Old 06-09-2010, 09:58 PM #1
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
alanbrito alanbrito is offline
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
Default Help with PHR / rkcst driver build

I have a problem.

I purchased the PH3803T sleds to get the 405 nm diodes from them. I also got the rckstr driver and a test load, all from Modwerx.

Now I do not know what the problem is. I connect the driver to a voltage source to the +/- terminals. The LD+/LD- terminals go to the diode, but instead of the diode, I have the dummy load connected. In the dummy load, I am supposed to measure the voltage across a resistor, where 1mV should be 1 mA; and then change the pot in the driver to adjust for the current that will be given to the diode.

Well, the issue is that I am getting between 1.75 and 2.02 mV through the reistor, that is all the range I get from twisting the screw in the pot in the driver.

Can I get some help? I don't know what's wrong; I thought I'd be getting something like 100 mA/mV. Is the voltage I am using correct? Could it be a bad driver? HEEELP!

PS: I searched for something like this but found nothing... I think I am doing everything right.


alanbrito is offline   Reply With Quote


















Old 06-09-2010, 10:16 PM #2
pseudolobster's Avatar
Class 3R Laser
 
Join Date: Jan 2008
Location: BC, Canada
Posts: 1,734
Rep Power: 487
pseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond repute
pseudolobster pseudolobster is offline
Class 3R Laser
pseudolobster's Avatar
 
Join Date: Jan 2008
Location: BC, Canada
Posts: 1,734
Rep Power: 487
pseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond repute
Default Re: Help with PHR / rkcst driver build

Are you sure your multimeter is set to the correct range? IT should be on the 1v or 2v setting.
What power source are you using? It'll need to be at least 7v, preferably as much as 12v.
Also, what setting is the dummy load set to? There's a jumped labeled red or blue. You'll want to solder a bridge over the blue jumper.
__________________
Custom Text
pseudolobster is offline   Reply With Quote
Old 06-09-2010, 10:19 PM #3
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
alanbrito alanbrito is offline
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
Default Re: Help with PHR / rkcst driver build

Its a digital multimeter, set to mV range, but I get the same under the V range, so that's not it. I do have the rkcstr dummy load... WHat is this about soldering a bridge? There is a red/blu label... I haven't soldered anything there. Please confirm if that's what I need to do... And if so, I'm an idiot.
alanbrito is offline   Reply With Quote
Old 06-09-2010, 10:21 PM #4
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
alanbrito alanbrito is offline
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
Default Re: Help with PHR / rkcst driver build

I am using a voltage/current source from our lab, it is a constant voltage/current power supply, and I can change the voltage; I was testing it with 5V, but even at 12 V I am getting only 6 mV through the test load resistor...
alanbrito is offline   Reply With Quote
Old 06-09-2010, 10:40 PM #5
pseudolobster's Avatar
Class 3R Laser
 
Join Date: Jan 2008
Location: BC, Canada
Posts: 1,734
Rep Power: 487
pseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond repute
pseudolobster pseudolobster is offline
Class 3R Laser
pseudolobster's Avatar
 
Join Date: Jan 2008
Location: BC, Canada
Posts: 1,734
Rep Power: 487
pseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond reputepseudolobster has a reputation beyond repute
Default Re: Help with PHR / rkcst driver build

I can't find my test load right now, but I think if you solder neither of the jumpers, the current doesn't flow through the diodes, making it so the test load is basically just a resistor. Yes, you'll want to solder a bridge over the two dots labeled "blue".
__________________
Custom Text
pseudolobster is offline   Reply With Quote
Old 06-09-2010, 10:45 PM #6
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
alanbrito alanbrito is offline
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
Default Re: Help with PHR / rkcst driver build

I'll wait to hear a confirmation on this; if you're right, you have just prevented me from shooting myself. I need to get this working for an experiment.
alanbrito is offline   Reply With Quote
Old 06-10-2010, 01:10 AM #7
charliebruce's Avatar
Class 3R Laser
 
Join Date: Nov 2008
Location: London, UK
Posts: 1,550
Rep Power: 124
charliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond repute
Send a message via MSN to charliebruce
charliebruce charliebruce is offline
Class 3R Laser
charliebruce's Avatar
 
Join Date: Nov 2008
Location: London, UK
Posts: 1,550
Rep Power: 124
charliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond reputecharliebruce has a reputation beyond repute
Send a message via MSN to charliebruce
Default Re: Help with PHR / rkcst driver build

If the solder bridges are set up correctly (read the test-load manual to confirm this?), then it might be that the load is wired in reverse polarity, that might cause the issue you're describing.
__________________
If I use too many brackets (like this) then just ignore what's inside them...
charliebruce is offline   Reply With Quote
Old 06-10-2010, 01:18 AM #8
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
alanbrito alanbrito is offline
Member
 
Join Date: May 2010
Posts: 47
Rep Power: 0
alanbrito will become famous soon enoughalanbrito will become famous soon enough
Default Re: Help with PHR / rkcst driver build

I guess that's it. I haven't set the solder bridges. Fail.
alanbrito is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 09:43 PM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC