C O M M A N D R E F E R E N C E
LDX-32420 Device-Dependent Command Reference
46
LDX-32420
C H A P T E R
4
The LASer:CALMD command sets the laser's photodiode feedback responsivity, the
CAL PD parameter.
The LASer:CALMD? query returns this setting.
Parameters
Responsivity:, in
A/mW. The range is 0.01 to 100.00.
Notes
If the parameter is set to 0, the LDX-32420 will operate in a constant I
PD
mode, when
Constant P (MDP) mode is selected.
The parameter should be set to 0 for I
PD
operation modes. Otherwise, the value of this
parameter is used to convert between I
PD
and P
PD
values. The units of this parameter are
A/mW.
If this value is 0, the front panel P
PD
will display "-.-” and no P
PD
value can be calculated.
Examples
"LAS:CALMD 0.1" - action: sets the CAL PD parameter to 0.1. Therefore, a measured
PD current of 100
A will equate to an optical power of 1000 mW (1W).
"LASER:CALMD?" - response: 0, means the LDX-32420 is set for operation in constant
I
PD
mode (if P mode is also selected).
The LASer:CAL:LDI command is used to enter the LASER current setpoint,
measurement, and limit calibration mode.
The LASer:CAL:LDI? query is used to determine that the LDX-32420 is ready for a value
to be entered during the calibration cycle of the LASer:CAL:LDI mode.
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 LASer:CAL:LDI is issued, the LDX-32420 will allow calibration of the current
setpoint, 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 setpoint, wherever it is set. If the LASER output is
not on, E516 is displayed.
Examples
"Las:CAL:LdI" - action: the LDX-32420 enters calibration mode for LASER current.
LASer:CAL:LDI?" - response: 1, means the LDX-32420 is ready for the user to enter a
current value via the LASer:LDI command.
LASer:CALMD <responsivity>
LASer:CALMD?
F
RONT
P
ANEL
R
EMOTE
LASer:CAL:LDI
LASer:CAL:LDI?
F
RONT
P
ANEL
R
EMOTE
Summary of Contents for LDX-32420
Page 3: ......
Page 9: ...L I S T O F FIG U R E S vi LDX 32420...
Page 11: ...L I S T O F TA B L E S viii LDX 32420...
Page 17: ...WA R R A N T Y xiv LDX 32420...
Page 41: ...O P E R A T I O N Operating a Laser in Constant Power P Mode 24 LDX 32420 C H A P T E R 2...
Page 57: ...RE M O T E O PE R A T I ON Error Messages 40 LDX 32420 C H A P T E R 3...
Page 103: ...C A L IB R A TI O N A N D TR OU BL E S HO O T IN G Error Messages 86 LDX 32420 C H A P T E R 6...
