3C66: Difference between revisions
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{{Plugin Sidebar | | {{Plugin Sidebar | ||
manufacturer=Tektronix |series=560-series scopes |type= 3C66 | | | manufacturer=Tektronix | ||
summary= | | series=560-series scopes | ||
image=3c66_front.jpg | | | type= 3C66 | ||
caption=Tektronix 3C66 | | | summary=Carrier Amplifier Plug-In | ||
designers= | | image=3c66_front.jpg | ||
introduced=1963 | | | caption=Tektronix 3C66 | ||
discontinued=1974 | | | designers= | ||
manuals= | | introduced=1963 | ||
| discontinued=1974 | |||
| manuals= | |||
* [[Media:070-357.pdf|Tektronix 3C66 Manual]] (PDF) | * [[Media:070-357.pdf|Tektronix 3C66 Manual]] (PDF) | ||
}} | }} | ||
Revision as of 09:49, 19 November 2023
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 25 kHz "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 measured quantity (strain, for example).
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 5 kHz. 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.
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schematic
