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The Type W is a differential comparator plug-in amplifier for [[500-series scopes]]. Its bandwidth varies from | {{Plugin Sidebar 2 | | ||
depending on gain. | title=Tektronix Type W | | ||
summary=8-23 MHz differential comparator | | |||
image=type w front.jpg | | |||
caption=Type W front view| | |||
The " | introduced=1965 | | ||
discontinued=1974 | | |||
series=[[500-series scopes]]| | |||
manuals= | |||
* [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)] | |||
* [[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]]. | |||
Its bandwidth varies from 23 MHz to 8 MHz depending on gain. Type W is | |||
faster 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. 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>", | |||
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, | |||
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 | An output of V<sub>C</sub> is provided on the front panel for precision measurements. | ||
Type W has two gain axes | |||
Type W is the only letter-series | 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. | ||
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]] [[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]]. | |||
==Specifications== | |||
[[Category:Specifications needed]] ''please add'' | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Type_w_front.jpg|Front view. | |||
Type_w_topleft.jpg|Top-left view. | |||
Type_w_bottom.jpg|Bottom view. | |||
Tek w block.png|Block Diagram | |||
Tek w differential comparator.png|Differential Comparator, initial version | |||
Tek w input attenuators.png|Input Attenuators | |||
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: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
-
Front view.
-
Top-left view.
-
Bottom view.
-
Block Diagram
-
Differential Comparator, initial version
-
Input Attenuators
-
Switching Diagram
-
A-phase (prototype) Type W
-
A-phase (prototype) Type W
-
A-phase (prototype) Type W
-
A-phase (prototype) Type W
-
A-phase (prototype) Type W