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Assembly changes:
- Remove R5, R6
- R105, R118, R131, R144 - change from 10.0k to 35k (+/-10% ok)
- Install wire jumpers from pins 2-3 of JP2-JP9 (8 places).
- Install wire jumper across JP1
Proposed PCB ECOs:
- Add test point for current limit set (R47 etc).
- (Add photodiode readout)
- Add hardware "laser on" indication
- Add low-pass filter on temp sensor inputs
Notes:
Resistor values R105,107,108 set temperature window. Default values wont work. Details depend on thermistor but a good start would be to change them as follows for a modest range around 25 deg C:
Pot R47 sets current limit for laser shutdown.
Laser wont turn on unless the following are true:
I_SHUTDOWN - backplane INTERLOCK must be at 0V (needs connector or resistor if no system controller) EN0/1/2/3 - must be logic ''1' from backplane (pull-down 10k on Laser/TEC) L_SHDN - uC output PD7 must be ''0'
Last modified 10 years ago
Last modified on Nov 8, 2013, 10:17:53 AM