Я4С-97

Vilnius Research Я4С-97
Digital multimeter Я4С-97 front panel Compatible with Soviet 7000-series clones Produced from 1978 to (?) Manuals to be added (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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

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.