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Operation of a Complete Arrangement for the Testing of the Earphone.
Fig. 2.1 shows a typical measuring arrangement used to check the frequency
characteristic of earphones.
~6375~
Fig.
2.1.
Typical measuring arrangement for tile production cl1eck of earphone
characteristics.
It
consists of a Beat Frequency Oscillator Type 1022 built together with a
High Speed Level Recorder Type 2305 and a Microphone Amplifier Type
2603. The adjustment of the different instruments are made as follows:
Adjustment of the Oscillator.
1. Turn the toggle switch marked PO,VER to "On" and adjust the frequency
scale as described in the Instruction Manual for the Type 1022 under
"Operation".
2. Set the frequency scale pointer to 1ooo Hz.
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