Zero-error-converter

  
Single programming resistor Rp provides an output-current range of about six decades.-Note that this resistor`s TC is also a potential source of error; it dissipates 125 mW when JliN ~ 5 V. The maximum deviation is typically 50 nA or 0.0002% of full scale.
Zero-error-converter - schematic

This voltage-controlled current source uses optocoupler IC2 to eliminate an error found in more conventional circuits and which is caused by the output transistor"s base current.




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