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    Helper Instruments Co. Sinadder 3 Model: S-103v (good working condition)

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    8 months ago by teletechservices

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    S$150

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    2 Likes

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    The Sinadder 3 contains 3 basic instrument functions in one product Sinadder: A specialized distortion meter for making SINAD measurements on radio recievers. Special circuit design speeds and simplifies SINAD measurements by eliminating all distortion meter adjustments. The null circuits of the Sinadder are Internally set to the 1000 Hz tone used for SINAD measurements, and an automatic gain control eliminates the need for setting input gain to the meter. The automatic gain control circuit eliminates the need for setting input gain to the meter, The automatic gain control feature permits the Sinadder to be used as a reciever alignment aid, providing rapid alignment of receivers for optimum performance, 1. AC VOLTMETER: a high impedence audio frequency voltmeter with nine ranges, from 10 millvolts full scale to 100 volts full scale, Input impedence is 1 megaohm and a D.C.blocking condenser is provided 2. LOUDSPEAKER AUDIO MONITOR : An audio amplifier, with loudspeaker and gain control permits audio monitoring of signals connected to the audio voltmeter and of reciver audio when using the Sinadder function. 3. 1,000Hz OSCILLATOR: A low distortion, 1,000 Hz oscillator is included The oscillator may be used as a signal generator modulation source for SINAD measurements, for a transmitter modulation test source, signaling and other uses. Oscillator output Voltage is front panel controlled up to one volt RMS. PANEL CONTROLS: push=push power switch; push/AC VOLTS - push /SINAD switch: rotary AC VOLTS range switch; 1KHz tone output level control; internal speaker level control. INPUT: Permanently affixed shilded test cable w/ miniclips. SINADDER INPUT LEVEL: 210mV to 10vrms SINADDER INPUT IMPEDENCE: 100K Ohm SINADDER ACCURACY: ± 1 dB

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