Unformatted text preview: -Yes, since the absorbance is constant (633 nm), Beer’s law is followed. 2b. 1. The purpose of Operational Amplifier A1 is to integrate the input signal in terms of time while the operational amplifier A2 amplifies the voltage. 2. 1mA of current is needed so as not to exceed the output of 10V 3. Low pass filter – is used to absorb the noise Voltage follower – prevents loading errors Current converter – maintains linearity in the photomultiplier Capacitor – it acts as a low pass filter and reduces the voltage Resistor – converts current in to voltage 4. The capacitor and resistors impede the amount of voltage that passes through the operational amplifier which affects the a.c response. 2c) 12 Bit: 10V/4096 = 0.0024 14 Bit: 10V/16384= 6.1 x 10-4 16 bit: 10V/65536 = 1.5 x 10-4 The 12 bit is better since it has a high resolution and it gives out a more precise number....
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- Spring '09
- Operational Amplifier, Ratio, Band-pass filter, Low-pass filter, 12 bit