Maiman Electronics SF8025, SF8075, SF8150, SF8300
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18. How to get started
Unpack the device. The new device is configured with the following values:
Peltier module current limit (set by digital)
Temperature control (switch TEMP)
TEC temperature set (potentiometer TEMP)
Laser diode driver current set (potentiometer CURRENT)
Laser diode driver current control (switch CURRENT)
Laser diode driver current protection threshold (potentiometer DRV OC)
For the first time we recommended to connect a dummy load. You can use any diodes that
are suitable for the current you want to operate. Dummy load should be connected as load. LD+ to
the anode and LD- to the cathode.
Please don’t turn on TEC if you have not connected a dummy load to the TEC pins.
Connect the controls (analogue and/or digital).
Connect the power supply (note polarity).
18.1. Interlock
The driver has interlock. This is pin 15 of the analog control connector. If you left this pin
open the driver is in the locked state. This pin must be connected to any GND pin for normal
operation.
The driver and the temperature controller can only be turned on with shorted Interlock.
You can also connect something like an emergency button to this pin.
By default at power up the driver is in the "allow interlock" state. Via USB you can set the
driver to the "deny interlock" state. At this case the driver will ignore interlock state and can
operate with opened pin 15.
18.2. NTC Interlock
The driver can only be turned on with installed LD. When driver is turned on without the
installed LD, the operation and measure values will be incorrect! If it is necessary to turn on the
driver without the installed LD, connect 10kOhm resistor to thermistor pins (2nd and 5th) on LD
mount.
18.3. Change the current limit on the Peltier module
If it is necessary, the level of current limit on the Peltier module can be changed before
connecting the laser diode using digital control connection (see paragraph 20).
18.4. Change the current protection threshold of the driver
The current protection threshold level sets with DRV OC potentiometer. The set level can be
seen in the software or requested by a digital command. Set the current protection threshold to
the required level before turn on the laser diode current.
If it is necessary, the current protection threshold can be changed using analog controls.
Make sure that the jumper DRIVER SHORT is installed. CURRENT control selector must be in the
INT position to use the CURRENT potentiometer.
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