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{{Plugin Sidebar | | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=8-23 MHz differential comparator | | |series=500-series scopes | ||
image=type w front.jpg | | |type=Type W | ||
caption=Type W front view| | |summary=8-23 MHz differential comparator | ||
introduced=1965 | | |image=type w front.jpg | ||
discontinued=1974 | | |caption=Type W front view | ||
|introduced=1965 | |||
manuals= | |discontinued=1974 | ||
|designers=John Horn | |||
|manuals= | |||
* [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)]] | ||
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<!-- * [[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]], designed by [[John Horn]]. | ||
{{MissingSpecs}} | |||
Type W is faster (bandwidth 23 MHz to 8 MHz depending on gain) than its [[Z|Type Z]] predecessor, and it extends performance in terms of sensitivity, reaching 1 mV/div. | |||
It achieves 20,000 to 1 common-mode rejection at DC and low frequencies. | |||
==Operation== | |||
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>", | ||
which is controlled by a ten-turn pot and can vary from either −1.1 V to +1.1 V or −11 V to +11 V. | which is controlled by a ten-turn pot and can vary from either −1.1 V to +1.1 V or −11 V to +11 V. | ||
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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: a decade attenuator and a 1−2−5−10−20−50 selector, | 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. | ||
(Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.) | (Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.) | ||
Early production Type W in a [[556]] mainframe won't | 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. | ||
meet spec for overdrive recovery time, because an overdriven W | 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. | ||
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. | 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. | 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]], follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]]. | |||
[[ | |||
==Pictures== | ==Pictures== |