Measurement Computing USB-3102 - Manual (Page 16)

USB-3102 User's Guide Functional Details
16
Connection with
grounded load Connection with
grounded supply
Grounded
External
Supply
+
IOUTn
AGND
Floating Load
IOUTn
IOUTn+1
IOUTn+2
Floating Load
IOUTn+1
Floating Load
IOUTn+2
IOUTn
AGND
Grounded
Load
IOUTn+1
IOUTn+2
+ Floating Supply
IOUTn+1
Floating Ext.
Supply
+ Floating Supply
IOUTn+1
Floating Ext.
Supply
+ Floating Supply
IOUTn+1
Floating Ext.
Supply
IO
U
T
n
+
2
IO
U
T
n
IO
U
T
n
+
1
IOUTn+1
IOUTn+2
IOUTn
Figure 6. Typical analog current output circuit
Refer to the manufacturer's information for the device being controlled for additional details.
Current Test terminal (ITEST)
The ITEST connection (pin 51) is used with InstaCal to test the functionality of the analog current output
(IOUT) pins. The ITEST connection circuit is shown in Figure 7.
ITEST
IOUTn
Limit one channel
Figure 7. Current output test circuit
Do not test more that one current output pin at a time. The ITEST output is not adequate for application use. It is
intended for test purposes only.