Я4С-91: Difference between revisions

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{{Plugin Sidebar 2 |
{{Plugin Sidebar
title=Я4С-91 |
|manufacturer=Vilnius Research
summary=Dual Timebase |
|series=Soviet 7000-series clones
image=Я4С-91_front.jpg |  
|type=Я4С-91  
caption=Я4С-91 front panel |
|summary=Dual Timebase  
series=[[Soviet 7000-series clones]]|
|image=Я4С-91_front.jpg  
introduced= |
|caption=Я4С-91 front panel  
discontinued= |
|introduced=(?)
category= |
|discontinued=(?)
|designers=
|manuals=
* [http://www.04kn009.de/C1-122-Zeitbasis_R4C-91.pdf Я4С-91 time base manual]
* [https://martinjonestechnology.files.wordpress.com/2017/02/r4c-91-technische-beschreibung-und-betriebsanleitung.pdf Я4С-91 Technical description and instruction manual (in German)]
* [https://martinjonestechnology.files.wordpress.com/2017/02/r4c-91-kennkarte.pdf Я4С-91 Calibration certificate (in German)]
}}
}}
The '''Я4С-91''' is a dual timebase plug-in for [[Soviet 7000-series clones]]. It is roughly analogous to the Tek [[7B52]].
It features two [[Russian tunnel diodes|3И306К tunnel diodes]] in the timebase A trigger circuit.


The '''Я4С-91''' is a dual timebase plug-in for [[Soviet 7000-series clones]]. It is roughly analogous to the Tek [[7B53A]]. It features a 3И306К tunnel diode in the timebase A trigger circuit.
Significant differences to the 7B52 include:
 
* slowest sweep speed 50 ms/div
Significant differences to the 7B53A include:
* no ×10 magnifier, direct access to 5 ns/div speed
* slowest sweep speed 50ms/div
* no x10 magnifier, direct access to 5ns/div speed
* timebase B always runs after timebase A and has no separate trigger
* timebase B always runs after timebase A and has no separate trigger
* timebase mode A+B actually display A intensified by B alternating with B
* delay time is set by a single-turn pot with a reduction drive, and it is not calibrated
* delay time is set by a single-turn pot with a reduction drive, and it is not calibrated
* only timebase B has variable time/div
* only timebase B has variable time/div


The external trigger connector is a СР50-73 type.
The external trigger connector is a СР50-73 type. The trigger level control has no separate slope switch. Trigger levels left of centre are on the falling edge, and those right of centre are on the rising edge. This is similar to the way the trigger level control works on the 7B52. The plugin contains a number of integrated circuits of type 130ЛА3, which is a TTL quad 2-input NAND gate in a surface-mount package, like a 7400.
 
The main interconnect board, which also holds the timing capacitors, is made of a rather weak Paxolin- or FR2-like phenolic paper material rather than fibreglass, and the tracks appear to be silver plated. The example in the photos suffered a crack at one corner which caused a malfunction (triggering only after pressing the single-sweep-reset button, and trace offset to the left).


The example in the photos is labelled in German. A version labelled in Russian also exists.
The example in the photos is labelled in German. A version labelled in Russian also exists.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Time/div | 50ms to 5ns }}
{{Spec | Time/div | 50 ms to 5 ns }}
{{Spec | Trigger modes | norm, auto, single sweep }}
{{Spec | Trigger modes | norm, auto, single sweep }}
{{Spec | Trigger sources | internal, external, external/10, line }}
{{Spec | Trigger sources | internal, external, external/10, line }}
Line 36: Line 42:
<gallery>
<gallery>
Я4С-91_front.jpg | Front  
Я4С-91_front.jpg | Front  
Я4С-91_threequarter.jpg | Threequarter view
Я4С-91_threequarter.jpg | Three-quarter view
Я4С-91_left_side_internal.jpg | Left side internal
Я4С-91_left_side_internal.jpg | Left side internal
Я4С-91_left_side_detail.jpg | Left side detail
Я4С-91_left_side_detail.jpg | Left side detail
Line 48: Line 54:
Я4С-91_capacitor_tape.jpg | Factory-added tape to insulate capacitors from side panel
Я4С-91_capacitor_tape.jpg | Factory-added tape to insulate capacitors from side panel
Я4С-91_switched_pot.jpg | Cam-operated microswitch to select variable time/div
Я4С-91_switched_pot.jpg | Cam-operated microswitch to select variable time/div
Я4С-91_interconnect_board.jpg | Interconnect board (Timebase B and output amplifier removed)
Я4С-91 right internal.jpg
Я4С-91 left internal.jpg
</gallery>
</gallery>
[[Category:Soviet 7000-series clones]]
[[Category:Vilnius Research Institute products]]

Latest revision as of 08:40, 15 August 2021

Vilnius Research Я4С-91
Dual Timebase
Я4С-91 front panel

Compatible with Soviet 7000-series clones

Produced from (?) to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Я4С-91 is a dual timebase plug-in for Soviet 7000-series clones. It is roughly analogous to the Tek 7B52. It features two 3И306К tunnel diodes in the timebase A trigger circuit.

Significant differences to the 7B52 include:

  • slowest sweep speed 50 ms/div
  • no ×10 magnifier, direct access to 5 ns/div speed
  • timebase B always runs after timebase A and has no separate trigger
  • delay time is set by a single-turn pot with a reduction drive, and it is not calibrated
  • only timebase B has variable time/div

The external trigger connector is a СР50-73 type. The trigger level control has no separate slope switch. Trigger levels left of centre are on the falling edge, and those right of centre are on the rising edge. This is similar to the way the trigger level control works on the 7B52. The plugin contains a number of integrated circuits of type 130ЛА3, which is a TTL quad 2-input NAND gate in a surface-mount package, like a 7400.

The main interconnect board, which also holds the timing capacitors, is made of a rather weak Paxolin- or FR2-like phenolic paper material rather than fibreglass, and the tracks appear to be silver plated. The example in the photos suffered a crack at one corner which caused a malfunction (triggering only after pressing the single-sweep-reset button, and trace offset to the left).

The example in the photos is labelled in German. A version labelled in Russian also exists.

Key Specifications

Time/div 50 ms to 5 ns
Trigger modes norm, auto, single sweep
Trigger sources internal, external, external/10, line

Links

Pictures

  • Front

    Front

  • Three-quarter view

    Three-quarter view

  • Left side internal

    Left side internal

  • Left side detail

    Left side detail

  • Timebase A PCB

    Timebase A PCB

  • Tunnel diode in Timebase A trigger

    Tunnel diode in Timebase A trigger

  • Right side internal

    Right side internal

  • Right side detail

    Right side detail

  • Timebase B PCB

    Timebase B PCB

  • Output amplifier PCB

    Output amplifier PCB

  • Closeup of PCB construction

    Closeup of PCB construction

  • Factory-added tape to insulate capacitors from side panel

    Factory-added tape to insulate capacitors from side panel

  • Cam-operated microswitch to select variable time/div

    Cam-operated microswitch to select variable time/div

  • Interconnect board (Timebase B and output amplifier removed)

    Interconnect board (Timebase B and output amplifier removed)

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