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Micro Flex + 803-t Accurate output?

M

matt-12345

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Aug 5, 2008
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Ok, I have this phr-803t diode with the famous micro flex drive by DrLava. I measured the current with a fluke multimeter and I get 98mA. I measured by putting the meter in series between the laser and output of flex drive. I currently don't have the supplies for an official test load. Is this a valid and accurate way to measure output or does the meter interfere and skew the results?
 





M

moond0ggie

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Jul 16, 2008
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Thats probably the most accurate method as your measuring current through the actual
devise in use.
 
G

Glaserfan

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Feb 28, 2008
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If you look on Drlava's site for these drivers, the instructions show you how to measure the voltage across R10 to determine current. This is a more accurate way as it shows actual current to the diode, not the diode+driver.
 
M

matt-12345

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The reading I get does not make since. I get .009 - .010 volts or 9-10 mV.
So does 100 mA = 10 mV or is there something seriously wrong?
Thanks
-Matt
 
K

k-shell

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Sep 5, 2008
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I still like this method for "fine" tweaks:
diodecurrent.jpg


But i use a dummy load when i'm roughing around the mA's.
 
M

matt-12345

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Thanks everyone! I am now confidant of the output.
I was using k-shells method when I found inaccurate readings. My stupid RadioShack meter didn't measure mA properly when I was messing around with LM317T regulators. - I would measure before the regulator 98mA, and after 82mA (with laser diode in series). This made me second guess everything I was doing. I measure with my Fluke, and it gets accurate readings. I measured the resistance of the RadioShack meter (in mA mode) with the Fluke and noticed that it is much higher than the Fluke. When I put the RadioShack one in series, it messed up the current flow.
 
M

matt-12345

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I also noticed something funky. My batteries are starting to get a little low (I think). When I shake the laser around I notice that the dot cuts in and out at a fast rate. Is this normal? I do realize the flexdrive uses some fancy switching technology. I got some pictures!
 

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666DAN

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Jun 18, 2008
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low batteries will do that, my spirograph gets a similar effect when things are dying down :)
 
W

wicked1

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May 18, 2008
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Mine both do that! red and blu... I made several posts in the forum about that driver, and people acted like I was crazy. I couldn't get a good photo of it. I'm glad yours does it too.
 
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