HP 8168E - Page 89

5
[:SOURce]:AM:INTernal:FREQuency?
Syntax [ :SOURce ] :AM:INTernal:FREQuency? [ MIN j DEF j MAX ]
Description This query returns the frequency of the amplitude modulation,
as a oating point number in Hertz. If you specify MIN , DEF ,or
MAX with the query, it will return, respectively, the minimum,
default, or maximum modulation frequency.
Example OUTPUT 724;":AM:INT:FREQ 40.4KHZ"
OUTPUT 724;":AM:STAT ON"
OUTPUT 724;":AM:INT:FREQ?"
ENTER 724;A$
[:SOURce]:AM:SOURce
Syntax [ :SOURce ] :AM:SOURce < wsp > INT j INT1 j INT2 j EXT j 0 j 1 j 2
Description This command chooses the type or source of the modulation of
the laser output.
Set the source to INT , INT1 or 0 to select internal modulation,
set the source to INT2 or 1 to select coherence control, or
set the source to EXT or 2 to select external modulation. The
default is for internal modulation to be selected.
Modulation
Input
When external modulation is selected, the signal is modulated
according to the signal applied to the modulation input on the
front panel of the instrument. The maximum signal that can be
applied is 5V
pp
, which results in 15% modulation of the optical
output.
[:SOURce]:AM:SOURce?
Syntax [ :SOURce ] :AM:SOURce?
Description The query returns the current state of modulation.
A returned value of 0 indicates that internal modulation is
selected. A returned value of 1 indicates that coherence control
is selected, 2 indicates that external modulation is selected.
Example OUTPUT 724;":AM:SOUR ON"
OUTPUT 724;":AM:SOUR?"
ENTER 724;A$
Remote Commands 5-19