XPost: sci.electronics.equipment
From: CFKinsey@military.org.jp
On Tue, 30 Jun 2020 04:52:44 +0100, Cydrome Leader
wrote:
> In sci.electronics.equipment Commander Kinsey
wrote:
>> On Wed, 24 Jun 2020 21:06:04 +0100, Rich wrote:
>>
>>> In sci.electronics.equipment Commander Kinsey
wrote:
>>>> On Thu, 18 Jun 2020 15:38:46 +0100, Pimpom wrote:
>>>>
>>>>> On 6/18/2020 6:33 PM, Commander Kinsey wrote:
>>>>>> I just bought an amp clamp meter, and it states the error is "+/-
>>>>>> 1.9% + 3 digits". What does the "3 digits" part mean?
>>>>>>
>>>>>
>>>>> If your meter should read, say 1.875 A, the correct reading could
>>>>> be anywhere from 1.872 to 1.878. This is a possible error in the
>>>>> display presented to you in the analog-digital display conversion
>>>>> process. The +/-1.9% possible error is about the measurement
>>>>> taken including - but not only - any error made by the sensor.
>>>>
>>>> Thanks, I wonder why all my other meters only list a % error. Is it
>>>> included within it somehow, or are they just lying, or do some meters
>>>> not have this error?
>>>
>>> One generally finds the percentage plus digits error measures on more
>>> expensive equipment. Less expensive equipment more often than not only
>>> lists a percentage and nothing more.
>>
>> So should I assume the cheaper ones are lying? Or have they just made a
rough estimate adding the two errors?
>
> might be both. I dug out my first DMM, a Wavetek DM2, circa 1990s. It might
> have been from a raffle or something like that.
>
> The DC voltage specs range from 0.8% +1 digit (not bad really) over to the
> AC ranges which are "1.2% RDG +10 Digits".
TEN!? Surely that's more than the number of digits it has? In which case it
has no accuracy at all.
> If I had new leads, I'd trust it
> with outlet voltage, but would stay away from 208volts.
You oughta complain about that low voltage. Some equipment needs at least 220.
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