1A5: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
 
(25 intermediate revisions by 5 users not shown)
Line 1: Line 1:
{{Plugin Sidebar 2 |
{{Plugin Sidebar  
title=Tektronix 1A5 |
|manufacturer=Tektronix
summary=50 MHz Differential Amplifier |
|type=1A5  
image=1a5 front.jpg |
|summary=50 MHz Differential Amplifier  
caption=Tektronix 1A5 Differential Amplifier |
|image=Tek 1a5 front2.jpeg
series=[[500-series scopes]] |
|caption=Tektronix 1A5 Differential Amplifier  
introduced=1967 |
|series=500-series scopes
discontinued=1975 |
|introduced=1967  
manuals=
|discontinued=1975  
* [http://w140.com/mmm/tek-1a5.pdf Tektronix 1A5 Manual (PDF)]
|designers=Bill DeVey
|manuals=
* [[Media:070-0638-00.pdf|Tektronix 1A5 Manual]] (OCR)
* [[Media:Tek Type 1A5 FCP 1969.pdf|Tektronix Type 1A5 Factory Calibration Procedure, March 1969]] (OCR)
* [[Media:Tek 1a5 fcp sep 1967.pdf‎|Tektronix 1A5 Factory Calibration Procedure, September 1967]]
* [[Media:Tek 1a5 cal outline.pdf|Tektronix 1A5 Calibration Outline]] (OCR)
}}
}}
The '''Tektronix Type 1A5''' is a differential amplifier plug-in for [[500-series scopes]].   
The '''Tektronix Type 1A5''' is a differential amplifier plug-in for [[500-series scopes]].   
It was designed by [[Bill DeVey]] after consultation with [[John Kobbe]].


It has an [[Amphenol 165 series connector]] on the front panel for direct connection of the Type [[P6046|P6046 Active Differential Probe]].   
It has an [[Amphenol 165 series connector]] on the front panel for direct connection of the Type [[P6046|P6046 Active Differential Probe]].   
Line 16: Line 22:
Type 1A5 was [[introduced in 1967]], replacing Types [[W]] and [[Z]], and lasted until the end of the 500-series scope line.
Type 1A5 was [[introduced in 1967]], replacing Types [[W]] and [[Z]], and lasted until the end of the 500-series scope line.


==Specifications==
{{BeginSpecs}}
Bandwidth is 50 MHz down to 5 mV/div.
{{Spec | Bandwidth             | 50 MHz down to 5 mV/div, 40 MHz at 1 mV/div }}
The maximum differential sensitivity is 1 mV/div, with a bandwidth of 40 MHz.
{{Spec | Deflection            | 1 mV/div to 20 V/div, 1−2−5 }}
Common-mode rejection is 20,000 to 1 at low frequencies, deteriorating to 200:1 at 20 MHz. 
{{Spec | Common-mode rejection | 20,000:1 from DC to 100 kHz, 10,000:1 up to 1 MHz, 200:1 at 20 MHz }}
{{EndSpecs}}


Like most Tektronix differential plug-ins, it has three modes:  
Like most Tektronix differential plug-ins, the 1A5 has three modes:  
V<sub>A</sub>-V<sub>C</sub>, V<sub>A</sub>-V<sub>B</sub>, and V<sub>C</sub>-V<sub>B</sub>.
V<sub>A</sub>−V<sub>C</sub>, V<sub>A</sub>−V<sub>B</sub>, and V<sub>C</sub>−V<sub>B</sub>.
V<sub>C</sub> is controlled by a ten-turn potentiometer and can vary from -5 V to +5 V (0.5 V on the 5 V/div to 20 V/div ranges). 


[[Category:Specifications needed]]''please add''
V<sub>C</sub> is controlled by a ten-turn potentiometer and can vary from −5 V to +5 V (0.5 V on the 5 V/div to 20 V/div ranges). 
 
==Internals==
The 1A5 is solid-state except for a pair of [[7586|7586 nuvistors]] used in the upper half of a cascode in the second amplifier stage.
 
The attenuator switching is mechanically complex.  A gear mechanism drives the input attenuator switch (under the internal cover) selecting attenuators ×1000 (20 V/div to 5 V/div), ×100 (2 V/div to 500 mV/div), ×10 (200 mv/div to 50 mV/Div) or no attenuators (20 mV/Div to 1 mV/div).
 
Additionally, in the 500 mV/div and 50 mV/div positions, the operator can pull the V/Div knob outward when switching to one of the next two more sensitive ranges, in which case the higher attenuator (and higher input and comparison voltage range) remains in place.


==Pictures==
==Pictures==


<gallery>
<gallery>
1a5 front.jpg
Tek 1a5 front2.jpeg ‎
1a5 right2.jpg
</gallery>
1a5 right.jpg
 
1a5 left.jpg
'''Interior'''
<gallery>
Tek 1A5 left wo cover.jpg | Left side (attenuator cover removed)
1A5 output board.jpg     | Output board (left side) with HF Comp. daughterboard removed to show reed relays
Tek 1A5 right.jpg        | Right side
Tek 1a5 left2.jpeg ‎      | Left side (attenuator cover in place)
Tek 1a5 right2.jpeg ‎      | Right side
Tek 1a5 top2.jpeg        | Top
1a5 right.jpg             | Top
Tek 1a5 bottom2.jpeg ‎    | Bottom
Tek 1a5 rear2.jpeg ‎      | Rear
</gallery>
 
'''Switches detail'''
<gallery>
Tek 1A5 switches 1.jpg
Tek 1A5 switches 2.jpg
Tek 1A5 switches 3.jpg
Tek 1A5 switches 4.jpg
Tek 1A5 switches 5.jpg
</gallery>
</gallery>
==Components==
{{Parts|1A5}}


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

Latest revision as of 04:41, 12 February 2024

Tektronix 1A5
50 MHz Differential Amplifier
Tektronix 1A5 Differential Amplifier

Compatible with 500-series scopes

Produced from 1967 to 1975

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 1A5 is a differential amplifier plug-in for 500-series scopes. It was designed by Bill DeVey after consultation with John Kobbe.

It has an Amphenol 165 series connector on the front panel for direct connection of the Type P6046 Active Differential Probe.

Type 1A5 was introduced in 1967, replacing Types W and Z, and lasted until the end of the 500-series scope line.

Key Specifications

Bandwidth 50 MHz down to 5 mV/div, 40 MHz at 1 mV/div
Deflection 1 mV/div to 20 V/div, 1−2−5
Common-mode rejection 20,000:1 from DC to 100 kHz, 10,000:1 up to 1 MHz, 200:1 at 20 MHz

Like most Tektronix differential plug-ins, the 1A5 has three modes: VA−VC, VA−VB, and VC−VB.

VC is controlled by a ten-turn potentiometer and can vary from −5 V to +5 V (0.5 V on the 5 V/div to 20 V/div ranges).

Internals

The 1A5 is solid-state except for a pair of 7586 nuvistors used in the upper half of a cascode in the second amplifier stage.

The attenuator switching is mechanically complex. A gear mechanism drives the input attenuator switch (under the internal cover) selecting attenuators ×1000 (20 V/div to 5 V/div), ×100 (2 V/div to 500 mV/div), ×10 (200 mv/div to 50 mV/Div) or no attenuators (20 mV/Div to 1 mV/div).

Additionally, in the 500 mV/div and 50 mV/div positions, the operator can pull the V/Div knob outward when switching to one of the next two more sensitive ranges, in which case the higher attenuator (and higher input and comparison voltage range) remains in place.

Pictures

Interior

  • Left side (attenuator cover removed)

    Left side (attenuator cover removed)

  • Output board (left side) with HF Comp. daughterboard removed to show reed relays

    Output board (left side) with HF Comp. daughterboard removed to show reed relays

  • Right side

    Right side

  • Left side (attenuator cover in place)

    Left side (attenuator cover in place)

  • Right side

    Right side

  • Top

    Top

  • Top

    Top

  • Bottom

    Bottom

  • Rear

    Rear

Switches detail


Components

Some Parts Used in the 1A5

Part Part Number(s) Class Description Used in
7586 154-0306-00 Vacuum Tube (Triode) Nuvistor triode M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311
Retrieved from "https://w140.com/tekwiki/index.php?title=1A5&oldid=90821"