| T O P I C R E V I E W |
| Fimax |
Posted - 2011/10/18 : 15:25:52
Edit:
Jag köpte denna mätare
http://www.tonghui.com.cn/en/goods/index/182.html
....................................
Min LCR mätare verkar ha pajat och söker efter en ny. Verkar som om de har blivit billigare sedan jag köpte min (dåliga..). Om man kollar denna verkar den ju rätt schysst och billig.
http://www.ebay.de/itm/DM4070-LCR-Inductance-resistance-capacitance-meter-/160580844722?pt=Mess_Pr%C3%BCftechnik&hash=item25635d3cb2#ht_982wt_1344
Men jag har funderat på om de kanske är bättre att köpa en begangnad "riktig" masking, som tex denna
http://www.ebay.de/itm/HP-4262A-LCR-Meter-/290482868804?pt=Mess_Pr%C3%BCftechnik&hash=item43a220d244#ht_1546wt_1110
Verkar ju vara redig kvalitet, har hittat den samma som ovan, men för 2000kr.
Vad tror ni?
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| 3 L A T E S T R E P L I E S (Newest First) |
| Fimax |
Posted - 2011/10/27 : 03:45:44
Slutade med att jag köpte denna:
http://www.tonghui.com.cn/en/goods/index/182.html |
| Fimax |
Posted - 2011/10/18 : 16:56:41
jag har inte riktigt fattat det där med mätnogrannheten som anges. Resistansnogrannheten i första länken anges ju som ±(0.5%+3).
Menas då om man mäter en 100ohm resistor att nogrannheten är 100±(0.5/100x100+3), alltså 100±3.5?
Är ju inte såå dåligt, men om man mäter en 1ohm resistor blir det ju 1±3.05, vilket inte är så bra..
eller hur ska ma uppfatta det?
Jag måste ha en mätmaskin som klarar att hålla ±1% ocksö i 0.5+1ohm regionen.
EDIT: fick lite info
http://kb.bkprecision.com/questions.php?questionid=19
Q: How do I read accuracy specifications when it shows % reading + counts or % reading + digits?
A: It's common when looking at specifications for meters and power supplies when you see accuracies that are specified by either % of reading + counts or + digits. Before explaining about the meaning of this specification, the resolution must be taken into account because often accuracies are also based on specific resolution or ranges of the instrument.
Suppose a multimeter has an accuracy specification of 0.5% + 10 in the range of 5 V for DC voltage. Assuming it is a 50000 count multimeter, in that range it should be able to read up to 4.9999 V.
Assume the measured reading is 2.0000 V. According to the accuracy on this particular range with this resolution, we take 0.5% of the reading, and add 10 digits or counts to the reading. The digits or counts mean you add to the reading you see on display.
For example, we first take 0.5% of 2.0000 V, which is 10 mV. Adding this with the + 10, the accuracy specification tells us that reading accuracies is between 2.01010 V and 1.99010 V.
The counts are added to the end, based on the resolution of your reading.
The reason why resolution becomes important is because the + digits or + counts are added to the display reading. For example, if the resolution was only 2.000 V instead, taking the same accuracy specifications would mean the reading is accurate between 2.020 V and 2.000 V. Comparing with previous results, clearly they are not the same. The resolution defines how many digits will be displayed, but the + counts or + digits are just values added to the number being displayed. |
| Ryssen |
Posted - 2011/10/18 : 16:20:43
Den på första länken har jag,den har då överlevt de få mätningar jag gjort. |
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LCR Mätare - löst problem
