• Designed for calibration of insulation meters and megaohm meters.
• Features four decades with a range from 1 MΩ to 12 GΩ.
• Maximum working voltage is 5 kV DC.
• Operates with an internal accumulator or power line adapter.
• Includes RS232 serial interface for control.

The High Resistance Decade Box, model M-109R, is intended for use in calibration laboratories and service centers. It is suitable for calibrating insulation meters and megaohm-meters, as well as testing or setting high resistance meters. The device uses high voltage relays with extremely high insulation resistance for switching resistance components. It features an indication of input terminal overload and can be controlled manually or remotely via RS232.

• Warm-up time: 1 hour.
• Reference temperature: 23°C ± 5°C.
• Reference humidity: 10 - 50%.
• Power supply: Internal accumulator or 15V power line adapter (100-240V/50-60 Hz).
• Dimensions: 390 x 128 x 310 mm.
• Weight: 4 kg.
• Interfaces: RS232.

• Range: 1 MΩ – 12.221 GΩ.
• Maximum voltage: 5 kV DC between terminals H-L, H-, L-.
• Connection: Two-terminal, three-terminal (GUARD).
• Type of terminals: High voltage terminals with ERTALYTE isolation.
• Isolation resistance of relays: > 10¹⁵ Ω.
• Surface resistance of ERTALYTE: > 10¹⁶ Ω.
• Specific resistance of ERTALYTE: > 10¹⁶ Ωcm.

Note: In the voltage range 0-1kV and temperature range 18-28°C, total accuracy is determined by the basic accuracy of the nominal value. In the voltage range 1-5kV and outside the temperature range 18-28°C, total accuracy is influenced by the voltage and temperature coefficients.