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Old 02-07-2011, 05:51 PM #1
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Default Will this test load work?

go to bottom of page, im almost done with my test load just a few more questions


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Old 02-07-2011, 05:53 PM #2
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Default Re: Will this test load work?

What schematic....?
I don't see any.
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Old 02-07-2011, 06:25 PM #3
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Default Re: Will this test load work?

What test load ?
pg5 where ?
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Old 02-07-2011, 06:48 PM #4
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Default Merged three consecutive posts

haha nevermind, i found my answer and your just gonna send me one anyways jeff!

it was this schematic for setting up a phr, i just wanted to know if it would work for a microboost drive, and i just want to change my driver from 1.37A to 500mA for a 12x diode, and use one single 18650 3.7/4.2v

rog8811's schematic from his website

okay, so here is what i have so far, please let me know if there are any errors



The big block looking thing is a 1ohm resistor, that i got at radioshack, will this work even though its not a little tiny one like the others?





and i just solder each two that are next to each other with a solder bridge to connect them correct?
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Old 02-08-2011, 12:00 AM #5
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Default Re: Will this test load work?

Yes, but first trim the leads nice and short.

That resistor is just fine, but it says 10%, so it can be anything 0.9~1.1Ohm,
But I doubt you could accurately measure it with a normal DMM with 0.1V resolution.
In any case, put the DMM on its lowest setting for resistance, I think 200Ohm, touch
the probes directly one to each other and see what it reads.

Then subtract this value from whatever you measure when you put the probes on the resistor.
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Old 02-08-2011, 12:21 AM #6
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Default Merged two consecutive posts

how about where it says on this picture "connections to test for 803t blu-ray"
do i just solder wires to the actual resistor wires coming out the back? or does it have to touch the copper part on the back of the veroboard also?

and also, this is my multimeter, which i just got yesterday still new to all the settings,i put it on ohms, and it said 1.1 and 1.2 when it settled down and i had my hands steady

also here is what i have so far, will the little "mistake" be harmful to it since theres nothing in that row and the solder blobs are not connecting at all?

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Old 02-08-2011, 12:33 AM #7
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Default Re: Will this test load work?

plus from the driver -> the dangling lead of the first diode,
minus from the driver -> the dangling lead of the resistor

and your done.

that solder mishap doesn't matter.
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Old 02-08-2011, 12:37 AM #8
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Default Re: Will this test load work?

okay so just solder them to the dangling lead out of the back of the test load anywhere is fine correct?

and also can i just keep my driver hooked up in my host, pop the battery in and turn it on ?

also also just to make sure, i just touch the sides of the resistor with my dmm, doesn't matter which side to which side?

and also, what do i set my dmm to when i have it all hooked up?

also also also,(haha) should i solder the last leg of the resistor and the diode i havent soldered yet also or just leave the legs dangling without soldering them in place?
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Old 02-08-2011, 12:57 AM #9
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Default Re: Will this test load work?

Unless you unsolder one of the range resistors on the driver the bottom of that range setting it is currently set to is approximately 540mA

http://hacylon.case.edu/ebay/laser_d...1%20manual.pdf
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Old 02-08-2011, 01:02 AM #10
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Default Re: Will this test load work?

so it would work just to turn the driver alot to counter clock wise? lol

edit: but still, i would like to learn how to test load and what not
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Old 02-08-2011, 01:12 AM #11
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Default Re: Will this test load work?

I think the image that you posted in the first post answers all of the questions you are asking??



One thing you have to watch out for, is that these silicon diodes are not meant to handle the kind of load that we are setting these days...

I have found that they will last, and not get damaged if you use a 1 second test. Then make adjustment, Then test again for 1 second, and so on...

This is 'trial and error', and maybe a little tricky to get your desired adjustment, but at least you won't fry your test load...
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Old 02-09-2011, 05:22 PM #12
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Default Re: Will this test load work?

Hi Guys,
New kid on the block and I may have missed something, BUT!!! If you set your DMM to measure AMP/mAMP.s and hook it up in parallel with the load resister (as shown), won't you smoke your DMM? Shouldn't the DMM be hooked up in series with the driver (DMM neg (-) Black to the driver LD-, DMM pos (+) Red to the open end of the load resistor (1Ohm) and set to read current)??
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Old 02-09-2011, 05:43 PM #13
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Default Re: Will this test load work?

Oops, sorry. I did not READ the comments at the bottom of the figure (set DMM to read mV (not mA)). My BAD. But,, O.K. ,, why read mV and apply Ohm's law when you have a DMM and can read mA.s directly?
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Old 02-09-2011, 05:49 PM #14
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Default Re: Will this test load work?

You may not want to use that resistor as it is a wire wound type, you can not use a wire
wound type as they have INDUCTANCE and the driver may be dammaged or you may not
get a true reading most likely it can dammage the driver.
you need a NON-INDUCTANCE type resistor
best to look for noninductive, flame proof 1 ohm 1% 1W or 2W or 3W be ready to pay about $3.00-$6.00
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Old 02-09-2011, 05:50 PM #15
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Default Re: Will this test load work?

You can get away with measuring with the DMM in series and in amp measuring mode.
I guess it's mostly about the convenience and security (for the driver) to have a complete
circuit to begin with, not relying on your DMM-probes to complete the circuit...
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Old 02-09-2011, 05:54 PM #16
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Default Re: Will this test load work?

WHAT so your telling him he can just touch the leads of his VOM between the laser diode and the driver, with out making solder connections are you trying to get him to kill his laser diode and his driver

This is not very good advice and I would not listen to it !!!



Quote:
Originally Posted by anselm View Post
You can get away with measuring with the DMM in series and in amp measuring mode.
I guess it's mostly about the convenience and security (for the driver) to have a complete
circuit to begin with, not relying on your DMM-probes to complete the circuit...
__________________
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473nm LRS-0473-KFM-00150-10 158.5mW Lab style
laser used in the making of the latest TRON movie

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520 in a SH-032
Viasho 532nm 500mW
CNI pen 532nm 84mW
The Violet Pip Squeek 45mW

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