What is it?

The BMR-L series programmable resistance modules use RF magnetic latching relays as the switch for the resistance network. The relay coils do not heat up during operation, which makes this solution capable of generating resistance outputs of the closest performance to that of fixed-value resistors.

The standard version of BMR-L series has a 4-wire output ( to avoid the influence of terminals), step resolution can reach 10mΩ, conservative initial accuracy up to ±(0.015%R.D+20mΩ), typical temperature drift is 10ppm. In addition, it is equipped with a inexpensive networking communication interface (e.g., RS-485) and does not require additional paid software, so users can fully consider using this series as an alternative to the “PXI Programmable Resistor Card”.

BMR-L series supports 6~24V wide voltage power supply and optional rich communication interfaces (isolated RS-485, RS-232 and CAN), of which RS-485 supports maximum 256 nodes for networking.

Why did you make it?

Inherited from QR10 series, BMR-L series is more suitable for industrial application scenarios.

What makes it special?

• Real resistance generated by the “RF relay-resistor network”.
• Fast output response: <3ms
• Suitable for small signals, e.g. for bridges
• Large range, high resolution: Standard version 1Ω -111.111kΩ (in 0.01Ω steps)
• High accuracy (@Tcal ±1°C): 1Ω - 111.111kΩ: ±(0.015%R.D+0.02Ω)
• Low temperature drift: Better than ±(10ppm+2mΩ)/K over full scale
• Output resistance can be set to open circuit
• Output threshold safety limit (user-definable)
• Optional rich communication interface, support user-defined baud rate: Isolated RS-232 Isolated RS-485 (suitable for remote module networking) Isolated CAN (suitable for automotive industry networking)
• 35mm DIN rail mounting
• Small size: 12.2 (L) x 7.2 (W) x 3.5 (Thick) cm