Some more testing and rambling.
There are some people that don't trust the accuracy of the Opple Light Master III (and I agree it's not the end all, be all) but their argument was that it's not consistent, or is too much off from a $1500 spectrometer. ($30 vs $1500)
And I've been wondering about my Amp readings, because they didn't seem to be consistent. And sometimes readers of my reviews reached out, asking about my Amp measurements. (Not a big fan of showing Amp measurements either, but I sometimes add them).
So I went ahead and did some testing, and oh boy.. I don't know which device I should trust now.
I used an old Fluke 77III (not calibrated) with Fluke probes, a cheap DMM, and a Fluke 325 clamp meter (and its probes).
I'll tell you, the numbers are probably less trustable than the numbers on the Opple Light Master..
I really wish these inconsistancies didn't exist, and I thought having a Fluke (albeit an older one) would be mort trustworthy.
Test: Convoy S2+ with 5 modes (8*7135)
- Fluke 325 clamp meter set to DC amp testing
- Fluke 77 III dmm original probes, set to 10A setting
- Fluke 77 III dmm original probes, set to 300mA setting (for lowest 3 modes)
- Cheap DMM Xiole XL830L set to 200mA (for lowest 3 modes)
- Cheap DMM Xiole XL830L set to 10A
- Fluke 77 III with probes of Fluke 325, set to 10A setting
- Fluke 77 III with probes of Fluke 325, set to 300mA setting (for lowest 3 modes)
Here are the results...
|Mode:||Fluke 325 clamp (DC setting)||Fluke 77III 10A setting||Cheap DMM (10A setting)||77II +325 probes 10A||Fluke 77III 300mA setting||Cheap DMM (200mA setting)||77II +325probes 300mA|
Which would you trust most?
How many DMM's do you have? And why do you trust its readings?
Questions and observations:
Maybe I should clean my DMM contacts (where wires connect to the DMM)? What's the best way to do this?
Calibrating is out of the question at this point, because that's more expensive than just buying a second hand Fluke (in some cases).
It also depends on how strong you push the probes + battery into the flashlight. So there is another inconsistency.
About the clamp meter:
The Clamp meter is slow in reading.. meaning it will first show 0.01, then slowly moves to 0.02, all the way to 0.05.
Also, whenever I turn it on, I have to set it to 0, because it usually shows some current numbers, even though nothing is connected yet.
I bought it to measure high (read 10+) Amps because I don't trust the DMM for that.
But how much can you trust a clamp meter with these smaller currents?
About the Convoy S2+
From what I understood in the past 5-8 years or so, is that each AMC7135 is actually providing 380mAh, instead of 350mA!?!?!?
So, would the clamp meter be more correct, to measure 3.04A instead of the 2.8 from the DMM?
4th mode is somehow unstable with all devices. When I try to measure it, it goes either up or down the moment I connect it. It's much worse that in the other modes. Any explanation?