Yokogawa Button Operated DX2000 Manual do Utilizador descarregar pdf (Página 11)

3. Accuracy and Display Resolution

3.1. Measurement and Display Accuracy (Digital Display)

Computing method of the display value accuracy

¾ Input voltage X

¾ Lower limit of display span VL Upper limit of display span VU

¾ Scale lower limit SL Scale upper limit SU

¾ Digital display value Y

1) Converting equation for the input voltage (setting)

• Y = 10

(SU-SL)*(X-VL)/(VU-VL)+SL

2) Measurement accuracy of input voltage X (uses the negative side due to the

LOG characteristic)

• X

err

=X – (measurement accuracy of the voltage range)

3) Hardware error of the display value

• Y’= Y – Y

err

• The difference from the true value Y is hardware error Y’ when display

value Y

err

corresponds to input voltage X

err

4) Display accuracy of the mantissa

• Display accuracy = Y’* 1.1 + 1 digit

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