There are many real-world situation where you may want to measure a 50/60Hz AC current. Typical uses might be motor current monitoring and general fault sensing.
The new SPice10204 provides such AC current measurement easily and economically. It is a SPice board for MMi99 and SL99 controllers. It consists of a small printed circuit board with a miniature current transformer, a precision rectifier and a DC amplifier. The full scale range is 5A rms. The circuit is average responding but scaled for rms current with a sinusoidal waveform (which is to say it responds just like a typical non-rms responding multimeter).
As a "bonus" the board has 2 potentiometers that can be used for any arbitrary purpose, such as SPLatWare based calibration or analog settings.
More details on our website.