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Old 06-21-2010, 03:49 PM #1
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Default Test load help

Hey there, I wanted to test my test load. so i hooked it up to my ddl driver and measured the current for a blu ray diode.( 6 diodes on the test load )
I got a reading of 600+ mA across the test load resistor. then, WITHOUT touching the pot, I measured the current across the ends of the DDL driver and it showed lower than 600 mA. What's the correct reading?I assume if i use a test load for a LOC diode i will get different reading across the resistor too? Also, can I use the same( 6 diode ) test load for a 445 diode?



Last edited by Elektrotechniker; 06-21-2010 at 04:12 PM.
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Old 06-21-2010, 04:06 PM #2
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Default Re: Test load help

Using 4-6 diodes on a DDL shouldn't matter since the driver is linear. Using the correct number of diodes is more important when working with the flex drives and such. What is important here is your 1 Ohm resistor, and your driver. The reading is supposed to be the one across the resistor.

What do you mean, 'across the driver'?

Have you used this driver on a LD before?

Do you have a picture of your setup?


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Old 06-21-2010, 04:20 PM #3
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Default Re: Test load help

I just wanted to see if my test load works properly before trying it with the flexdrive. measure current across the driver i mean that i measured the current which comes DIRECTLY off it and not across the resistor. Yes i have used this DDL driver with a phr( and still do). Anyway, what do I need to setup the current of my flexdrive for the 445 diode? I had it preset by drlava but i want to make sure it's still the same before it was shipped.
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Old 06-21-2010, 04:26 PM #4
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Default Re: Test load help

Taken from the rckstr driver manual

Quote:
The most accurate method involves directly measuring the current with an ammeter (or
multimeter set to measure mA). Make sure your meter is rated to handle at least
500mA and that the measurement range is within your intended setting.

a. You can directly attach the multimeter leads to the driver output (red to positive,
black to negative) and power up the driver then adjust the pot to set your
current while monitoring the meter.

b. Another method could be to attach a load (ie rectifier diodes, 1N00x series), if
you want to test a specific output voltage, and then connect the multimeter in
SERIES with the load (red lead to positive driver output, black to one end of the
load, the other end of the load connected to negative driver output).

c. Lastly, you can measure the current while connected to a diode by connecting
the meter in series with the INPUT (red lead to battery positive, black to driver
input positive. Or, you can also do series with the negative side). It is slightly
less accurate as the driver does consume a few mA, but should be relatively
close to actual output.

2. The next accurate method is to measure the voltage across a load.

a. The most simple way is to use a 1 ohm resistor (for 1 ohm, at least 1/4W rating
for up to 500mA, 1W suggested) to make calculations simple, but any resistance
is potentially usable, but you should make it under 10 ohms. Connect the
resistance to the output (one lead to positive, one to negative, any direction),
then power up the driver and measure voltage across the resistor. If you are
using 1 ohm, the measured voltage will be equal to the current, so 1mV will be
equal to 1 mA (1mV = 0.001V). If you’re using a resistance other than 1 ohm,
you can calculate your current with Ohm’s Law, by I = V / R, where I is in Amps
(1A = 1000mA).

b. You can also add rectifier diodes in series with the load to simulate a voltage.
The 1N00x series typically have a 0.7V drop per diode, so 4 is about equivalent to
a red diode and about 6 for a Blu‐ray diode (you can measure their voltage drop
and add/subtract diodes if you need more/less voltage).

3. The last method is the quickest, but also least accurate and involves measuring the
setting resistance on the driver. You can estimate the output current by measuring the
setting resistance between points 1 and 2 in the above picture, then calculate the
output current by the equation: Iout = 1.25 / Rset. Iout is in Amps (1A = 1000mA). You
do not need to power up the driver to do this, so it is the simplest method and only
requires a multimeter. But, most meters lose accuracy as you approach the lower end
of its resistance range, so you may not get an entirely accurate reading which will throw
off your calculations. So, do not use this method if you need an accurate reading of
current or need an accurate current setting.
Page 5/6 of the manual
http://sites.google.com/site/rkcstr2...attredirects=0

-Adrian
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Old 06-21-2010, 04:48 PM #5
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Default Re: Test load help

Quote:
Originally Posted by bobhaha View Post
Taken from the rckstr driver manual



Page 5/6 of the manual
http://sites.google.com/site/rkcstr2...attredirects=0

-Adrian
+1 So, can anyone say what's the v drop of a 445 diode so i can use the proper amount of diodes?

Last edited by Elektrotechniker; 06-21-2010 at 04:53 PM.
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Old 06-21-2010, 05:29 PM #6
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Default Re: Test load help

It varies but above 4V is a safe bet unless your running them at just over threshold. There is a thread somewhere with some info but it's lost in the melee at the moment. I'd be looking to use all 6 diodes giving you a voltage drop of ~4.2V to set a 445 diode.

My one runs 4.12V @ 513mA outputting 500mW with a Jayrob 405-G-1 lens but it seems this is quite a good one. Others go as low as 350mW with the same setup and lens and therefore voltage could be different. I don't know if this is due to tolerances of equipment or not but they do seem to vary pretty wildly. I suppose if you're just after a large amount of light from a combination of diodes the batch tolerances can be quite large. Not like needing a specific power in a sled from just one diode.

Hope that's helpful anyway.

M
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Old 06-21-2010, 05:48 PM #7
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Default Re: Test load help

Does this mean that I can use my DDl driver powered by a 9V battery to power my 445 diode, after i have set the current with a 6-diode test load ?
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Old 06-21-2010, 06:22 PM #8
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Default Re: Test load help

-6 Diodes = 4.2V-Drop

4.2 + 2V Dropout of LM317 in Current Regulation Mode
=
>6.2V needed for Power Supply.


Plan on a V-Drop of up to 4.5V across the Laser Diode if you ever take it up to 1A.
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Old 06-21-2010, 06:26 PM #9
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Default Re: Test load help

Thanks a lot!!! I will now connect my 445 diode to the DDL driver set at 350 mA to see the colour then ima put it in the 18650 host to make it handheld Thanks everyone for their help. I will post back if I have more questions about the test load.

Last edited by Elektrotechniker; 06-21-2010 at 06:31 PM.
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Old 06-21-2010, 08:32 PM #10
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Default Re: Test load help

Good Luck Silvershot!

Don't forget to add your data to the Collection Threads in the 445 section!
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Old 06-21-2010, 08:58 PM #11
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Default Re: Test load help

with the rkcstr, i don't use a test load. i set my dmm t the 2 amp setting and it is accurate to .000 spots. so i connect my leads straight to that.

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Old 06-21-2010, 09:01 PM #12
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Default Re: Test load help

Quote:
Originally Posted by chipdouglas View Post
with the rkcstr, i don't use a test load. i set my dmm t the 2 amp setting and it is accurate to .000 spots. so i connect my leads straight to that.

michael
Is the rkcstr a linear driver?
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Old 06-22-2010, 12:31 AM #13
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Default Re: Test load help

yes it is.


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Old 06-22-2010, 02:15 AM #14
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Default Re: Test load help

I bought a test load from rkcstr, and the diodes on it were not meant to handle the kinds of currents that the 445nm laser uses (~750mA), so I could smell the plastic cooking. Those 1N400x rectifier diodes should be able to work well though (use 6 of them in series for a 4.2V drop).
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Old 06-22-2010, 10:59 AM #15
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Default Re: Test load help

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Originally Posted by Bionic-Badger View Post
Those 1N400x rectifier diodes should be able to work well though (use 6 of them in series for a 4.2V drop).
Indeed, that's what I did and it's working fine.
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Old 06-22-2010, 12:58 PM #16
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Default Re: Test load help

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Originally Posted by Bionic-Badger View Post
I bought a test load from rkcstr, and the diodes on it were not meant to handle the kinds of currents that the 445nm laser uses (~750mA), so I could smell the plastic cooking. Those 1N400x rectifier diodes should be able to work well though (use 6 of them in series for a 4.2V drop).
Agree with that it got hot really quick a few sec where can i get these 1N400x Rectifier diodes at Link Pleasethanks
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