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DNR-AI-208 |
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| 8-channel, 18-bit, 8 kS/s per channel, strain gage analog input, data acquisition board for the PowerDNR RACKtangle® |
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The DNR-AI-208 is an 8 channel bridge data acquisition board with 8 differential input channels designed for direct measurement of full-bridge strain gauges, load cells, force sensors, torque sensors as well as any other full-bridge circuitry-based sensors. Quarter-bridge and half-bridge strain gauges are measured using customer supplied external resistors. Twelve software selectable input ranges combine with 18-bit resolution allow the user to connect various low-level signals directly to the differential inputs of the layer. The board’s 8 kS/s maximum sample rate is divided among used channels. For example, you may sample one channel at 8 kS/s, two at 4 kS/s, four at 2 kS/s, etc.
There are two programmable 14-bit excitation voltage sources with voltage levels from 1.5 V to 10.05 V. The board also offers built in shunt calibration resistors allowing users to install shunt resistors in 256 unique steps ranging from 5k to 205k ohms. |
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| Characteristics: |
- 8 differential channels
- Maximum sampling rate of 8 kHz per channel (total board sample rate limited to 8 kS/s)
- 18-bit resolution
- 2 wiring schemes (4- and 6-wire)
- Gains - 1,2,4,8,10,20,40,80,100,200,400,800
- Overvoltage protection (-40V..+55V)
- Full-, Half- and Quarter-bridge configurations
- Software for onboard shunt calibration
- Per channel built-in averaging engine from 5Hz, 4096 samples to 1000 Hz , 4 samples
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| Technical Specifications |
| Parameter |
| Number of channels |
8 (differential) |
| ADC resolution |
18 bits |
| Sampling rate |
1 S/s - 8 kS/s per channel (8 kS/s max aggregate board sample rate) |
| Input range |
±10V
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| FIFO size |
512 samples |
| Wiring scheme |
4- and 6-wire (with Kelvin connection); all channels share the same ground |
| Bridge configurations |
Full-Bridge
Half-Bridge (with ext. terminal panel)
Quarter-Bridge (with ext. terminal panel) |
| Bridge resistance |
120Ω, 350Ω, 1000Ω, and custom |
| Input impedance |
10MΩ in parallel with 50pF |
| Gains |
1,2,4,8,10,20,40,80,100,200,400,800 |
| Temperature drift |
Offset drift |
5µV/°C typ |
| Gain drift |
30ppm/C° @ G=1, 45ppm/C° @ G=800 |
| Shunt calibration |
Onboard (software selectable) - 256 steps fom 5K to 205K; External |
| Isolation |
350 Vrms |
| Overvoltage protection |
-40V..+55V |
| Excitation voltage |
1.5V - 10.05V (software selectable) |
| Excitation current |
85 mA, per channe |
| Excitation type |
Pulsed. Only the excitation for the channel currently being measured and the next channel in the scan list are enabled. (for overheating protection) |
| Power consumption |
bridge resistance/excitation dependent; 2.5W - 4.5W |
| Operating temp. (tested) |
-40°C to +85°C |
| Operating humidity |
0 - 95%, non-condensing |
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