USB to 4-20ma?
Posted 19 May 2008 - 03:36 PM
If that is not acceptable, and you actually need current outputs, then
a reasonable way to do your own voltage to 4-20 mA conversion is with
the circuit shown in Figure 3 of the following app note:
We have used this simple circuit ourselves.
A nice COTS solution to convert the voltage outputs from the LabJack into current outputs might be the 5B39-01 or 5B39-03 from Analog Devices ($125):
One key advantage is that these are isolated, which is often important in typical 4-20 mA applications.
If you go with these, you might want some sort of backplane for mounting like the 5B03 or 5B04:
Posted 19 May 2008 - 04:46 PM
Posted 20 May 2008 - 07:21 AM
Posted 20 May 2008 - 08:17 AM
Posted 20 May 2008 - 09:02 AM
DAQFactory Express should be able to do everything you need. Go to daqexpress.com for more info, and start by looking at the quick tutorial and DF-LJ app guide:
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