Schematic for 4-20mA current loop

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Hello!
I need a schema that can source 4-20 mA very precisely.I need this source to simulate the function of a sensor.The accuracy of the source must at least 0.01 mA.
Best regards!

Added after 14 minutes:

I forgot : the current source must be adjustable.
Best regards!
Venix
 

instrumentation 4-20ma

Such a device is called calibrator and is available from many instrumentation manufacturers.

I would design it from a AD420 4-20 mA DAC and an uP (with a keyboard and a display) to control it. The critical analog part is completely represented by the AD420. You can probably get fully analog switch controlled calibrators from surplus.
 
4-20mA Current loop

hi, you can use DAC0808, in output you should buffer by a transistor BJT.
 

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