Abstract: An external calibrating device (10) for a measurement device, which may be an acoustic camera. The calibrating device (10) includes a sound source (11) and a light source (12), which are preferably pointed to the same direction. This direction can be a horizontal direction, where the sources (11, 12) locate on the same vertical side surface of the calibrating device (10). An IR LED can be used as the light source (12). The measurement device may instruct a user how to place and align the measurement device during the calibration process. Guidance is given by instructions, volume range information, and focusing lines on the screen. When the instructions are fulfilled, the user may acknowledge the finished calibration process.

Abstract: An apparatus and method of controlling connection status using a flash with information message. A connection can be established between a communication device and a first party. An operation can trigger an event. A flash with information message can be transmitted on a link signaling channel in response to the event. The flash with information message can include a connection control information record that controls a connection status of the connected first party.

Abstract: Substituted 2-nitro-2'-hydroxy-azobenzenes are manufactured by coupling a phenol dispersed with a dispersing agent in water with a solution, in an inorganic acid, of a diazotized o-nitroaniline at a pH value not exceeding 2.The azobenzenes obtained are intermediate products for benztriazoles.