The DMD4059 accepts an input from full Wheatstone strain bridge sensors, pressure transducers or load cells. It provides filtering, amplifies, and converts the millivolt input signal into the selected dc voltage or current output that is linear to the input. The 3-way 1200V isolation eliminates ground loops, common mode voltages and greatly reduces noise pick-up. Sense wire connections are available to give maximum accuracy. Input, output, excitation and zero offset are field configurable via external rotary and slide switches. Offsets of up to ±100% of span can be used to cancel sensor offsets or tare fixed loads. Features such as red and green LEDs vary in intensity to show input and output activity and an output test button helps with set-up and troubleshooting.
SPECIFICATIONS Input Range (unipolar): Minimum: 0 to 5 mV range, 0.5 mV/V sensitivity Maximum: 0 to 400 mV range, 40 mV/V sensitivity Input Impedance: 200 kΩ typical Excitation Voltage: Switch selectable 0 to 10 Vdc in 1V increments Maximum Output: 10 Vdc @ 120 mA Fine Adjustment: ±5% via multi-turn potentiometer Stability: ±0.01% per °C Sense Lead Compensation: Better than ±0.01% per 1Ω change in leadwire resistance Maximum Lead Wire Resistance: 10Ω with 350Ω @ 10 Vdc Zero Offset (Tare): ±100% of span in 15% increments Output Ranges: Voltage (10 mA max): 0-1 to 0-10 Vdc Bipolar Voltage (10 mA max): ±5 or ±10 Vdc Current: 0-2 mA to 0-25 mA Compliance, Drive @ 20 mA: 20V, 1000&937; drive; current output can be selectively wired for sink or source. Output Linearity, Ripple and Noise: Better than ±0.1% of span, <10 mV rms ripple and noise Output Zero and Span (Fine Adjustment): Multi-turn potentiometers to compensate for load and lead variations, ±15% of span adjustment range typical Function Test Button: Sets output to test level when pressed. Adjustable 0 to 100% of span via potentiometer. Factory default is approx 50% of span. Response Time: 70 ms typical Common Mode Rejection: 100 db min Isolation: 1200 Vrms min, 3-way isolation, power to input, power to output and input to output Operating Temp Range: -10 to 60 °C (14 to 140 °F) Thermal Stability: Better than ±0.02% of span per °C Standard Power: 80 to 265 Vac, 50/60 Hz or 85 to 300 Vdc Low Voltage "DC" Option: 9 to 30 Vdc or 10 to 32 Vac Power Consumption: 2 to 5 W depending upon number of load cells Mounting: Mounts to standard 35 mm DIN rail Environmental Protection: IP40 Connections: Four 4-terminal removable connectors 14 AWG max wire size Dimensions: 22.5 W x 117 H x 122 mm D (0.89 x 4.62 x 4.81"), height includes connectors