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Definition
anything that affect the chemistry ofthe system being analyzed.
Ex: Temperature, Pressure, chemical equilibrium, humidity |
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Definition
associated with instrument components.
Ex: input transucer, signal processing elements,output transducer |
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Term
| Thermal Noise/ Johnson Noise |
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Definition
| cause by thermal agitation of electrons or other charge carriers in reistors, capacitors, radiation transducers, electrochemical cells, and other resistive elements. This leads to voltage fluctuation. dissappears only at absolute zero. Thermal noise can be decreased by narrowing the bandwidth, and decreasing temperature |
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Term
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Definition
| encountered when electrons or other charged particles cros a junction. |
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Term
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Definition
| noise magnitude is inversely proportional to the frequency of the signal being obsrved. causes are not understood but becomes significant at lower frequencies (100hz) |
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Definition
| noise arising from the surroundings . instrument can pick up stray electromagnetic radiation and convert it to an electrical signal. |
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Term
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Definition
| signals are converted to frequency ranges with low environmental noise to reduce noise. |
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