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The required bandwidth of the preamplifier used in cell counter must be?(a) 70 kHz(b) 120 kHz(c) 70 Hz(d) 120 HzI had been asked this question in an online quiz.My enquiry is from Transmission of Video Images topic in section Telemedicine Technology of Biomedical Instrumentation

Answer»

Correct CHOICE is (a) 70 kHz

The explanation is: The electronic circuit MUST have UPPER frequency response GREATER than 70 kHz. The preamplifier used in cell counters must be of very low noise preferably having noise voltage less than 2 nA at the required BANDWIDTH of 70 kHz.



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