2021/12/18 07:41
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Laser Controller
Product Manuals - https://www.vescent.com/manuals/
unit. The unit can also be powered through any serial cable with 9-pin D-sub connectors, which is
convenient when the unit must be taken out of line for access to the side panels. The pin outs are
shown in the following figure:
While it is infrequent, the D2-005 power supply may occasionally radiate noise from the side of its
chassis onto nearby electronics. This only occurs in some system configurations, and will appear as a
signal at the frequency of your mains electricity (typically either 50 Hz or 60 Hz). This noise can easily
be removed by moving the D2-005 at least 18 inches (45cm) away from other electronics, rotating it
90° such that the sides of the D2-005 face away, or by moving the entire power supply to a different
shelf. To accommodate this, all D2-005's are shipped with a 5' DB9 cable as of January 1, 2022.
Laser Enable
This key-switch is required to be in the enable position for the laser to turn on. Normally, the key is
left in the enable position.
Remote Interlock
The remote interlock can be used to disable the laser diode output via an interlock control. When this
input is shorted the laser diode output is ON. When the input is open the diode output is OFF. If not
used, leave a shorting cap over this BNC. Once the interlock has been tripped, the laser will stay off
until it is manually reset with the front panel switch.
Setpoint In
SETPOINT IN is an analog input. When the SETPOINT ENABLE is LOW (0 V) the SETPOINT IN voltage
value sets the injection current instead of the front panel dial. For current control boards
VPN00153.12 and higher, zero volts sets zero current and 4 V sets the maximum value of 200 mA
(500 mA for 500 mA version). For current control boards with a lower rev than .12 for the VPN00153,
0 to 6 V is 0 to full-scale current.
This input is rolled off at 14 Hz, which is not much higher frequency than the front panel dial, which
rolls off at 8 Hz, with a second pole at 4 Hz. Therefore, noise can enter the circuit at this point and this
input should be used with caution. It is primarily intended for sweeping the current in order to
measure PI curves and threshold values of laser diodes. We do not recommend using this input for
computer control of the injection current.
Setpoint Enable
