Thanks for the feedback JasonWW.
I tried connecting the negative end of the battery with some wire laying around and connected it to where the red lead is touching and it turned on so I assume that’s a correct place to put it?
It didn’t when I did it before. Just keeps showing a negative value from 0.2-0.5mA.
It doesn’t turn on at all. I’m not sure if it’s my lack of knowledge or the DMM is just defective. Voltage measures fine though.
You might have blown a fuse inside or the fuse might be missing on the 10A side.
Keep in mind that DMM are only good for measuring low currents accurately. Above a couple amps they can be off by a lot. For accuracy you want to use a clamp style ammeter. I only use my DMM ammeter for moonlight levels and parasitic drain measurements.
I see, I’ll try opening it up. Thanks for helping me out!
Edit: Confirmed it was a blown fuse. There was 2 inside and swapped it for the one in the micro amp one and its working now. Still need to find a new one though. Thanks Jason!
One thing you learn quick about DMM’s is that you keep your probes plugged into the voltage holes.
When you put the probes in the amperage holes to measure something, put them back on the voltage holes as soon as your done. If you forget and then go measure a batteries voltage, the fuse will blow right away. 
After you do that a few times and have to order special fuses you learn not to do it any more. It’s a real pain in the rear.
No, because “3” already has an intrinsic and local value equal to 1+1+1.
+1 this
This is why I have two DMM’s dedicated to Amp measurements only :person_facepalming:
BTW, those Aneng DMM’s are pretty precice. Considering the price.
I have an Aneng 8004 that’s only used for milli/microAmp/parasitic drain measurement. Compared to a calibrated Fluke DMM, the yA are “only” off by 1-2yA :student:
Anyone having facebook problems atm
I’ve got a couple potentially stupid questions.
1) I’ve got a utorch lantern/bug zapper that takes a 18650. It has a sleeve inside that when removed it looks like it can fit a 21700. Will this break the light? isn’t the voltage the same?
2) Simon already said no, but if I had a convoy m3 that takes one 26500 battery and found a long enough tube to fit two 26500’s would it break the light? why?
Thanks!
1/ 21700 batteries are fairly new, and predominantly used in high-end flashlights. That’s why I think this sleeve is meant to fill the space needed for a 3*AAA battery carrier. Those have a diameter of a bit over 22.6mm.
Edit: a 21700 has the same voltage as an 18650, that does not hurt a bit. But I may be too long to fit.
2/ 2 batteries “in a row” have a voltage of 2*4.2V = 8.4V. You fry the driver when that is built for 1*4.2V.
I bet a 26650 battery may fit
And yes two batteries stacked together results in 8 volts instead of 4 volts
I found the perfect holster for the emisar d4s, I just received it today. It is a pistol magazine/flashlight holster I found at my local academy
Any way I can upload a pic on here to share? I may find the link on academy’s website and copy and paste it but I’d rather show you guys how perfect of a fit it is!!!
thanks everyone! there will be more.
You can’t directly upload photos to BLF. You’ll need to upload them to a photo-sharing site and post a link.
It’s not complicated. Here’s a how-to guide put together by BLF member ‘raccoon city.’
I recommend using imgur.com as the host site. It’s easy and you don’t need to create an account.
Thanks figured it out from another blf member
Guys, I can’t find the answer although I’m pretty sure there is one within BLF “borders”. Hence my post here - I feel stupid asking you for a shortcut instead of making full research.
The question is: how to calculate the size of hotspot at a particular distance?
Let’s say I want a hotspot of diameter =3 meters at a distance of 150 meters. (numbers are taken out from nowhere, so might be odd). Which LED should I choose (de-doming/slicing is within scope of my poor abilities)?
Or the other way round. Let’s say I have Samsung LH351D, how can I know what would be the hotspot size at distance of 150 meters?
Your hints will make my research way easier.
I am by no means an expert but I’d say it’s all up to the reflector or optics. Too many variables to be able to use a simple formula.