I did a brief comparison of my subsequent methods of measuring the tailcurrent of a direct drive 4A flashlight. The subject was a BLF LS D80 (1A, dedomed) with BLF-A6 driver and a Samsung 30Q at 4.06V (so not completely fully charged). I found these currents:
-my Ansman mid-quality DMM with stock leads: 3.01 A
-same Ansman DMM with short thick custom leads: 4.21 A
-voltage over a 0.01 (1%) sense resistor: 46.1 mV
-UNI-T UT210e clamp meter with small device made of 1mm copper sheet: 4.58 A
I made a video of the test, showing how fiddly high current measurements was before the clamp meter, and that the clamp meter with the copper thing was easiest to work with and gave the most consistent result (it will be the device of choice from now on), but that the sense resistor method at least gave the same result, so is accurate as well. The DMM gave too low results even with short thick leads.
Btw, I think my DMM does not work well at the moment, only for a slight moment the correct current displays (I'm sure it gave the normal reading for those moments), most of the time the numbers displayed were all over place while the light out of the flashlight looked fairly constant.
Next time someone new to the hobby asks why they are only getting 2.7A out of their 3A driver, they can be linked to the video to see what difference the leads alone will make.
I agree, that part is not very clear. The answer is that you must contact freeme. If you make a post in freeme’s group-buy thread requesting a PM about that deal you’ll get what you need.
Received mine today. Surprise, had batteries installed. not so good surprise: Chinese instructions & Warranty. Fortunately thanks to another poster a PDF is available for download.
Not so good part: thanks to USPS LastClass® Service it took longer to get from New York to Pittsburg than it did to get from Banggood in China to New York.
I found a copper sheet 1mm thick and 11mm wide and bent a simple ring, not as nice as djozz did, but it does the job.
Copper bride and some Samsung INR 18650-30Q will arrive soon, for all flashlights which can handle 3A and more.
Got it today, it is way smaller than I expected.
Did anyone found english user manual? It says on product page that it comes with “English manual” but I only received chinese booklet!
I feel your pain. I ordered mine on February 3 and tracking still says:
“Item is not found at this moment, If necessary, please verify with the package sender and check back later”
I got mine Thursday and had the same “wow it is small!” thoughts. Happy with the meter and used it this evening to teach one of my Robotics team members a little bit of battery care and troubleshooting. It is small enough to ride in my cargo pants pocket during our competition Saturday morning for quick access.