It is really easy to convert to 4-20mA input on the PL1000 series. You simply add a 120 ohm resistor across the input & 0V of the channel in question. If you use the small terminal board supplied with the PicoLog, there are positions to add 0805 surface mount resistors in the relevant places:-http://www.picotech.com/document/pdf/Sm ... sGuide.pdf
The 4mA current will then generate 480mV at the input and 20mA will generate 2.4Volts. To convert these voltages into properly scaled readings, you must use the "Scaling" option in PicoLog. If, for instance, the output of the transducer is 0% at 4mA & 100% at 20mA, you would set up a look-up table to equate 480(mV) to 0(%) & 2400(mV) to 100(%).
When in the "PicoLog 1216 Measurements" dialog box, click "Edit" for the channel in question.
In the "PicoLog 1216 Edit measurement" box, click "Options"
In the "Parameter options" box, tick "Use Parameter Formatting" and set "Units" to "%", "Formatting" to your own preference and then click "Scaling"
In the "Parameter Scaling" box, set "Scaling method" to "Table look-up".
In the blank box, you can now enter pairs of "Raw" & "Scaled" readings. In this case the table looks like:-
If you click on "Help", there is a good explanation of the process.
Please contact again if you have any questions.