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3C66: Difference between revisions
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The Tektronix 3C66 Carrier Amplifier is designed to amplify signals from transducers | |||
such as strain gauges. The impedance of the transducers varies based on, for example, | |||
mechanical strain. These transducers are usually connected in a bridge circuit. The | |||
3C66 drives the bridge with a 25kHz "carrier" signal, which is modulated by the relative | |||
impedances of the arms of the bridge. The resulting signal is amplified and | |||
envelope-detected by the 3C66, producing a vertical deflection proportional to the | |||
the measured quantity (strain, for example). | |||
The 3C66 provides built-in variable impedances for balancing the bridge. Because the | |||
carrier is 25kHz, the maximum bandwith of the measured quantity is 5kHz. This limitation | |||
is due to the settling time of the envelope detector. In addition to the vertical | |||
defection signal, the 3C66 provides a front panel output of the measured signal. | |||
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Image:3c66_front.jpg | Image:3c66_front.jpg | ||