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The Tektronix Type D is a plug-in for [[500-series scopes]].
{{Plugin Sidebar 2 |
title=Tektronix D|
summary=Differential amplifier|
image=Tek type d front.jpg |
caption=D front view|
introduced=1954 |
discontinued=1969 |
series=[[500-series scopes]]|
manuals=
* [http://w140.com/mmm/tek-d.pdf Tektronix Type D Manual (PDF)]
<!-- * [http://w140.com/tek_fcp/tek_type_d_factory_cal_proc.pdf Cal procedure] -->
* [http://bama.edebris.com/manuals/tek/d/ Type D manual @ BAMA]
* [[Media:070-228.pdf|Tektronix Type D Manual (PDF, OCR, bad-OCR)]]
* [[Media:tek_type_d_fcp.pdf|Tektronix Type D Factory Calibration Procedure (PDF, OCR)]]
* [[Media:Tek type d cal outline.pdf|Tektronix Type D Calibration Outline (PDF, OCR)]]
}}


It has high gain, and the bandwidth depends on the gain,
The '''Tektronix Type D''' is a differential amplifier plug-in for [[500-series scopes]].
ranging from 2MHz at 50mV/div and up, to 300kHz at 1mV/div.
It displays the difference between two input signals,
with a common-mode rejection ratio of 10,000.  It has
six tubes, on a shock-mounted subchassis to avoid
microphonics.


Type D was introduced with the [[531]] and [[535]] in 1954 as Type 53D,
Type D was the most sensitive plug-in of the original four.
was briefly renamed Type 53D/54D in 1955 with the introduction
The bandwidth depends on the gain, ranging from 2 MHz at 50 mV/div to 300 kHz at 1 mV/div.
of the [[541]] and [[545], then quickly renamed Type 53/54D,
There are two axes of sensitivity setting: a decade attenuator in front of a gain switch.
then shortened to Type D in 1959 with the introduction of
This scheme would be reprised in Type [[W]].
the 5xxA scopes.  Its last year was 1968.


Some production used a pair of 5814 tubes at the input while others used 12AU7's.
It displays the difference between two input signals, with a common-mode rejection ratio of 10,000.  It has
six tubes, on a shock-mounted subchassis to avoid microphonics.
 
Along with Types [[A]], [[B]], and [[C]], Type D was introduced with the [[531]] and [[535]] in [[introduced in 1954|1954]].
 
At the time it was called Type 53D.
It was briefly renamed 53D/54D in 1955 with the introduction of the [[541]] and [[545]].  This quickly changed to 53/54D, and finally shortened to just "D" in 1959 with the introduction of the 5xxA scopes.
Its final year in the catalog was 1968; it had been superseded by Type [[1A7]] and [[1A6]].
 
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years.
[[B]], [[D]], and [[G]] are next at 15 years.
 
[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-D]].
 
==Internals==
Instruments below serial number 3462 used a pair of [[5814]] tubes at the input; later production used [[12AU7]]'s.
These two tube types have different heater currents, and because the heaters are
These two tube types have different heater currents, and because the heaters are
series-wired, you cannot switch from one type to the other without circuit modification.
series-wired, you cannot switch from one type to the other without circuit modification.


* http://bama.edebris.com/manuals/tek/d/
{{BeginSpecs}}
* http://w140.com/tek_fcp/tek_type_d_factory_cal_proc.pdf
{{Spec | Deflection | 1 mV/Div to 50 V/Div in 1–2–5-10-20-50 sequence and 1-10-100-1000 sequence }}
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
 
{{Spec | Bandwidth | 2 MHz with MV/CM MULTIPLIER set to 50;  300kHz with MV/CM MULTIPLIER set to 1 }}
{{Spec | CMRR | 10000:1 with MILLIVOLTS/CM set to 1, 1000:1 otherwise }}
{{Spec | Signal ranges | }}
{| class="wikitable" border=1 style="margin-left: 8em;" |
!Range
! Common mode dynamic range*
|-
| MILLIVOLTS/CM = 1 || ±2.5 V
|-
| MILLIVOLTS/CM = 10 || ±25 V
|-
| MILLIVOLTS/CM = 100 || ±250 V
|-
| MILLIVOLTS/CM = 1000 || ±500 V
|-
|}
* In practice, Type D behaves well up to about +/-15V if the CM signal is either a brief excursion or a constant.  If the CM varies slowly, DC shift in the input tubes will degrade CMRR.
{{EndSpecs}}
 
==Pictures==
 
<gallery>
 
D.jpeg
D 1.JPG|Front
D 1.JPG.JPG| Chassis
D 3.JPG| Rubber support for elimination of microphonics
D 4.JPG| Chassis bottom
Tek d early schem.png|Early Schematic
Tek d late schem.png|Late Schematic
Tek d late attenuators.png|Late Attenuators
Tek type d front.jpg|Front View (vertical position knob not original)
</gallery>
 
[[Category:500 series plugins]]
[[Category:Differential amplifiers]]

Revision as of 11:22, 30 June 2021

Template:Plugin Sidebar 2

The Tektronix Type D is a differential amplifier plug-in for 500-series scopes.

Type D was the most sensitive plug-in of the original four. The bandwidth depends on the gain, ranging from 2 MHz at 50 mV/div to 300 kHz at 1 mV/div. There are two axes of sensitivity setting: a decade attenuator in front of a gain switch. This scheme would be reprised in Type W.

It displays the difference between two input signals, with a common-mode rejection ratio of 10,000. It has six tubes, on a shock-mounted subchassis to avoid microphonics.

Along with Types A, B, and C, Type D was introduced with the 531 and 535 in 1954.

At the time it was called Type 53D. It was briefly renamed 53D/54D in 1955 with the introduction of the 541 and 545. This quickly changed to 53/54D, and finally shortened to just "D" in 1959 with the introduction of the 5xxA scopes. Its final year in the catalog was 1968; it had been superseded by Type 1A7 and 1A6.

K, L, and T are tied for longest production life, at 16 years. B, D, and G are next at 15 years.

Lavoie Laboratories produced an unauthorized clone, the Lavoie LA-265-D.

Internals

Instruments below serial number 3462 used a pair of 5814 tubes at the input; later production used 12AU7's. These two tube types have different heater currents, and because the heaters are series-wired, you cannot switch from one type to the other without circuit modification.

Key Specifications

Deflection 1 mV/Div to 50 V/Div in 1–2–5-10-20-50 sequence and 1-10-100-1000 sequence
Input impedance 1 MΩ // 47 pF (either input)
Bandwidth 2 MHz with MV/CM MULTIPLIER set to 50; 300kHz with MV/CM MULTIPLIER set to 1
CMRR 10000:1 with MILLIVOLTS/CM set to 1, 1000:1 otherwise
Signal ranges
Range Common mode dynamic range*
MILLIVOLTS/CM = 1 ±2.5 V
MILLIVOLTS/CM = 10 ±25 V
MILLIVOLTS/CM = 100 ±250 V
MILLIVOLTS/CM = 1000 ±500 V
  • In practice, Type D behaves well up to about +/-15V if the CM signal is either a brief excursion or a constant. If the CM varies slowly, DC shift in the input tubes will degrade CMRR.

Pictures