Analog Voltage Output Terminals (Vout0 To Vout3); Analog Current Output Terminals (Iout0 To Iout3) - Measurement Computing USB-3102 User Manual

USB-3102 User's Guide

Analog voltage output terminals (VOUT0 to VOUT3)

The screw terminal pins labeled
output range for each channel is software-programmable for either bipolar or unipolar. The bipolar range is
±10 V, and the unipolar range is 0 to 10 V.
Each D/A converter output controls a voltage and current channel pair simultaneously. When you write to a
voltage output, its associated current output is also updated. Each channel pair can be updated individually or
simultaneously.
Leave each pair of unused voltage and current outputs disconnected.

Analog current output terminals (IOUT0 to IOUT3)

The screw terminal pins labeled
for each channel is 0 to 20 mA.
Each D/A converter output controls a voltage and current channel pair simultaneously. When you write to a
current output, its associated voltage output is also updated. Each channel pair can be updated individually or
simultaneously. Leave each pair of unused voltage and current outputs disconnected.
Figure 6 shows a typical analog current output circuit. A minimum of 8 VDC must be available at IOUTn. A
maximum of 36 VDC external excitation voltage is used to power the loop. Consider the drop across the load
when selecting the supply voltage.
A typical application uses a 24 V loop supply. The loop can use either a grounded load where the supply floats,
or a grounded supply where the load floats. Each connection method is shown in Figure 6.
VOUT0 1
IOUT0 2
VOUT2 3
IOUT2 4
AGND 5
NC 6
NC 7
NC 8
NC 9
AGND 10
NC 11
NC 12
NC 13
NC 14
AGND 15
NC 16
NC 17
NC 18
NC 19
AGND 20
DIO0 21
DIO1 22
DIO2 23
DIO3 24
DIO4 25
DIO5 26
DIO6 27
DIO7 28
Figure 5. USB-3102 signal pinout
to
VOUT0 VOUT3
to
IOUT0 IOUT3
29 VOUT1
30 IOUT1
31 VOUT3
32 IOUT3
33 AGND
34
35
36
37
38 AGND
39 NC
40
41
42
43 AGND
44
45
46
47
48 AGND
49 SYNCLD
50 DGND
51 ITEST
52 CTR
53 DGND
54 DIO CTL
55 DGND
56 +5V
are voltage output terminals (see Figure 5). The voltage
are current output terminals (see Figure 5). The current range
11
Functional Details
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC