Advantech PCI-1723 Especificaciones Pagina 54

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D.1 VR Assignment
There is two variable resistors (VR1 and VR2) on the PCI-1723 to
adjust the accurate reference voltage. We have provided two test points
(See J4 and J7 in Figure D-1) for you to check the reference voltage on
board. Before you start to calibrate the D/A channels, please adjust
VR1 until the reference voltage on J4 has between +9.9995 ~ +10.0005
V. And adjust VR2 until the reference voltage on J7 has between
-9.9995 ~ -10.0005 V. Figure D-1 shows the locations of VR1, VR2, J4
and J7.
Figure D-1: PCI-1723 VR assignment
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