Я4С-91: Difference between revisions
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* no ×10 magnifier, direct access to 5 ns/div speed | * no ×10 magnifier, direct access to 5 ns/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 | ||
* 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 | ||
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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) | |||
</gallery> | </gallery> | ||
Revision as of 01:23, 25 May 2018
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 7B53A 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 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 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
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Front
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Three-quarter view
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Left side internal
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Left side detail
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Timebase A PCB
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Tunnel diode in Timebase A trigger
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Right side internal
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Right side detail
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Timebase B PCB
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Output amplifier PCB
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Closeup of PCB construction
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Factory-added tape to insulate capacitors from side panel
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Cam-operated microswitch to select variable time/div
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Interconnect board (Timebase B and output amplifier removed)
