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JFET conversion a la 1A7
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Vintage dave (talk | contribs) (JFET conversion a la 1A7) |
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* [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)] | * [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)] | ||
* [[Media:070-432.pdf|Tektronix Type W Manual (11MB, PDF)]] | * [[Media:070-432.pdf|Tektronix Type W Manual (11MB, PDF)]] | ||
* [[Media:070-432_Schematic_SN3270up.pdf|Tektronix Type W Schematics Color for SN 3270 up (10MB, PDF)]] | |||
* [[Media:070-1109-00.pdf|Tektronix Type W SN 7000-up Manual (PDF, OCR)]] | |||
* [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)] | * [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)] | ||
* [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969 (PDF, needs OCR)]] | * [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969 (PDF, needs OCR)]] | ||
* [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969 (PDF, needs OCR)]] | * [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969 (PDF, needs OCR)]] | ||
* [[Media:Tek type w cal outline.pdf|Tektronix Type W Calibration Outline (PDF, OCR)]] | |||
<!-- * [[Media:tek_type_w_schem_only.pdf|Tektronix Type W Schematics Only (PDF, OCR)]] --> | <!-- * [[Media:tek_type_w_schem_only.pdf|Tektronix Type W Schematics Only (PDF, OCR)]] --> | ||
}} | }} | ||
The '''Tektronix Type W''' is a differential comparator plug-in amplifier for [[500-series scopes]]. | The '''Tektronix Type W''' is a differential comparator plug-in amplifier for [[500-series scopes]]. | ||
Its bandwidth varies from 23 MHz to 8 MHz depending on gain. | Its bandwidth varies from 23 MHz to 8 MHz depending on gain. Type W is | ||
faster than its [[Z|Type Z]] predecessor, | faster than its [[Z|Type Z]] predecessor, and it extends performance in | ||
terms of sensitivity, reaching 1 mV/div | terms of sensitivity, reaching 1 mV/div. It achieves 20,000 to 1 common-mode | ||
rejection at DC and low frequencies. | rejection at DC and low frequencies. It was designed by [[John Horn]]. | ||
Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "V<sub>C</sub>", | Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "V<sub>C</sub>", | ||
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An output of V<sub>C</sub> is provided on the front panel for precision measurements. | An output of V<sub>C</sub> is provided on the front panel for precision measurements. | ||
Unlike the Type Z, Type W has two gain axes | Unlike the Type Z, Type W has two gain axes: a decade attenuator and a 1−2−5−10−20−50 selector, | ||
reminiscent of [[D|Type D]] from ten years before. | reminiscent of [[D|Type D]] from ten years before. | ||
Type W is the only letter-series plug-in with an "infinite resistance" input mode selectable at the front panel. | Type W is the only letter-series plug-in with an "infinite resistance" input mode selectable at the front panel. | ||
([[1A5 | (Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.) | ||
Early production Type W in a [[556]] mainframe won't | |||
meet spec for overdrive recovery time, because an overdriven W | |||
passes enough common-mode to the mainframe vertical amp to | |||
saturate it. At S/N 3270, this was fixed, by adding another stage to attenuate CM. | |||
The new "output amp" circuit board clips onto the rear bulkhead; | |||
significant hand mods are required on the chassis. | |||
This was also offered as Modification kit 040-0447-00 to retrofit existing instruments. | |||
Type W was created with a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971 (S/N 7000), following the lead of Type [[1A7]], the Nuvistors were replaced by JFETs to reduce drift. Mod kit 040-0590-00 was offered for existing instruments. | |||
In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]], | In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]], | ||
follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]]. | follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]]. | ||
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Type_w_bottom.jpg|Bottom view. | Type_w_bottom.jpg|Bottom view. | ||
Tek w block.png|Block Diagram | Tek w block.png|Block Diagram | ||
Tek w differential comparator.png|Differential Comparator | Tek w differential comparator.png|Differential Comparator, initial version | ||
Tek w input attenuators.png|Input Attenuators | Tek w input attenuators.png|Input Attenuators | ||
Tek w switching diagram.png|Switching Diagram | Tek w switching diagram.png|Switching Diagram | ||
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[[Category:500 series plugins]] | [[Category:500 series plugins]] | ||
[[Category:Differential amplifiers]] | |||