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Figure 39 shows the complete pinout for the user interface on header J1. Note that pin 1 is
indicated by a small arrow on the ribbon cable connector.
J1
D/A_SEN0
D/A_SEN1
D/A_SEN2
D/A_SEN3
D/A_SEN4
AGND
D/A_SEN5
D/A_SEN6
AGND
D/A_OUT0
D/A_OUT1
GND
D/A_OUT2
D/A_OUT3
D/A_OUT4
D/A_OUT5
D/A_OUT6
D/A_OUT7
AGND
D/A_SEN7
Pin 1
Figure 39. D/A Converter Card User Interface Pinout
The D/A Converter Card has eight analog output channels, D/A_OUT[0–7] , and is also
equipped with a remote sensing capability through sensing inputs D/A_SEN[0–7] for the
voltage-amplifier versions of the D/A Converter Card (models SR9400 and SR9410).
These sensing inputs compensate for the voltage drop across the wire leads of low-impedance
loads to provide a more precise output across the load.
Let’s look at Figure 40 to see how this happens. Assume the load is 500 ? . If the imped-
ance of the wire used to connect the load to the output terminal on the D/A Converter Card
is 5 ? , there will be a voltage drop of about 5 ? /500 ? = 1% across the wire. The voltage
across the load will then be 1% less, which is about 40 counts for the SR9400. By connect-
ing D/A_SEN as shown in Figure 40, the output driver will be able to sense the voltage
drop across the wire and provide a more accurate voltage output across the load. If the
load impedance is much greater than the impedance of the wire leads, simply leave the
D/A_SEN sensing inputs open.
33 pF
825 k W
D/A _SEN[0?7]
?
U10
+
0 W
100 W
5 W
5 W
D/A _OUT[0?7]
500 W
Figure 40. D/A Converter Output for Low-Impedance Loads
User ’s Manual
103
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