Я4С-102

The Я4С-102 is a dual delay line plug-in for Soviet 7000-series clones. It is roughly analogous to the Tek 7M11.

Significant differences to the 7M11 include:

• faster risetime spec (150ps instead of 175ps)
• shorter delay (70ns instead of 75ns)
• СР50-262 connectors instead of GR874
• separate trigger outputs instead of switchable trigger output
• trigger and signal outputs both attenuated 2:1

The signal inputs and outputs are СР50-262 type, which are similar to N connectors. N connectors will fit, just about, but the thread doesn't fully engage. The trigger outputs are СР50-73 type.

The sample in the photograph has a measured 125ps risetime, though with a couple of nanoseconds of 'sag' after the leading edge. This corresponds to a bandwidth of nearly 3GHz.

The plugin is extremely heavy at 3.7kg (8lb 2oz). It is entirely passive, having no edge connector on the rear, and can be used independently of the oscilloscope mainframe. In fact, it doesn't even have a locking screw to hold it in to the mainframe at all.

Key Specifications

Impedance	50 Ω
Delay time	70 ns
Signal risetime	< 150 ps
Trigger risetime	< 500 ps
Maximum input voltage	2V

Pictures

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  Front

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  Three-quarter view

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  Rear view

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  Я4С-102 with Tek CSA803A testing risetime

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  Detail of interconnections of Я4С-102 and CSA803A/SD24/SD22 sampling heads

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  Trigger and delayed signal outputs

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  Delayed signal output risetime

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  Trigger output riestime