Agilent Technologies 34411A Manual do Utilizador descarregar pdf (Página 158)

158 34410A/11A User’s Guide

5 Specifications

Understanding the " % of range " Error The range error compensates for

inaccuracies that result from the function and range you select. The range

error contributes a constant error, expressed as a percent of range,

independent of the input signal level. The following table shows the range

error applied to the multimeter's 24

–hour dc voltage specification.

Total Measurement Error To compute the total measurement error, add the

reading error and range error. You can then convert the total

measurement error to a "percent of input" error or a "ppm

(parts

–per–million) of input" error as shown below.

Error Example Assume that a 5 VDC signal is input to the multimeter on

the 10 V range. Compute the total measurement error using the 90

–day

accuracy specifications: ± (0.0020% of reading + 0.0005% of range).

Reading Error = 0.0020% x 5 VDC = 100 mV

Range Error = 0.0005% x 10 VDC = 50 mV

Total Error = 100 mV + 50 mV =

\150 mV

\0.003% of 5 VDC

\30 ppm of 5 VDC

Range Input Level Range Error

(% of range)

Range Error

(Voltage)

10 VDC 10 VDC 0.0004 ±40 mV

10 VDC 1 VDC 0.0004 ±40 mV

10 VDC 0.1 VDC 0.0004 ±40 mV

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 164

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