l02dcml - Measurements Accuracy—how close the measured...

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Unformatted text preview: Measurements Accuracy—how close the measured value is to the ac— tual value Measured Value — Actual Value °/ = 100 o 6TH)?“ Actual Value if Actual Value 75 O Resolution—the smallest .change that can be measured Precision—repeatability of measurements Range—Difference between the maximum and mini- mum values of the parameter that can be measured Analog Meler Digital Meter Analog lnstrument—A/D Conversion Performed by User Digital Instrument—A/D Conversion Performed by In- strument Calibration—A perfectly calibrated instrument is one that measures the parameter that it is designed to . measure with perfect accuracy, infinite resolution, and total precision. The actual and measured values are the same when the instrument is connected to the system in which the parameter is to be measured. Even if the instrument is perfectly calibrated and the user reads the measured value with infinite resolution there may still be an error in measuring the desired parameter due to meter or instrumentation loading. Meter or instrumentation loading is the alteration of the parameter to be measured by the insertion of the meter or instrument. The instrument or meter may change the parameter being measured to a different value. H ' ' ’ M E Pay, W v -—5 1?; Dc, 9' C4M.go¢—(L A’ 82,64,742 VM (/3 W VAA’ Z \/ VM 4/5 W VAA 1 V, V73 firm/on 01/91.? 57 : 100 V — v V 1” E (:07 v’: EC?) QM RAM+ R2311 R (’70 mung/7 =- -IDo 3" R4+Rm 509% A tool); IDV \oooé. vm HI \ooHCISo7 (00 E = WIZ.5V C97 ‘0 \00 +|00H(150) Ioo+50 IOOHKSO+I00H100>I Sdfllfi Em =__‘Z.S\/ {21:37:50.9a51 R4,, : IDA/LO. v’: Em if... :: 2.787562%23‘2 away, L6: 005,22] 0‘ — _/00 Rt“ 7o /o fo/D" — Rafi-R4, We arm 1 < \ 201/99 7 Zflfjfi‘ An I IOMJ’Z. / ‘x w: 2w<g7vw LBEWJ 3' Mwlczfl 240—7 24 Pl; I S V64 SzzoflqSL/VVU)V1§A=W Om 709m ID 4,220,“):200Q.’ v : ‘1va 020W=—2.o70 IOO+IO+3 gm“ = \ +3\\(l01-/00)= 3.7sz fig“: 2&7. =7 ...
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l02dcml - Measurements Accuracy—how close the measured...

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