COMMAND REFERENCE
Command Reference
64 LDC-3700 Series
CHAPTER 4
Laser Diode Controller will be set to operate in constant P
PD
mode, and the P
PD
set point value will
be in effect.
If this value is 0, the front panel P
PD
will display "˘.˘", and no P
PD
value can be calculated.
Examples "LASER:CALMD?" −response: 0, means the LDC−3700B Series Laser Diode Controller is set for
operation in constant I
PD
mode (if P mode is also selected).
"Las:Calmd?" −response: 1.1, means the LDC−3700B Series Laser Diode Controller is set for
operation in constant P
PD
mode (if P mode is also selected) and the responsivity is set to
1.1 µA/mW. 1.1 µA of photodiode feedback current represents 1 mW of optical power.
The LAS:CAL:CONST? query returns a stored calibration value. It is intended for factory use only.
The LASer:CAL:LDI command is used to enter the LASER current set point, measurement, and limit
(in low bandwidth mode) calibration mode.
Parameters None.
Notes Since the limit circuit is the same for both high and low bandwidth modes, it is only calibrated when
low bandwidth mode is selected.
After this command is issued, the LDC−3700B Series Laser Diode Controller will allow calibration of
the current set point, measurement, and limit (if low bandwidth mode is selected). This procedure is
outlined in Chapter 6.
The calibration defaults to the selected bandwidth setting. Therefore, it is necessary to select the
desired bandwidth (I or I
HBW
), and turn the LASER output on before performing the calibration for
that bandwidth.
Calibration is performed at the current set point, wherever it is set. If the LASER output is not on, E
517 is displayed.
In remote operation, the LASer:CAL:LDI? query may be used to determine if the LDC−3700B Series
Laser Diode Controller is ready for the user to enter a value.
Examples "Las:CAL:LdI" −action: the LDC−3700B enters calibration mode for LASER current.
"Las:Cal:LDI" −action: the LDC−3700B enters calibration mode for L
The LASer:CAL:LDI? query is used to determine that the LDC−3700B Series Laser Diode Controller
is ready for a value to be entered during the calibration cycle of the LASer:CAL:LDI mode.
Notes After this query is issued and a response of 1 is received, the LDC−3700B Series Laser Diode
Controller will be ready for the user to enter a current value via the LASer:LDI command (see
Chapter 6).
Examples "LASer:CAL:LDI?" −response: 1, means the LDC−3700B Series Laser Diode Controller is ready for
the user to enter a current value via the LASer:LDI command.
LAS:CAL:CONST?
COMMON
DEVICE DEPENDENT
FRONT PANEL
LASer:CAL: LDI
I
COMMON
DEVICE DEPENDENT
FRONT PANEL
LASer:CAL: LDI?
I?
COMMON
DEVICE DEPENDENT
FRONT PANEL
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