Я4С-97

The Я4С-97 is a digital multimeter plug-in for Soviet 7000-series clones. It is roughly analogous to the Tek 7D13.

Manuals – Specifications – Links – Pictures

Significant differences to the 7D13 include:

• 2 kV and 20 kV ranges using an external 100:1 probe
• mode and range switches are separate
• probe connector is a Soviet 8-pin rectangular type
• all modes except current need a special probe

Key Specifications

Voltage ranges	2 V to 20 kV in decade steps
Current ranges	2 mA to 2 A in decade steps
Resistance ranges	200 Ω to 2 MΩ in decade steps
Temperature range	−40 to 120 °C

The internal architecture of the Я4С-97 seems to be very similar to the 7D13, even down to the 2 kHz clock and the transistor-based temperature sensor (which uses a transistor type 2T3316-1 as the probe). However, there is no DAC included for the readout, because the mainframe readout interface is digital, not analogue.

Pictures

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  Front

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  Three-quarter view

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  Analogue board

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  Switch wiring detail

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  Temperature readout

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  Voltage and resistance probe

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  EHT probe (2 kV and 20 kV)

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  Temperature probe

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  Replacement temperature sensor

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  Probe connector

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  Probe plugged in