DE377056C - Device for testing telephones, buzzers, signal horns, etc. like - Google Patents

Description

Patent-A ν Proverbs:

1. A device for testing telephones, buzzers, horns and the like., Characterized in that the device to be tested, connected to an AC circuit of a certain size Ci ) acts acoustically on a microphone (2) , through its resistance change - one in his Circuit-switched optical display device, such as ammeter, voltmeter or the like. Is operated.

2. Device according to claim 1, characterized in that the to be tested Remote receiver as well as the optical display device by means of transmitters to their associated Circuits are switched.

1 sheet of drawings.

Claims (1)

The previously known methods for testing telephones, buzzers, signal horns and the like are largely dependent on the auditor's hearing and enable them to do so thus only a test within certain limits. It also requires eavesdropping a longer time for each apparatus to be tested. The present invention ίο these inconveniences are eliminated in that the to testing remote handset i, in a known manner in an alternating current circuit with a frequency generator 3 and a switch 4 is located directly on a microphone 2 acts, in whose circuit fed by a current source 6 an ammeter 7 is connected via a switch 5, whose pointer deflection indicates the level for the volume of the telephone. Instead of this with the microphone in series The lying ammeter can expediently also have a voltmeter parallel to the microphone 8, as indicated by dashed lines in the drawing, are switched. This circuit has the advantage over the former that the pointer has a larger deflection and consequently a greater fineness in the examination of the loudness is achieved. On the other hand, to achieve a volume for better testing, the Remote receivers can also be coupled to the AC circuit through a transmitter coil. The measuring instruments can also be coupled to the microphone circuit in the same way will. This type of circuit has the advantage over the above-mentioned that the measuring instrument is only activated when the bigger evoked exit telephone to be tested comes into effect, the pointer deflects from the zero position, while with the direct switching of the measuring instruments shown in the drawing, the pointer already assumes a position corresponding to the current strength of the microphone circuit or the voltage of the microphone, from which position when the Remote control by the volume of the same
blow occurs. The invention is not limited to \ * Before Using ^v on measuring instruments restricted but may for example also a resting on a membrane of a connected into the microphone circuit speaker liquid column to be used as a display means having the same effect, the amount of change in a degree of the volume of the test circuit connected remote receiver forms.