Signal Generation - The Source Subsystem - Keysight N777 C Series Programming Manual

Signal Generation – The SOURce Subsystem
Command:
Syntax:
Description:
Parameters:
Response:
Example:
Affects:
Command:
Syntax:
Description:
Parameters:
Response:
Example:
Affects:
Keysight N777xC Series Tunable Laser Family Programming Guide
The IEEE 488.2 standard has a list of reserved commands, called source
commands. Some of these commands must be implemented by any
instrument using the standard, others are optional. Your instrument
implements all the necessary commands, and some optional ones.
This section provides the description of these commands.
:SOURce0:AM:COHCtrl:COHLevel?
:SOURce0:AM:COHCtrl:COHLevel<wsp><value>?<wsp>[MIN | MAX | DEF]
Queries the current level of coherence, when using Coherence Control. Coherence is expressed on an arbitrary scale from
1 to 100%. A 100% coherence level corresponds to maximum coherence length and minimum linewidth.
Optional
Returns the currently set excursion level as a percentage between 1 and 100.
:sour0:am:cohc:cohl? -> 1.00000000e+00
N7778C and N7779C
:SOURce0:AM:COHCtrl:COHLevel
:SOURce0:AM:COHCtrl:COHLevel<wsp><value>[MIN | MAX | DEF]
Sets the level of coherence, when using coherence control, on an arbitrary scale from 1 to 100%. A 100% coherence level
corresponds to maximum coherence length and minimum linewidth. The coherence level required for a specific linewidth
and coherence length can vary between modules.
The excursion level as a percentage of its maximum value.
Also allowed:
None
:sour0:am:cohc:cohl 50
N7778C and N7779C
MIN: returns the minimum programmable value (1%)
MAX: returns the maximum programmable value (100%)
DEF: returns the default preset (*RST) value.
MIN: minimum programmable value (1%)
MAX: maximum programmable value (100%)
DEF: default preset (*RST) value.
Measurement Operations & Settings 4
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