A test circuit is disclosed for testing embedded synchronous memories. The rapid change nozzle slides into a window in the side of the sprinkler head and latches into place. Data from the preliminary image is used to identify features of interest in the object or to perform other image analyses that do not require a high-resolution image. Upon determination that the received unicast frame is the converted unicast frame, the communication apparatus reconverts the received unicast frame to a multicast frame and transfers the reconverted multicast frame to an application installed in the communication apparatus to utilize a multicast frame. The tool may include a spindle lock assembly. In this case, it is designed so that current flowing through the respective circuits is about 2\u02dc3 \u03bcA.