C O M M A N D R E F E R E N C E
Command Reference
7/01
LDC-3700 Series
85
C H A P T E R
4
The LASer:STEP? query is used to read back the LASer STEP value. This value is used to increment or decrement
the selected laser control mode set point by the given amount, when used with the LASer:INC or
LASer:DEC command.
Examples
"Las:Mode:LDI; Las:Step?" −response: 1 means the step size is 0.1 mA (3744B), since Const I
mode is in effect.
"LAS:MODE:MDP; LAS:CALMD 1; LAS:STEP?" −response: 10 means the step size is 0.1 mW,
since Const P mode is in effect.
The LASer:TOLerance command allows the programmer to determine the LASER current
tolerance, and time window for it to occur, in order that the operation complete flag be set after a
"LASer:OUTput 1" command is issued, or the LASER set point is changed.
Parameters
Two <nrf values>; the first represents the LASER current tolerance, in mA, with a range of 0.1 to
100.0 mA; and the second represents the time window, in seconds, with a range of 0.001 to 50.000
seconds.
Notes
The LDC−3700B Series Laser Diode Controller defaults to a tolerance of 10.0 mA for 5 seconds,
unless changed by the LASer:TOLerance command.
If the LDC−3700B Series Laser Diode Controller is operated in P mode, the current tolerance
parameter is not used. Instead a fixed value of 50
µ
A is used for the I
PD
current. A fixed value of 10
mW (LDC−3744B) or 1 mW (LDC−3714B or LDC−3724B) is used for P
PD
power, and only the time
window parameter may be adjusted.
If the tolerance is set too tight it may never be achieved. This is due to the calibration of the set point
and measurement values.
Examples
"Las:Tol 0.5,10" −action: the LDC−3700B Series Laser Diode Controller’s LASER current source will
be in tolerance when the LASER current is within 0.5 mA for 10.000 seconds.
The LASer:TOLerance? query allows the programmer to determine how the LASER current
tolerance is set.
Notes
The tolerance of the LDC−3700B Series Laser Diode Controller LASER current may be used to
delay programming after an "LASer:OUTput 1" command is issued or the set point is changed.
A change of the output into or out of tolerance flag sets a flag in the LASER status event register,
and so entering or exiting LASER current tolerance may be used to generate service requests.
Examples
"Las:Tol?" −response: "0.2,5.0", means the LDC−3700B Series Laser Diode Controller has a
LASER current tolerance setting of 0.2 mA with a time window of 5.000 seconds.
"LASER:TOL?" −response: "1.0,20.0", means the LDC−3700B Series Laser Diode Controller has a
LASER current tolerance setting of 1.0 mA with a time window of 20.000 seconds.
LASer:STEP?
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
LASer:TOLerance
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
LASer:TOLerance?
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
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