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4.3 Current Output and Range Control
The current output is implemented by a precision voltage-to-current
converter XTR110. The current output channel n (An) is control by
the voltage of channel n (Vn). The block diagram of the current output
channels is shown in Fig 4.1.
V n
C u r r e n t O u t p u t
R a n g e C o n t r o l
The PCI-6308A provides an on board +15V power supply. Each
current output channel is a current source, which is controlled by the
voltage of the corresponding voltage output channel. For example,
voltage output channel 3 control the current source channel 3.
The output current range is programmable. All the 8 current channels
on PCI-6308A are controlled by current range control register. There
are three kinds of output current range. Refer to the following table
and
Section
_6308_I2V_Control function.
4.4 Isolated Digital Output
O n B o a r d + 1 5 V
5 0 O h m
X T R 1 1 0
A n
A . G N D
Figure 4.1 Current output circuit
5.2.9
for
Input Voltage
Mode
Range
0
0~10V
1
0~10V
2
3
0~10V
E x t e r n a l L o a d
Io
( R e s i s t e r R
programming
the
Output Current
0~20 mA
5~25 mA
--
4~20 mA
Operation Theorem • 19
= 2 5 0 O h m t y p i c a l )
L
current
range
Range
--
by
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