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Old 03-14-2015, 02:18 PM #1
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Question Test-load and driver's compatibility

Hello,
I own a diode laser 445-450nm (blue) 1W-1.4W, NICHIA NDB7412T,
http://img.alibaba.com/img/pb/953/23...238953_683.jpg
the maximum intensity is 1.2Amax and 5.5Vmax. So I have not taken the driver 1.25A of Survivallasers and bought it 3.7-4.2VDC 1w 1.4w 2w Blue 445nm 450nm Laser Diode Driver Power Supply 2.5A
but I do not know how I assembled a diode. Should I use a test-load and what is it anyway? the adjusting screw to adjust I (out) of the driver?
Thank you for helping me.


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Old 03-14-2015, 03:22 PM #2
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Default Re: Test-load and driver's compatibility

A test load simulates a laser diode so you can safely adjust driver current without risking the laser diode. Always use a test load to set the current on an adjustable driver.
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405nm SkyRay 12X S06J w/450mA microboost - 485mW :|: BDR-209 16X w/700mA microboost 2X in ZeroLasers SkyRay and Chunk hosts
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445nm JetLasers PL-E - ~1.25W (1.32W) :|: 445nm 9mm w/2.4A X-drive Kryton "the Terminator" :|: Blord 501B build - 2.1W
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473nm CNI lab 40mW
520nm NDG700 @1.8A in Cypreus-IIb - 1.04W :|: PL520 w/300mA x-boost in S4 host - 102mW Build here
532nm JetLasers Ti-B - 100mW (151mW)
589nm Dragonlasers Spartan 50mW
638nm Mits in SL C6 host custom build - 677mW :|: Opnext single mode 290mA x-drive in SL Steel C6 host w/ext. copper HS - 230mW
650nm copper module in C6 host - ~300mW (230mW) Build here
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Old 03-14-2015, 03:29 PM #3
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Default Re: Test-load and driver's compatibility

Thank you for your response, I can not directly measure the intensity out without using a test-load? What is a driver adjustment screw (see link)?
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Old 03-14-2015, 04:05 PM #4
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Default Re: Test-load and driver's compatibility

The adjustment screw is how you set the output current. I think you are asking if you need the test load to measure output current. If so, then yes, you can damage the driver if you power it without a load. Using a test load lets you set the output current without risking damage to the laser diode.
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445nm ZeroLaser 2x18650 host 9mm w/2.3A X-drive - 2.8W :|: Trustfire A8 9mm w/2.4A X-drive - "The Sentinel" ~3W
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462nm 9mm diode in ZeroLasers chunk w/1.8A X-drive :|: M462 in sinner Cypreus-II w/microboost
473nm CNI lab 40mW
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532nm JetLasers Ti-B - 100mW (151mW)
589nm Dragonlasers Spartan 50mW
638nm Mits in SL C6 host custom build - 677mW :|: Opnext single mode 290mA x-drive in SL Steel C6 host w/ext. copper HS - 230mW
650nm copper module in C6 host - ~300mW (230mW) Build here
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Old 03-14-2015, 04:10 PM #5
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Default Re: Test-load and driver's compatibility

I wanted to ask if I could directly connect the DMM on terminals + LD and LD-driver without using the Test-load. y-he has a difference with or without the test-load?
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Old 03-14-2015, 04:15 PM #6
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Default Re: Test-load and driver's compatibility

No, directly connecting the DMM can damage the driver. There needs to be something there as a load, this is why test loads exist.
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405nm SkyRay 12X S06J w/450mA microboost - 485mW :|: BDR-209 16X w/700mA microboost 2X in ZeroLasers SkyRay and Chunk hosts
445nm ZeroLaser 2x18650 host 9mm w/2.3A X-drive - 2.8W :|: Trustfire A8 9mm w/2.4A X-drive - "The Sentinel" ~3W
445nm JetLasers PL-E - ~1.25W (1.32W) :|: 445nm 9mm w/2.4A X-drive Kryton "the Terminator" :|: Blord 501B build - 2.1W
450nm Osram PLTB450 in SL S4 host - 1.48W :|: 450nm Osram PL450B with ~280mA microboost in C6 host - 235mWBuild here
462nm 9mm diode in ZeroLasers chunk w/1.8A X-drive :|: M462 in sinner Cypreus-II w/microboost
473nm CNI lab 40mW
520nm NDG700 @1.8A in Cypreus-IIb - 1.04W :|: PL520 w/300mA x-boost in S4 host - 102mW Build here
532nm JetLasers Ti-B - 100mW (151mW)
589nm Dragonlasers Spartan 50mW
638nm Mits in SL C6 host custom build - 677mW :|: Opnext single mode 290mA x-drive in SL Steel C6 host w/ext. copper HS - 230mW
650nm copper module in C6 host - ~300mW (230mW) Build here
650nm module in custom host - ~300mW (224mW) "LiL Red Eye" Build Here

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Old 03-14-2015, 04:24 PM #7
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Default Re: Test-load and driver's compatibility

Thank you.Test-load are resistors grouping is that it? It reduces the actual output current of the diode. I do not understand, because when we go to connect the LED driver, it would be the intensity of the driver who shall succeed to the diode and not the intensity with the Test-load. Sorry if my questions are a stupid.
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Old 03-14-2015, 04:49 PM #8
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Default Re: Test-load and driver's compatibility

A basic test load is a few 1n4001 diodes(plain rectifier) wired in series to a 1ohm resistor. You measure the voltage drop across the resisitor to get the current.

The diodes, the number will vary depending on what laser diode you are simulating, should have roughly the same voltage drop as the laser diode. The voltage dropped by the resistor will be equal to the current.

So if you have 4 1N4001 diodes to simulate a 445nm diode, if you read 1.8V on the 1ohm resistor, the driver would be outputing ~1.8A.

There are test loads for sale on ebay, I think at Survival lasers as well. And in the buy sell trade section.
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405nm SkyLaser PL 300-500 - ~500mW (523mW);| SkyLaser LP 5-80 - 5mW
405nm SkyRay 12X S06J w/450mA microboost - 485mW :|: BDR-209 16X w/700mA microboost 2X in ZeroLasers SkyRay and Chunk hosts
445nm ZeroLaser 2x18650 host 9mm w/2.3A X-drive - 2.8W :|: Trustfire A8 9mm w/2.4A X-drive - "The Sentinel" ~3W
445nm JetLasers PL-E - ~1.25W (1.32W) :|: 445nm 9mm w/2.4A X-drive Kryton "the Terminator" :|: Blord 501B build - 2.1W
450nm Osram PLTB450 in SL S4 host - 1.48W :|: 450nm Osram PL450B with ~280mA microboost in C6 host - 235mWBuild here
462nm 9mm diode in ZeroLasers chunk w/1.8A X-drive :|: M462 in sinner Cypreus-II w/microboost
473nm CNI lab 40mW
520nm NDG700 @1.8A in Cypreus-IIb - 1.04W :|: PL520 w/300mA x-boost in S4 host - 102mW Build here
532nm JetLasers Ti-B - 100mW (151mW)
589nm Dragonlasers Spartan 50mW
638nm Mits in SL C6 host custom build - 677mW :|: Opnext single mode 290mA x-drive in SL Steel C6 host w/ext. copper HS - 230mW
650nm copper module in C6 host - ~300mW (230mW) Build here
650nm module in custom host - ~300mW (224mW) "LiL Red Eye" Build Here

Radiant X4 3.7W LPM
Nospin 5W LPM

Last edited by ChaosLord; 03-14-2015 at 04:49 PM.
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Old 03-14-2015, 04:52 PM #9
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Default Re: Test-load and driver's compatibility

My main question is:
With a diode and a 1.2Amax 1-1.4W driver? how to properly set up the driver for the LED operates at its maximum?
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Old 03-14-2015, 05:09 PM #10
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Default Re: Test-load and driver's compatibility

A test load is the best way to determine that the driver is outputing it's maximum. You could just get a fixed current driver already set to the desired current. Theres an Xdrive/Xboost sales thread in the buy/sell/trade section.

I got an adjustable test load with convenient measurement pads, setting/verifying driver output.
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405nm SkyRay 12X S06J w/450mA microboost - 485mW :|: BDR-209 16X w/700mA microboost 2X in ZeroLasers SkyRay and Chunk hosts
445nm ZeroLaser 2x18650 host 9mm w/2.3A X-drive - 2.8W :|: Trustfire A8 9mm w/2.4A X-drive - "The Sentinel" ~3W
445nm JetLasers PL-E - ~1.25W (1.32W) :|: 445nm 9mm w/2.4A X-drive Kryton "the Terminator" :|: Blord 501B build - 2.1W
450nm Osram PLTB450 in SL S4 host - 1.48W :|: 450nm Osram PL450B with ~280mA microboost in C6 host - 235mWBuild here
462nm 9mm diode in ZeroLasers chunk w/1.8A X-drive :|: M462 in sinner Cypreus-II w/microboost
473nm CNI lab 40mW
520nm NDG700 @1.8A in Cypreus-IIb - 1.04W :|: PL520 w/300mA x-boost in S4 host - 102mW Build here
532nm JetLasers Ti-B - 100mW (151mW)
589nm Dragonlasers Spartan 50mW
638nm Mits in SL C6 host custom build - 677mW :|: Opnext single mode 290mA x-drive in SL Steel C6 host w/ext. copper HS - 230mW
650nm copper module in C6 host - ~300mW (230mW) Build here
650nm module in custom host - ~300mW (224mW) "LiL Red Eye" Build Here

Radiant X4 3.7W LPM
Nospin 5W LPM
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Old 03-14-2015, 05:24 PM #11
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Default Re: Test-load and driver's compatibility

I plug a 1 ohm resistance and 6diode will be compatible with my laser diode?
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Old 03-15-2015, 07:07 AM #12
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Default Re: Test-load and driver's compatibility

Use 1N5400 diodes. They are good for 3A.

The NDB7412T will drop about 4.5V @ 1.25A.

1Ω drops 1.25V @ 1.25A

4.5 - 1.25 = 3.25V

Look at the 1N5400 datasheet.

http://www.diodes.com/datasheets/ds28007.pdf

Fig. 2 Typical Forward Characteristics
Each 1N5400 will drop 0.8V @ 1.25A

We take our number from above.
3.25 / 0.8 = 4 diodes
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