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series=[[500-series scopes]]|
series=[[500-series scopes]]|
manuals=
manuals=
* [http://bama.edebris.com/manuals/tek/w/ Tektronix Type W Manual (BAMA)]
* [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_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 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)]] -->
}}
}}
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.  Only modestly
Its bandwidth varies from 23 MHz to 8 MHz depending on gain.  Type W is
faster than its predecessor, the Type [[Z]], the Type W extends performance in  
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.  It was designed by [[John Horn]].


It achieves 20,000 to 1 common-mode rejection at DC and low frequencies.
Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "V<sub>C</sub>",  
It has 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.
A mode switch selects between displaying A−V<sub>C</sub>, A−B, or V<sub>C</sub>−B.   
 
The "A−B" mode is particularly useful for displaying the current in a sense resistor,  
Type W has two signal inputs, "A" and "B". 
A mode switch selects between displaying A-Vc, A-B, or Vc-B.   
The "A-B" mode is particularly useful for displaying the current in a sense resistor,  
while the other modes provide "slideback" measurements of small variations superimposed on a large constant.   
while the other modes provide "slideback" measurements of small variations superimposed on a large constant.   
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 of the Type W.  Unlike the [[Z|Type Z]],
Unlike the Type Z, Type W has two gain axes: a decade attenuator and a 1−2−5−10−20−50 selector,  
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.
(Type [[1A5]] has 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
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.
   
   
In the letter-series timeline of differential comparators, the Type W, [[introduced in 1965]],  
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.
follows the Type [[Z]] and precedes [[1A5|Type 1A5]].
 
In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]],  
follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]].


==Specifications==
==Specifications==
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==Pictures==
==Pictures==
<gallery>
<gallery>
Image:Type_w_front.jpg|Front view.
Type_w_front.jpg|Front view.
Image:Type_w_topleft.jpg|Top-left view.  
Type_w_topleft.jpg|Top-left view.  
Image:Type_w_bottom.jpg|Bottom view.
Type_w_bottom.jpg|Bottom view.
File:Tek w block.png|Block Diagram
Tek w block.png|Block Diagram
File:Tek w differential comparator.png|Differential Comparator
Tek w differential comparator.png|Differential Comparator, initial version
File:Tek w input attenuators.png|Input Attenuators
Tek w input attenuators.png|Input Attenuators
File:Tek w switching diagram.png|Switching Diagram
Tek w switching diagram.png|Switching Diagram
Tek type w a phase 1.jpg|A-phase (prototype) Type W
Tek type w a phase 2.jpg|A-phase (prototype) Type W
Tek type w a phase 3.jpg|A-phase (prototype) Type W
Tek type w a phase 4.jpg|A-phase (prototype) Type W
Tek type w a phase 5.jpg|A-phase (prototype) Type W
</gallery>
</gallery>


[[Category:500 series plugins]]
[[Category:500 series plugins]]
[[Category:Differential amplifiers]]

Revision as of 10:37, 18 June 2021

Template:Plugin Sidebar 2 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. Type W is faster than its 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. It was designed by John Horn.

Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "VC", 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. A mode switch selects between displaying A−VC, A−B, or VC−B. The "A−B" mode is particularly useful for displaying the current in a sense resistor, while the other modes provide "slideback" measurements of small variations superimposed on a large constant. An output of VC 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, reminiscent of 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. (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 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 Type Z and precedes Type 1A5.

Specifications

please add

Pictures