The 1 MOhm range is quite noisy, and 10 MOhm is way off:
It has a 5 MOhm and 50 MOhm range. According to the manual, the 50 MOhm range has a +/-1.2% accuracy. Looks like your meter has a +1.9% error in this range. I wouldn't say that's way off, but technically you are right, looks like it doesn't meet the specification.
Bruchsal, Germany.
The international shipment has been processed in the parcel center of origin
For the rest of you (waiting from Welectron), do you see the parcel being processed daily? Mine is atCode: [Select]Bruchsal, Germany.
The international shipment has been processed in the parcel center of origin
Since Wednesday.
For the rest of you (waiting from Welectron), do you see the parcel being processed daily? Mine is at
For the rest of you (waiting from Welectron), do you see the parcel being processed daily? Mine is atCode: [Select]Bruchsal, Germany.
The international shipment has been processed in the parcel center of origin
Since Wednesday.
yes
mine is "out for delivery" with DHL express
mine is "out for delivery" with DHL express
Yours was sent with DHL express?
That's both a bad indicator, that there is something fishy.. others also already reported about that instability of these Ohm ranges.
I've never heard of bandguarding ratio and a few Google searches also turn up nothing.
[Edit] From the context it sounds like either Test Accuracy Ratio or Test Uncertainty Ratio (found on a metrological page)
Auto-range broken on V1.22
At work I'm measuring resistance and the auto-range cycles for ever. If I remember correctly there was an issue with this in the past and it was fixed with firmware change
In my case there is a capacitor that gets charged when measuring resistance. I did the same test with a Fluke in auto-range with no problem
Any comments ?
David DLC
I'm doing some tests and i have some trouble with the uA range.
I set up a basic led circuit and measured the current on the mA range and the probe inserted into the A/500mA socket, the led is powered on and i measured 9mA.
I switched the range into the uA range and the probe into the mA/uA socket but the led does not power on and nothing is measured on the meter. I checked the 400mA fuse and there is no continuity... fuse blown?? I think that this range should measure 9mA..
Here we go,
I have compiled the basic accuracy verification, (comma used for the decimal point.)
All ranges are very well inside the (barn door wide) specification, mostly a factor of 10 more accurate than specified.
The linearity of the A/D_1 is quite good, but it shows a very pronounced Rollover Error of about36 digits. I've expressed these both characteristics commonly by the overall DNL, Differential Non Linearity, over the nominal +/- 5.0000 V range, which computes to 2 digits, which is quite OK.
Only the 500k, 5M and 50M Ohm ranges show a strange behavior.
500k and 5M might be quite jumpy all of a sudden, or rock stable the other instance, always with the same physical setup.
The accuracy changes from one day to the other, or from one power-on to the other.
Latter goes also for the 50M range, which integrates much slower; 2 days ago it was out of specification, as it was today morning, but in the afternoon, it was inside spec, but varying from one power-on to the other.
Seems to me, that some internal interference occurs, as if the firmware creates spurious interrupts which affect the readings.
I monitored these different behaviors and will report elsewhere.
Otherwise, that instrument seems to be of very good quality, but not so well specified or qualified by UEI.
I think, that it performs much better, in the same league like other, more expensive DMMs.
Frank
We have tested 10 units now all within spec for 10 M, is there any chance environmental noise made the measurement wobbly? We can test more, but it is going to take some time.