Deimos DAQ - Specs
Specifications refer to performance including applied calibrations.
Values are preliminary and may be adjusted as further test data is collected.
| Feature | Performance |
|---|---|
| Comm. Medium | Ethernet. |
| Power Supply | 24V DC 1A |
| Cycle Rate | 5 Hz - 8000 Hz over Deimos/UDP. 5 Hz - 500 Hz over Modbus/TCP. |
| Multi-Unit Time Sync | ~1 microsecond (100ns typ.) |
| Sample Jitter | 0.01% of Δt |
| Voltage Reference | 0.02% accuracy, ultra-low thermal sensitivity. |
| ADCs | 16-bit SAR, self-calibrating. |
| Internal Samplerate | Nominal 9kHz delayed-simultaneous sampling. Adjusted to synchronize with the reporting rate. See dynamics page for details. |
| Onboard Filtering | Every analog channel has: - Active analog filter. - Digital anti-aliasing filter. - Digital sample synchronization filter. |
Outputs
| Kind | Range | Resolution | Notes |
|---|---|---|---|
| 4x PWM | 1Hz-100kHz | 16-bit | Independent frequencies and duty cycles. 40Ω termination. |
| 4x GPIO Output | 1-bit | 40Ω termination. | |
| 2x DAC (Voltage) | 0-2.5V | 12-bit (0.6mV) | Buffered & calibrated to 0.01%. |
Inputs
| Kind | Range | Accuracy | Resolution | Notes |
|---|---|---|---|---|
| 2x Voltage, 0-2.5V | 0-2.5V | 0.01% | 38uV | Single-ended. ±40V tolerance. |
| 2x Voltage, 0-15V | 0-15V | 0.01% | 228uV | Single-ended. ±40V tolerance. 12kOhm divider; 0.6mA max leakage. Calibrated range is 0-10V. |
| 2x Voltage, ±35mV | -39mV to +55mV | 0.1% | 1.5uV | Single-ended. ±40V tolerance. |
| 2x K-Type Thermocouple | 73-1543K | 0.3K | 0.04K | Cold-junction compensated. Material-matched connector.±40V tolerance. |
| 3x 3-Wire Resistance (RTD, strain, etc) | 73-1073K | 0.1K | 0.02K | Specs refer to use with Pt100 RTD. Also compatible with 100-ohm strain gauges. |
| 4x 4-20mA | 0-33mA | 0.01% | 0.8uA | 24V excitation. 2 or 3-wire. Short-circuit protected. |
| 2x GPIO Input | 1-bit | ±40V tolerance. | ||
| 4x Encoder | Signed 64-bit accumulator. Forward/backward counting. ±40V tolerance. |
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| Diagnostics | Bus current. Bus voltage. Board / cold-junction temp. |
Benchmarks
The operating space of the Deimos DAQ is one-dimensional: everything is a function of cycle rate.
The following benchmark data is collected using a consumer laptop host machine running ubuntu linux with a low-latency usb-to-ethernet adapter.
Networking hardware with added latency can limit maximum cycle rate. As a result, this system performance is typical, but is not guaranteed.