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DNR-AI-225 |
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| 25-channel, 24-bit, 1 kS/s per channel, simultaneous sampling analog input, data acquisition board for the PowerDNR RACKtangle® |
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True 24-bit resolution makes the DNR-AI-225 an ideal data acquisition board for a wide range of precision sensors, ranging from thermocouples, to seismic detectors, strain gages, and RTDs (requires external excitation). The board offer ultra-high resolution (as low as 0.5 µV at 5 Hz), true 24-bit resolution, one converter per channel with simultaneous sampling, and outstanding linearity. The DNA/DNR-AI-225 features sampling rates starting from 5Hz per channel (with 23.5 bits ENOBs) and up to 1 kHz per channel (19 bits ENOBs). Extremely low long-term gain and offset drifts, as well as drift vs. temperature ratio, allows the AI-225 series to be used in a wide range of applications. |
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| Characteristics: |
- 25 channels
- 24-bit resolution
- One channel can be used for CJC
- 5 S/s to 1000 S/s sampling rates
- Differential inputs of ±1.25V
- Direct connection to thermocouples (using DNA-STP-AI-U terminal panel)
- Ideal for seismic testing, high-precision weight and temperature measurement
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| Technical Specifications |
| Parameter |
| Resolution |
24 bits |
| Number of A/Ds |
25 |
| Sampling rate |
5 Hz to 1000 Hz |
| Onboard FIFO size |
1024 samples |
| Input ranges |
Bipolar |
±1.25V (AIn+ & AIn- within -0.25 ..+5V) |
| Unipolar |
-0.25 .. 1.25V (AIn- connected to AGND directly or via up to 10 kOhm resistor) |
| Input over-/underrange |
software detection |
| 50/60Hz rejection |
> 120dB of AC component for rates < 10Hz |
| Power supply rejection |
> 120dB |
| Common mode rejection |
120dB typical |
| Frontend bandwidth |
1250Hz @ -3dB |
| Input impedance |
100 MΩ |
| Input bias current |
±15 nA |
| A/D conversion time |
145 msec @ 5-Hz sampling,
1.1 msec @ 500-Hz sampling,
0.57 msec @ 1000-Hz sampling |
| System noise |
0.5 µV @ 5Hz, 5.0 µV @ 500 Hz,
7.0 µV @ 1000 Hz |
| Effective number of bits |
23.5 bits @ 5 Hz, 20.0 bits @ 500 Hz,
19.0 bits @ 1000 Hz |
| Nonlinearity |
3 ppm |
Total Harmonic Distortion+N
onlinearity+Noise |
-110 dB |
| Input Protection |
2kV ESD, ±15V over/under voltage |
| Isolation |
350Vrms |
| Power consumption |
3W - 3.9W |
| Operating temp. (tested) |
-40°C to +85°C |
| Operating humidity |
95%, non-condencing |
| Vibration |
IEC 60068-2-6 |
5 g, 10-500 Hz, sinusoidal |
| IEC 60068-2-64 |
5 g (rms), 10-500Hz, broadband random |
| Shock |
IEC 60068-2-27 |
50 g, 3 ms half sine, 18 shocks @ 6 orientations
30 g, 11 ms half sine, 18 shocks @ 6 orientations |
| MTBF |
520,000 hours |
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