Unlike the 34901A module, the 16-channel 34902A module does not include a dedicated current measuring channel.

Instead, add a user-supplied shunt resistor to the circuit and use a scaling equation to convert the voltage drop across the shunt to mA or the engineering units of choice. This same technique can be used to measure current on the non-dedicated current channels of the 34901A.

The shunt resistor should be a low-value, high-precision resistor, placed in series with the circuit-under-test. Power dissipation and drift characteristics in the shunt should be considered. Accurately measure the resistance of the shunt so that a precise scaling factor can be calculated using Ohm's Law.

The link below is a video demonstrating this technique of using a shunt resistor to measure current on a voltage channel.

With a user provided shunt, you measure ACV or DCV and divide by the known resistance to get the current. OR, you can use the built in scaling function to do this division.

Instead, add a user-supplied shunt resistor to the circuit and use a scaling equation to convert the voltage drop across the shunt to mA or the engineering units of choice. This same technique can be used to measure current on the non-dedicated current channels of the 34901A.

The shunt resistor should be a low-value, high-precision resistor, placed in series with the circuit-under-test. Power dissipation and drift characteristics in the shunt should be considered. Accurately measure the resistance of the shunt so that a precise scaling factor can be calculated using Ohm's Law.

The link below is a video demonstrating this technique of using a shunt resistor to measure current on a voltage channel.

http://www.youtube.com/watch?v=Xfwl0MWbdJc