I don't think those are available at 500mA.Use a field-effect current regulator diode! Google for the right type of device.
Here's a quote from the OP:The output impedance is not a measure of the voltage, it is normally a measure of the accuracy of the constant current, ie compare to a constant current source formed by a voltage source and a resistor. That would have a high voltage.
And another:my project was to construct a insulator surface resistivity meter using 4 point probe methord,
the load ranges around 5mega ohms
the load would be in mega ohms range
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