3C66: Difference between revisions
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The Tektronix 3C66 Carrier Amplifier is designed to amplify signals from transducers | The Tektronix 3C66 Carrier Amplifier is a plug-in introduced in 1963 for 560-series scopes. | ||
such as strain gauges | It is designed to amplify signals from transducers such as strain gauges, whose | ||
mechanical strain. These transducers are usually connected in a bridge circuit. The | impedance varies based on, for example, mechanical strain. | ||
3C66 drives the bridge with a 25kHz "carrier" signal, which is modulated by the relative | These transducers are usually connected in a bridge circuit. | ||
impedances of the arms of the bridge. The resulting signal is amplified and | The 3C66 drives the bridge with a 25kHz "carrier" signal, | ||
envelope-detected by the 3C66, producing a vertical deflection proportional to the | 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 measured quantity (strain, for example). | ||
Revision as of 15:23, 3 July 2010
The Tektronix 3C66 Carrier Amplifier is a plug-in introduced in 1963 for 560-series scopes. It is designed to amplify signals from transducers such as strain gauges, whose impedance 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.
