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11A52: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Dual channel 600 MHz amplifier | | |series=11000-series scopes | ||
image=Tek 11a52 front.jpg | | |type=11A52 | ||
caption=Tek 11A52 | |summary=Dual channel 600 MHz amplifier | ||
|image=Tek 11a52 front.jpg | |||
introduced=1987 | | |caption=Tek 11A52 | ||
discontinued=(?) | | |introduced=1987 | ||
manuals= | |discontinued=(?) | ||
|designers= | |||
|manuals= | |||
* [http://w140.com/tek_11a52_user.pdf Tektronix 11A52 User Manual (PDF)] | * [http://w140.com/tek_11a52_user.pdf Tektronix 11A52 User Manual (PDF)] | ||
* [[Media:070-7391-99.pdf|Tektronix 11A52 Extended Service Manual (PDF)]] | * [[Media:070-7391-99.pdf|Tektronix 11A52 Extended Service Manual (PDF)]] | ||
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It uses custom Tek chips including the [[155-0076-00]] (M94 overload detector) and [[M377]] amplifier chip. | It uses custom Tek chips including the [[155-0076-00]] (M94 overload detector) and [[M377]] amplifier chip. | ||
In the 11A52, the digital output of the M94 overload detectors (one per channel) | In the 11A52, the digital output of the M94 overload detectors (one per channel) are received by the microprocessor. | ||
are received by the microprocessor. | If overload is detected, software running in the microprocessor switches the input relay to remove the signal from the 50 Ω attenuator. | ||
If overload is detected, software running in the microprocessor switches the input relay | |||
to remove the signal from the 50 Ω attenuator. | |||
This is in contrast to the [[485]], where the M94 directly controls the input relay. | This is in contrast to the [[485]], where the M94 directly controls the input relay. | ||
During the 11A52's self-check, the M94 IC for each channel is tested. | During the 11A52's self-check, the M94 IC for each channel is tested. | ||
An analog switch injects test currents, positive and negative, | An analog switch injects test currents, positive and negative, into the summing junction at the input of each M94. | ||
into the summing junction at the input of each M94. | |||
The outputs are checked by the self-check software routine. | The outputs are checked by the self-check software routine. | ||