Open circuit means is not connected with any other circuit. Imposition happens when we connect to it with a load or integrated circuits are added to the output earlier (see Figure 2.23 (b)) and the output voltage before being dropped off several volts if debandingkan with an open circuit before, where V y2 <V y1. Different loading will result in a reduction (drop) voltage is different. V y1 value if measured with a voltmeter will indicate by V y 1 = V x.
If the electrical quantities such as signal frequency or digital signals, the loading is not a problem. In this case, the signal after loading will happen in terms of the amount of frequency error. Imposition is very important when the amount used is amplitude. There are two types of signal conditioning circuit, which is a series of passive and active circuits. There are several examples of passive circuit, the divider circuit (divider circuits), the bridge circuit (bridge circuits), RC filter (RC filter) and others.
Bridge circuit and divider are two passive circuit techniques that have been used for signal conditioning immemorial. Although modern active circuit menggantika this technique, there are still many applications that use this technique to his advantage. Bridge circuit is specifically used to obtain high accuracy in the measurement of impedance. There are series that have very small impedance changes, then this is where the bridge circuit is required.
Another type of passive circuit included in the signal conditioning is to filter out unwanted frequencies from the measured signal. In practice in the field of electronics industry or another, found the signal with less noise (unwanted signals) that have a low frequency or high frequency, whereas signals such as these are not expected to appear. An example is to convert the temperature sensor generates a dc voltage signal, proportional to temperature.
Due to a power source that is used in the surrounding environment using 60 Hz ac signal (voltage electricity grid), there is the possibility of a 60 Hz signal affects the output voltage of the sensor which is certainly no difference to the temperature that should be proportional earlier. Passive circuit consisting of resistors and capacitors are often used to eliminate noise that has a high and low frequencies without changing the signal should be.