phase deviation.
• Phase deviation may be changed at a maximum rate of one change every 5
reference oscillator cycles or 2 MHz, whichever is less.
• Executable when Initiated: Yes
• Coupling Group: Frequency
• Related Commands: [SOURce:]PM[:DEViation], [SOURce:]PM:STATe
•
*RST Condition: SOURce:PM:SOURce INTernal
Example Setting Modulation Source
PM:SOUR DPOR Sets “Digital Port In” connector as
modulation source.
[SOURce:]PM
366 Command Reference Chapter 8