NuDAQ PCI-6308 Series, Руководство пользователя

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Operation Theorem
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4
Operation Theorem
In this chapter, the detail operation theorem of PCI-6308V and PCI-
6308A is described. Before programming or applying the PCI-6308
cards to your applications, please go through this chapter to
understand the features of the functions.
4.1 Voltage Output
There are 8 voltage output channels for PCI-6308V and 6308A. For
voltage output operation, you have to understand:
1. How to set the voltage output range.
2. The DA data format.
4.1.1 Voltage Output Range Selection
The DA converters used on the PCI-6308 are Burr-Brown
DAC4814AP. This DAC is 12 bits resolution with bipolar or unipolar
output. The voltage output range is jumper selectable by JP1~JP8.
Please refer to section 2.7 for detail of the jumper setting. The
selectable range is +/-10V, 0~+10V and 0V ~ user defined voltage.
The user-defined voltage is input from the DB-37 connector’s pin #6.
4.1.2 DA data format
The DA data format is 12-bits unsigned value for all channels, that is,
the value is in binary format. The digital value range from 0(0X000) to
+4095(0xFFF) is corresponding to full span of th e output range, which
is setting by jumper. Table 4.1 shows the relation between the digital
value and the analog output voltage.