Mine seems to measure about a half amp low (when measuring 10amps of current) but I’m not sure as I don’t have a calibrated reference. I’m fairly confident my 10ams current is 10 amps as 2 other devices I trust measure it the same. Is there some type of calibration we are supposed to follow with these? I see a button marked “zero”. I pressed that until it beeped while holding it in the air away from electrical devices.
EDIT: In case it matters, mine had the cell or cells installed and ready to run upon receipt.
Disclaimer: I’ve never operated one of these and mine is still in the mail. The zero is to combat stray magnetic fields. Zero it in place with no current flowing. Do not physically move anything while it’s in operation after it’s been zero’ed.
Correct, and that zero-ing in position in the measuring set-up is really needed, can easily make half an amp difference.
For my emitter tests, the current used was always the current read-out of my the power supply as it measures within 0.1A of two other ways to measure current (DMM and 0.01 Ohm sense resistor). On my last led-test I used the clamp meter current instead because it gives an extra digit which makes it easier to set the current. The clamp meter reads consistently 0.1A less than my power supply from 0 to 8A, which is pretty ok I think. I have the feeling that my power supply is more wrong than my clamp meter, but that is just a feeling
When mine arrived, it didn‘t have any loose battery. So, I thought that the battery was missing, like I had read about buyers’ experiences elsewhere.
I picked a pair of Duracell 9V batteries at Home Depot for $8.48 (inconveniently located in a side aisle away from the main battery showcase that prominently featured a single Eveready 9V battery “on sale” for $10.23 :-/ ). Devious of them to try and market the more expensive battery!
When I got home and opened up the battery storage compartment I was surprised to find a generic 9V battery sitting there in a brand new cellophane wrapper.
I thought I had outwitted the folks at Home Depot, but the only person I ended up outwitting wss myself. $-)
EDIT: Senior moment. :-x
The item I was thinking about was my new 1330B luxmeter, not the Uni-T. The clamp-meter came with batteries installed and in working condition.
My two came in recently. I’ve played with them some for measuring DC current and I’m happy. No surprise there, lots of other members have already been happy with theirs. I used them to compare the input(dc)/output(ac) currents from a couple of HID ballasts and they seemed to work nicely. Other (dc) current measurements have also been inline with my expectations.
I didn’t receive any batteries with mine so I used what I had on hand, Energizer Advanced Lithium.
Mine arrived; no batteries either, but I had some in a box. It works and I’m pleased.
This was the longest shipping interval I have run into though. Ordered Jan. 26, shipped Jan. 27. Strange thing occurred though. In late February the tracking number changed! That original # has disappeared from the tracking systems.
Same thing happened with my order. I contacted BG asking why it was taking so long. They replied saying that they had to re-ship and gave me a new tracking number. It arrived a short time later. All is good now. $hit happens I guess…