Martin,
The LabVIEW program cannot by itself generate nanoamps, kiloamps, volts or anything else. You need some knid of hardware. If you used a D/A converter with a 10 volt output range and a 10 gigaohm resistor in series you would get 1 nanoamp. However 10 gigaohm resistors are not routinely available or easy to use. Therer are instruments available which can produce low currents and can be controlled via GPIB, which cna in turn be controlled from LV.
If you tell the forum what you are actually trying to do, somone may have an idea about how to approach your problem.
Lynn
