C O M M A N D R E F E R E N C E
GPIB Command Reference
02_03
LDC-3926339
59
C H A P T E R
4
The LASER:STEP? query is used to read back the laser setpoint step size. This value is the
amount the setpoint will change in response to a Laser:Inc or Laser:Dec command.
Parameters
None. The response is an <nrf value> of the step amount.
Notes
The step of 1 corresponds to 1.0 mA.
Examples
Laser:Step?-response: 1.0 means the laser step size is 1.0 mA.
The LASER:TOLerance command sets the selected module’s laser control tolerance parameters.
Parameters
Two <nrf values>; the first represents the measurement window, in mA,
µ
A, or mW, depending on
the laser control mode. The second parameter represents the time window, in seconds.
Notes
The range of the first parameter, the tolderance window, is 0.01 to 500.0. The units of this parameter
depend on the control mode. In current mode, the units are mA, in IPD mode the units are
µ
A. If the
mode is constant power (P), the first parameter is in mW. The range of the second parameter, the
time window, is 0.1 to 50.
Examples
“LAS:LDI 750; LAS:TOL 0.5,1; LAS:OUT ON” - action: the laser current will be in tolerance when it
is within 0.5 mA of 750.00 mA for a period of 1.0 second, at which point the In Tolerance bit in the
Laser Condition Status register will be set.
The LASER:TOLerance? query returns the selected module’s laser control tolerance parameters.
Parameters
None. The response is two <nrf values> representing the tolerance parameters. The first represents
the tolerance window, in mA,
µ
A, or mW, (depending on the mode). The second represents the
tolerance duration, in seconds.
Notes
The laser tolerance specification is also used in the laser status event and condition registers, and
may be tested by using the appropriate query.
Examples
“LAS:TOL?” - response: “0.2,1.0”, means the selected module has a laser tolerance window of 0.2
mA, 0.2
µ
A or 0.2 mW (depending on the mode) with a duration of 1.0 seconds.
The MODERR? query returns a list of “module” device and command errors. The “module” errors
are those which have occurred since the last “MODERR?” query. The errors are notated by a
LASER:STEP?
LASER:TOLerance
LASER:TOLerance?
MODERR?
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