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The Type W is a plug-in amplifier for 500-series scopes. | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
|series=500-series scopes | |||
|type=Type W | |||
|summary=8-23 MHz differential comparator | |||
|image=Tek_Type_W_Front–Tight.jpg | |||
|caption=Type W front view | |||
|introduced=1965 | |||
|discontinued=1974 | |||
|designers=John Horn | |||
|manuals= | |||
* [[Media:070-432.pdf|Tektronix Type W Manual]] (11MB) | |||
* [[Media:070-432_Schematic_SN3270up.pdf|Tektronix Type W Schematics Color for SN 3270 up]] (10MB) | |||
* [[Media:070-1109-00.pdf|Tektronix Type W SN 7000-up Manual]] (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]], designed by [[John Horn]]. | |||
{{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>", | |||
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. | |||
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, 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]]. | |||
Type W uses three type [[8416]] tubes, the 12V version of the [[6DJ8]]. | |||
==Pictures== | |||
<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_topleft.jpg|Top-left view. | |||
Type_w_bottom.jpg|Bottom view. | |||
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> | |||
==Components== | |||
{{Parts|W}} | |||
[[Category:500 series plugins]] | |||
[[Category:Differential amplifiers]] | |||