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{{Plugin Sidebar 2 |
{{Plugin Sidebar  
title=Tektronix Type W |
|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=Tek_Type_W_Front–Tight.jpg  
discontinued=1974 |
|caption=Type W front view
series=[[500-series scopes]]|
|introduced=1965
manuals=
|discontinued=1974
* [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)]
|designers=John Horn
* [[Media:070-432.pdf|Tektronix Type W Manual (11MB, PDF)]]
|manuals=
* [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)]
* [[Media:070-432.pdf|Tektronix Type W Manual]] (11MB)
* [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969 (PDF, needs OCR)]]
* [[Media:070-432_Schematic_SN3270up.pdf|Tektronix Type W Schematics Color for SN 3270 up]] (10MB)
* [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969 (PDF, needs OCR)]]
* [[Media:070-1109-00.pdf|Tektronix Type W SN 7000-up Manual]] (OCR)
<!-- * [[Media:tek_type_w_schem_only.pdf|Tektronix Type W Schematics Only (PDF, OCR)]] -->
* [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969]] (OCR)
* [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969]] (OCR)
* [[Media:Tek type w cal outline.pdf|Tektronix Type W Calibration Outline]] (OCR)
<!--
* [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)]
* [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)]
* [[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]].
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.


{{BeginSpecs}}
{{Spec | Deflection        | 1 mV/Div to 50 V/Div, 1–2–5 (6-position) and 4-position decade attenuator }}
{{Spec | Input impedance  | 1 MΩ // 20 pF (either input) }}
{{Spec | Bandwidth        | 26 MHz (23 MHz below S/N 7000) @ 50 mV/cm;  8 MHz @ 1 mV/cm }}
{{Spec | Common Mode Range | ±15 V after INPUT ATTEN }}
{{Spec | CMRR              | DC Coupled: 20000:1 DC to 20 kHz, 500:1 at 500 kHz; AC Coupled: 1000:1 at 60 Hz }}
{{Spec | Signal ranges    | }}
{| class="wikitable" border=1 style="margin-left: 8em;" |
!Maximum Input Voltage (S/N 7000-up)
|-
| DC Coupled || 350 V
|-
| AC Coupled || 500 V
|-
!Maximum Input Voltage (S/N 101-6999)
|-
| INPUT ATTEN = 1 || 15 V
|-
| INPUT ATTEN = 10 || 150 V
|-
| INPUT ATTEN = 100 || ±350 V (DC Coupled); 500 V (AC Coupled)
|-
| INPUT ATTEN = 1000 || ±350 V (DC Coupled); 500 V (AC Coupled)
|-
|}
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.
{{EndSpecs}}
==Links==
{{Documents|Link=W}}
==Calibration Fixture==
:[[067-0503-00]] Precision DC Divider, 10x & 100x
==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.  
Line 28: Line 69:
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.
([[1A5|Type 1A5]] has an internal jumper that can be cut.)
(Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.)


Original production uses a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end; starting at serial number 7000 these were replaced with JFETs.
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, 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.
follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]].
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==
Type W uses three type [[8416]] tubes, the 12V version of the [[6DJ8]].
[[Category:Specifications needed]] ''please add''


==Pictures==
==Pictures==
<gallery>
<gallery>
Tek_Type_W_Front.jpg|Front View
Tek_Type_W_Right.jpg|Right View
Tek_Type_W_Left.jpg|Left View
Tek_Type_W_Top.jpg|Top View
Tek_Type_W_Bottom.jpg|Bottom View
Tek w block.png|Block Diagram
Type_w_front.jpg|Front view.
Type_w_front.jpg|Front view.
Type_w_topleft.jpg|Top-left view.  
Type_w_topleft.jpg|Top-left view.  
Type_w_bottom.jpg|Bottom view.
Type_w_bottom.jpg|Bottom view.
Tek w block.png|Block Diagram
Tek w differential comparator.png|Differential Comparator, initial version
Tek w differential comparator.png|Differential Comparator
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
Line 57: Line 106:
Tek type w a phase 5.jpg|A-phase (prototype) Type W
Tek type w a phase 5.jpg|A-phase (prototype) Type W
</gallery>
</gallery>
==Components==
{{Parts|W}}


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

Latest revision as of 17:37, 9 March 2024

Tektronix Type W
8-23 MHz differential comparator
Type W front view

Compatible with 500-series scopes

Produced from 1965 to 1974

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type W is a differential comparator plug-in amplifier for 500-series scopes, designed by John Horn.

Key Specifications

Deflection 1 mV/Div to 50 V/Div, 1–2–5 (6-position) and 4-position decade attenuator
Input impedance 1 MΩ // 20 pF (either input)
Bandwidth 26 MHz (23 MHz below S/N 7000) @ 50 mV/cm; 8 MHz @ 1 mV/cm
Common Mode Range ±15 V after INPUT ATTEN
CMRR DC Coupled: 20000:1 DC to 20 kHz, 500:1 at 500 kHz; AC Coupled: 1000:1 at 60 Hz
Signal ranges
Maximum Input Voltage (S/N 7000-up)
DC Coupled 350 V
AC Coupled 500 V
Maximum Input Voltage (S/N 101-6999)
INPUT ATTEN = 1 15 V
INPUT ATTEN = 10 150 V
INPUT ATTEN = 100 ±350 V (DC Coupled); 500 V (AC Coupled)
INPUT ATTEN = 1000 ±350 V (DC Coupled); 500 V (AC Coupled)

Type W is faster (bandwidth 23 MHz to 8 MHz depending on gain) 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.

Links

Documents Referencing W

Document Class Title Authors Year Links
Tekscope 1970 V2 N5 Oct 1970.pdf Article Amplitude Measurement to Better Than 1% 1970 1S1 • 7503 • 7A13 • 1A5 • W • 3A7
Tekscope 1972 V4 N5 Sep 1972.pdf Article A Practical Approach to Differential Amplifiers and Measurements Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z
Tekscope 1972 V4 N6 Nov 1972.pdf Article Differential Amplifiers and Measurements, Part 2 Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z

Calibration Fixture

067-0503-00 Precision DC Divider, 10x & 100x

Operation

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.

Type W uses three type 8416 tubes, the 12V version of the 6DJ8.

Pictures

  • Front View

    Front View

  • Right View

    Right View

  • Left View

    Left View

  • Top View

    Top View

  • Bottom View

    Bottom View

  • Block Diagram

    Block Diagram

  • Front view.

    Front view.

  • Top-left view.

    Top-left view.

  • Bottom view.

    Bottom view.

  • Differential Comparator, initial version

    Differential Comparator, initial version

  • Input Attenuators

    Input Attenuators

  • Switching Diagram

    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

    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

Components

Some Parts Used in the W

Part Part Number(s) Class Description Used in
6DJ8 154-0187-00 • 154-0305-00 Vacuum Tube (Dual Triode) dual triode 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4
8056 154-0417-00 Vacuum Tube (Triode) low-voltage Nuvistor triode 422 • 502 • W • 1S1 • 3A7 • 3S3 • 3T4 • 5T3 • 10A1
8416 154-0413-00 • 157-0116-00 Vacuum Tube (Dual Triode) dual triode 1S1 • 2A61 • 3A8 • 3L5 • W
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