Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Tutorials, Help & Repairs



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 05-09-2009, 06:21 PM #1
Junior Member
 
Join Date: Jan 2009
Posts: 16
Rep Power: 0
chottu is on a distinguished road
chottu chottu is offline
Junior Member
 
Join Date: Jan 2009
Posts: 16
Rep Power: 0
chottu is on a distinguished road
Question testing diode with mutimeter

Is it possible to test a ld with the diode test function of a multimeter?
If so, can a video or steps be put up as to how to do it?


chottu is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 05-09-2009, 07:17 PM #2
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default

No picture or video but simple enough, set meter to diode test, touch the probes to the + and - pins of the LD, one way round you will get a reading of 1.4 ish, swap the probes and you will get all zeros.
If you get nothing either way it is likely to be a goner, if you get the readings as above the LD MAY work.

Regards rog8811
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
rog8811 is offline   Reply With Quote
Old 05-13-2009, 10:01 PM #3
sk8er4514's Avatar
Class 3R Laser
 
Join Date: Feb 2008
Location: Houston, TX
Posts: 1,809
Rep Power: 76
sk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond repute
sk8er4514 sk8er4514 is offline
Class 3R Laser
sk8er4514's Avatar
 
Join Date: Feb 2008
Location: Houston, TX
Posts: 1,809
Rep Power: 76
sk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond reputesk8er4514 has a reputation beyond repute
Default

I would not trust only using a multimeter to test the diode, I've tested many diodes to not register on the diode test function on the DMM but work great when hooking them up to a laser driver.

It never hurts to try out the diode, especially if you think its already dead, can't kill something if its already dead.

-Kendall
__________________
sk8er4514 is offline   Reply With Quote
Old 05-13-2009, 10:51 PM #4
icecruncher's Avatar
Class 3R Laser
 
Join Date: Jan 2008
Posts: 1,202
Rep Power: 4076
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
icecruncher icecruncher is online now
Class 3R Laser
icecruncher's Avatar
 
Join Date: Jan 2008
Posts: 1,202
Rep Power: 4076
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
Default

Quote:
Originally Posted by sk8er4514 View Post
I would not trust only using a multimeter to test the diode, I've tested many diodes to not register on the diode test function on the DMM but work great when hooking them up to a laser driver.

It never hurts to try out the diode, especially if you think its already dead, can't kill something if its already dead.

-Kendall
2/3 of my grab bag diodes did not pass the DMM test. I think the power rating of the diode may also influence whether this will work or not on just a DMM or a cheap DMM, but I'm not the expert.
icecruncher is online now   Reply With Quote
Old 05-13-2009, 11:25 PM #5
Flaminpyro's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: West central Oregon
Posts: 5,461
Rep Power: 1768
Flaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond repute
Flaminpyro Flaminpyro is offline
Class 4 Laser
Flaminpyro's Avatar
 
Join Date: May 2009
Location: West central Oregon
Posts: 5,461
Rep Power: 1768
Flaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond repute
Default

has anyone ever used an actual diode checker they have different current outputs, seems like one of these mught work very well. if I was at home where mine is I would try it, someont out there get on this !


Pyro...
__________________
White Fusion Time Machine 445
473nm LRS-0473-KFM-00150-10 158.5mW Lab style
laser used in the making of the latest TRON movie

CNI PGL-III-C-589 125mW
520 in a SH-032
Viasho 532nm 500mW
CNI pen 532nm 84mW
The Violet Pip Squeek 45mW

_____________________________________
LOOKING FOR A HOST WITH PERFECT HEAT SINKING
order your C-88 Cu kit today !

Flaminpyro is offline   Reply With Quote
Old 05-13-2009, 11:30 PM #6
pseudolobster's Avatar
Class 3R Laser
 
Join Date: Jan 2008
Location: BC, Canada
Posts: 1,734
Rep Power: 153
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: 153
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

Quote:
Originally Posted by sk8er4514 View Post
I would not trust only using a multimeter to test the diode, I've tested many diodes to not register on the diode test function on the DMM but work great when hooking them up to a laser driver.

It never hurts to try out the diode, especially if you think its already dead, can't kill something if its already dead.

-Kendall
If you're using lavadrives, that's terrible advice. A dead diode killed both of the flexdrives I ever bought, the very first time I used them. Poof, $60 down the drain.
__________________
Custom Text
pseudolobster is offline   Reply With Quote
Old 05-14-2009, 12:44 PM #7
dr-ebert's Avatar
Class 2M Laser
 
Join Date: Mar 2009
Posts: 713
Rep Power: 32
dr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond repute
dr-ebert dr-ebert is offline
Class 2M Laser
dr-ebert's Avatar
 
Join Date: Mar 2009
Posts: 713
Rep Power: 32
dr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond repute
Default

The diode testers on DMMs are designed to deal with the 0.7V drop over common silicium diodes. LEDs and laser diodes, especially BluRay ones, have much higher voltage drops, so the DMM diode testers probably won't work (the voltage they employ can't simply be set to high values, as that may damage a diode if applied in the wrong direction).

I'd be careful with FlexDrives as well.

If you want to test a possibly dead diode, just use a battery or PSU with a series resistor (potentiometer) to limit the current to appropriate (low) values.
__________________
1. Quoting in forums should cost money. There are too many people who blindly quote the immediately preceding post, including already-quoted quotes.
2. Someone who tells others to "use the Search button" without providing a set of reasonably obvious search terms that actually returns the proper answer within the first results page should get banned for a week.

Last edited by dr-ebert; 05-14-2009 at 12:47 PM.
dr-ebert is offline   Reply With Quote
Old 05-14-2009, 02:36 PM #8
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default

It depends a bit on the multimeter. Many will in fact send enough voltage to make the diode work like a diode - often its just the meters battery voltage with a large series resistor. The meters usually display the voltage drop in milivolts though, and many have a range limited to 1999 - which may not be sufficient for laser diodes or leds.

You can test your meter for this behaviour by measuring 2 ordinary diodes in series. It should display double the value of 1 diode. If you hook up 3, its likely to be just at or just beyond the 1999 mV maximum reading.

More expensive meters will likely employ a current source limited to a lower voltage for the diode test.
Benm is online now   Reply With Quote
Old 05-14-2009, 03:21 PM #9
rog8811's Avatar
Class 3B Laser
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
rog8811 rog8811 is offline
Class 3B Laser
rog8811's Avatar
 
Join Date: Jul 2007
Location: Berkshire UK
Posts: 2,749
Rep Power: 193
rog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond reputerog8811 has a reputation beyond repute
Default

I use a fluke auto range meter which has worked on every LD I have ever connected to it..... I must admit I had not thought that cheaper meters might not work.... sorry.

Regards rog8811
__________________
See all of my videos on Vimeo
http://www.vimeo.com/4454150

Lots of tutorials and information on lasers
http://www.rog8811.com/

In the land of the blind the one eyed man..... is most likely holding the laser
rog8811 is offline   Reply With Quote
Old 05-14-2009, 04:17 PM #10
icecruncher's Avatar
Class 3R Laser
 
Join Date: Jan 2008
Posts: 1,202
Rep Power: 4076
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
icecruncher icecruncher is online now
Class 3R Laser
icecruncher's Avatar
 
Join Date: Jan 2008
Posts: 1,202
Rep Power: 4076
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
Default

That's pretty much what I suspected

My harbor freight special doesn't do quite as well as a fluke
But Sam's faqs has a great section on testing unknown diodes. I posted a link in the thread discussing those from the heruusciences grab bag

IIRC, Proper way is with a good regulated adjustable power supply, setting voltage and adjusting cuurent. I'm looking at the mastech 1803d for this.

Quote:
Originally Posted by Benm View Post
It depends a bit on the multimeter. Many will in fact send enough voltage to make the diode work like a diode - often its just the meters battery voltage with a large series resistor. The meters usually display the voltage drop in milivolts though, and many have a range limited to 1999 - which may not be sufficient for laser diodes or leds.

You can test your meter for this behaviour by measuring 2 ordinary diodes in series. It should display double the value of 1 diode. If you hook up 3, its likely to be just at or just beyond the 1999 mV maximum reading.

More expensive meters will likely employ a current source limited to a lower voltage for the diode test.
icecruncher is online now   Reply With Quote
Old 05-14-2009, 04:48 PM #11
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,428
Rep Power: 15904
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default

The fluke might work because it either goes to 3.999 volts which is plenty, or auto-ranges so that 2.00 or more can be displayed.

I would be careful using lab supplies set at some voltage but with current limiting enabled.. some of them have output caps after the current regulating mechanism, and can give your diode a deadly jolt even when configured to safe current levels... similar to output caps on drivers and dodgy diode connections.
Benm is online now   Reply With Quote
Old 05-15-2009, 02:49 AM #12
icecruncher's Avatar
Class 3R Laser
 
Join Date: Jan 2008
Posts: 1,202
Rep Power: 4076
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
icecruncher icecruncher is online now
Class 3R Laser
icecruncher's Avatar
 
Join Date: Jan 2008
Posts: 1,202
Rep Power: 4076
icecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond reputeicecruncher has a reputation beyond repute
Default

Quote:
Originally Posted by Benm View Post
The fluke might work because it either goes to 3.999 volts which is plenty, or auto-ranges so that 2.00 or more can be displayed.

I would be careful using lab supplies set at some voltage but with current limiting enabled.. some of them have output caps after the current regulating mechanism, and can give your diode a deadly jolt even when configured to safe current levels... similar to output caps on drivers and dodgy diode connections.
Point noted.

Here is the link from Sams FAQ on testing unknown diodes

http://members.misty.com/don/laserdio.htm#diodct0
icecruncher is online now   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











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 10:17 PM.


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