18
PHOTODIODE CONFIGURATION
PD Range:
Select the operating range for the photodiode.
The three options are 500 μA, 5 mA, 10 mA. Choose the
range that optimizes the dynamic range of the photodiode.
PD Transfer Function (W/mA):
Set the transfer function that
scales the photodiode current to power. Units are W/mA and
the range is 0 to 0.1.
PD Bias Enable:
This boolean control sets whether the
photodiode bias voltage is on (TRUE) or off (FALSE).
LIMIT PARAMETERS
Laser Current Limit (A
or
mA):
Set the current limit for the
laser. Limit is model-dependent.
Laser Voltage Limit (V):
Set the voltage limit for the laser in
Volts.
LD In Current Limit:
This indicator is lit if the laser driver is
operating in a current limit condition.
Time Delay Prior to Enabling LD Current (msec):
Sets
the delay time in milliseconds between when the output on
command is sent and when output is enabled. Range is 0 to
30000 ms.
TOLERANCE & CABLE RESISTANCE
Laser Current Tolerance:
Defines the current window for
the output to be considered in tolerance. Range is 1 mA to
instrument maximum.
Laser Time Tolerance (sec):
Defines the time window for
the output to be considered in tolerance. Range is 0.1 to 50
seconds.
Laser Cable Resistance (Ohms):
Set the resistance for the
cable connection to the laser in Ohms. Range is 0 to 4 Ω.
SHUTDOWN LASER UPON
Set any of these controls to TRUE to trigger laser current
shutdown if the described condition exists. Any combination
of TRUE controls is acceptable.
