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DS2401 Resistive Sensor Simulation Board

Simulating resistive sensors

The DS2401 Resistive Sensor Simulation Board makes it possible to simulate resistive sensors, such as thermistors or resistance temperature detectors (RTDs) for temperature measurement.

Application Areas 

In hardware-in-the-loop applications, the simulation of sensors plays an important role. While many sensors provide voltages or currents, others have a resistance output, for example, thermistors or resistance temperature detectors (RTDs) for temperature measurement. To simulate these resistive sensors, precise resistance values must be provided.

Key Benefits

The DS2401 features four resistance output channels with an identical structure. All channels are insulated from system ground individually. The application running on the processor board writes the desired resistance to the DS2401 board, and the resistance is then simulated electronically between the two output pins of that channel. 

Parameter Specification
General
  • 4 simulated resistors
  • 12-bit resolution
  • Default resistance output during power-down (determined by external resistor)
  • Overload relay state output
Resistor terminals Resistance range
  • n 10 Ω ... 500 kΩ total resistance range (programmable)
  • Automatic range switching for each channel (by software): 10 Ω ... 250 Ω, 200 Ω ... 5 kΩ, 2 kΩ ... 50 kΩ, 20 kΩ ... 500 kΩ
Cutoff frequency (-3 dB)
  • 15 kHz (10 kHz at R > 50 kΩ)
Settling time to 1%
  • 50 μs
Voltage across resistor
  • Max. ±20 V
Load current
  • Max. ±20 mA
Initial offset voltage error
  • ±3 mV
Initial resistance error
  • ±0.3% + 0.5 Ω
Total linearity error
  • ±2 LSB
Monotonicity
  • 12 bit
Offset drift
  • ±100 μV/K
Resistance drift
  • ±40 ppm/K
Noise voltage
  • 10 mVrms (at 1 kΩ)
Isolation
  • All channels individually insulated from system ground
Overload relay state outputs Voltage output range
  • TTL
Output current
  • Max. -0.4 mA/+4 mA
DEF_EN output Voltage output range
  • TTL
  Output current Max. -0.4 mA/+20 mA
Triggering
  • By software from master processor board; immediate output or simultaneous update
Physical connections
  • 25-pin female Sub-D output connector
Host interface
  • One 8- or 16-bit ISA slot (power supply only)
Physical characteristics Physical size
  • 340 x 125 x 15 mm (13.4 x 4.9 x 0.6 in)
Ambient temperature
  • 0 ... 70 °C (32 ... 158 °F)
Power supply
  • +5 V ±5%, 0.6 A
  • +12 V ±5%, 1 A

 

 

 

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