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3C66: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | | ||
manufacturer=Tektronix |series=560-series scopes |type= 3C66 | | |||
summary=Carrier Amplifier plugin | | summary=Carrier Amplifier plugin | | ||
image=3c66_front.jpg | | image=3c66_front.jpg | | ||
caption=Tektronix 3C66 | | caption=Tektronix 3C66 | | ||
designers= | | |||
introduced=1963 | | introduced=1963 | | ||
discontinued=1974 | | discontinued=1974 | | ||
| Line 10: | Line 10: | ||
* [http://bama.edebris.com/download/tek/3c66/tek%203c66.v6.pdf Tektronix 3C66 Manual (PDF)] | * [http://bama.edebris.com/download/tek/3c66/tek%203c66.v6.pdf Tektronix 3C66 Manual (PDF)] | ||
}} | }} | ||
The '''Tektronix 3C66 Carrier Amplifier''' is a plug-in [[introduced in 1963]] for | The '''Tektronix 3C66 Carrier Amplifier''' is a plug-in [[introduced in 1963]] for [[560-series scopes]]. | ||
[[560-series scopes]]. | |||
It is designed to amplify signals from transducers such as strain gauges, | It is designed to amplify signals from transducers such as strain gauges, whose impedance varies based on, for example, mechanical strain. | ||
whose impedance varies based on, for example, mechanical strain. | |||
These transducers are usually connected in a bridge circuit. | These transducers are usually connected in a bridge circuit. | ||
The 3C66 drives the bridge with a 25 kHz "carrier" signal, | The 3C66 drives the bridge with a 25 kHz "carrier" signal, which is modulated by the relative impedances of the arms of the bridge. | ||
which is modulated by the relative | The resulting signal is amplified and envelope-detected by the 3C66, producing a vertical deflection proportional to the measured quantity (strain, for example). | ||
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 measured quantity (strain, for example). | |||
The 3C66 provides built-in variable impedances for balancing the bridge. | The 3C66 provides built-in variable impedances for balancing the bridge. | ||
Because the carrier is 25 kHz, the maximum bandwidth of the measured quantity is | Because the carrier is 25 kHz, the maximum bandwidth of the measured quantity is 5 kHz. | ||
This limitation is due to the settling time of the envelope detector. | This limitation is due to the settling time of the envelope detector. | ||
In addition to the vertical deflection signal, the 3C66 provides a front panel output of the measured signal. | In addition to the vertical deflection signal, the 3C66 provides a front panel output of the measured signal. | ||