COMMAND REFERENCE
Command Reference
7/01 LDC-3700 Series 79
CHAPTER 4
The LASer:LIMit:MDP command sets the laser monitor photodiode power limit value.
Parameters An <nrf value> which represents the laser monitor photodiode power limit, in mW.
Notes When constant MDP mode is used, the output is limited only by the LIM I value.
The LIM MDP condition may be used to shut the LASER output off, but this requires the use of the
LASer:ENABle:OUTOFF command to set bit 3 of the LASER OUTOFF ENABLE register.
Examples "LAS:LIM:MDP 10" −action: sets the laser output power limit to a value which corresponds to
producing 10.00 mW of PD feedback (optical) power.
"Las:Limit:MDp 5" −action: sets the laser output power limit to a value which corresponds to
producing 5.00 mW of PD feedback (optical) power.
The LASer:LIMit:MDP? query returns the value of the laser monitor PD power limit.
Notes The (LASER) MDP limit is in effect for both laser output current ranges.
Examples "LAS:LIM:MDP?" −response: 3.0, means the monitor PD power limit is set to 3.0 mW.
":LAS:Limit:MDP?" −response: 10.0, means the monitor PD power limit is set to 10.0 mW.
The LASer:LIMit:V command sets the LASER compliance voltage limit value.
Parameters An <nrf value> which represents the LASER limit voltage, in volts.
Notes The voltage limit setting is useful for laser protection. When the maximum operating voltage of a
laser is known, the user may set the voltage limit to a value slightly higher than the maximum
operating voltage. Then, if the laser is accidentally disconnected, the current source will quickly
sense the over−voltage and shut off.
In local operation, the voltage limit is entered by selecting the LIM I parameter, pressing and holding
in the (PARAMETER) SET switch, and then pressing the (LAS DISPLAY) V switch. Turn the
ADJUST knob until the desired value is displayed, and then release the SET switch.
Examples "LAS:LIM:V 5.0" −action: the LASER compliance voltage limit is set to 5.0 volts.
":Laser:Limit:V 4.60" −action: the LASER compliance voltage limit is set to 4.6 volts.
The LASer:LIMit:V? query returns the value of the LASER compliance voltage limit setting.
The voltage limit is valid for all modes of Laser operation.
In local operation, the voltage limit is seen by selecting the LIM I parameter, pressing and holding in
the (PARAMETER) SET switch, and then pressing the (LAS DISPLAY) V switch.
Examples "LAS:LIM:V?" −response: 4.5, means the laser compliance voltage limit is 4.5 volts.
"Laser:LIM:V?" −response: 10.0, means the laser compliance voltage limit is set to 10.0 volts.
LASer:LIMit:MDP
COMMON
DEVICE DEPENDENT
FRONT PANEL
LASer:LIMit:MDP?
COMMON
DEVICE DEPENDENT
FRONT PANEL
LASer:LIMit:V
COMMON
DEVICE DEPENDENT
FRONT PANEL
LASer:LIMit:V?
COMMON
DEVICE DEPENDENT
FRONT PANEL
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