Dear all,
In the previous post I gave an introduction about Telemetry. Now I am giving more details for your convenance. I hope this series of article will help you in increasing your general knowledge.
In general, the resulting values need to be brought into a suitable form so that they can be tracked.
Special attention requires the transmission of DC signals, as obtained eg resistive or capacitive sensors (eg voltage change to a constant current flows, temperature-dependent resistance). Suitable measures pulse train is such a measuring voltage to an AC voltage or a put, so that supply voltage variations and temperature drifts. Transmission modules do not simulate the change of measured value. suitable for this purpose such as a pulse train whose pulse rate or pulse duration of resistance or capacitance of the sensor is different.
The transmission frequency of the telemetry transmitter may be modulated by such a pulse sequence or with a sensor directly from the supplied AC signal.
In the receiver this signal is recovered by suitable demodulation and derived from the corresponding measurement value. An applied method for analog measurement
signals, for example, a pulse shaper with low pass filter.
Today, virtually only digital Telemetries are common. The recorded measurement is implemented locally using an analog-digital converter (ADC A / D converter) into a binary string that can then be tracked with suitably modulated carrier and the receiving end reconstructed without information loss.
Please stand by for the next part of the article.
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