ILX Lightwave LDX-36000 Series User Manual page 128

5
C H A P T E R
LASer:PPD?
Action
Parameters
Notes
Examples
LASer:PW?
Action
Parameters
Notes
Examples
LASer:PWF <nrf value>
Action
Parameters
Notes
Examples
112
 LDX-36000 Series
C O M M A N D R E F E R E N C E
Command Reference
Returns the measured external photocurrent in units of Watts.
None.
If a photodiode responsivity has been entered via the LAS:CALPD command, the
LAS:PPD? query will return the measured photocurrent in terms of Watts. If the
responsivity value has been set to zero, the query will return a value of zero Watts.
"LAS:CALPD 3.5; LAS:PPD?" -response: "2.75" photodiode responsivity has been set to
3.5 mA/W and the measured optical power returned is 2.75 W.
"LAS:CALPD 0; LAS:PPD?; LAS:IPD?" -response: "0; 9.625E-3" measured optical
power is zero Watts due to responsivity being set to zero and measured photocurrent of
9.625 mA assuming the same 2.75 W input as from the example above.
Returns the QCW pulsewidth setpoint in milliseconds.
None.
Pulsewidth queries are only valid when operating in QCW-Pulse, QCW-Trig, or Hard
Pulse modes.
"Laser:PW?" -response: "10.05" means the QCW pulsewidth is set to 10.05 ms.
Specifies the constant frequency QCW pulsewidth.
An <nrf value> specifying the output current pulsewidth in seconds.
When the pulsewidth is specified using the LAS:PWF command, the duty cycle will
change as required to maintain constant frequency.
If the new value for (command specific parameter) forces the duty cycle or frequency
beyond the operational range of the instrument, the (command specific parameter) will
be clamped to a minimum or maximum value that still allows operation. You may query
the command to determine if the setpoint was out of range.
Changing the pulsewidth is only effective when the instrument is in either QCW-Pulse,
QCW-Trig, or Hard Pulse modes. If an attempt to change pulsewidth is made in any
other mode, the command will be ignored.
"LAS:MODE:PULSE; LAS:F 100; LAS:PWF 95e-3; LAS:DC?" -action: places instrument
in QCW-Pulse mode with a frequency of 100 Hz and a pulsewidth of 950 s. Duty cycle
query returns a value of 9.5%.
C
OMMON
F P
RONT ANEL
D D
EVICE EPENDENT
C
OMMON
F P
RONT ANEL
D D
EVICE EPENDENT
C
OMMON
F P
RONT ANEL
D D
EVICE EPENDENT