Earth Data EDR-209 Digitizer Specification
| GENERAL | |
| No. of channels | 3 or 6 differential input |
| Input impedance | 1 MΩ (any input to ground) |
| Input CMRR | Better than -100 dB |
| Number of gain ranges | 3 (very low gain; low gain; high gain) |
| Input sensitivity | 0.1 µV, 1 µV or 2.5 µV per bit (24-bit word size) |
| Input range | ±0.8 V, ±8 V, ±20 V user programmable |
| Gain accuracy | Within 0.1 dB after auto-calibration |
| D.C. offset | ±5 µV low gain and very low gain; ±1 µV high gain. |
| Offset drift | ±10 µV per °C ± 250 nV per °C (with optional temperature compensation) |
| Crosstalk | Better than -120 dB |
| A TO D CONVERTERS | |
| Number of A to D converters | 3 or 6 (one per channel) |
| Type | Earth Data proprietary Delta Sigma Converter |
| Sampling frequency | 192 KHz |
| Filter type | Linear pahse |
| Alias protection | Spurious in band signals better than -120 dB as a result of any frequency above the passband and any amplitude up to full scale. |
| Primary sample rates | 1, 2, 4, 5, 10, 20, 25, 40, 50, 75, 100, 120, 125, 150, 200, 250, 300, 375, 500, 600, 750, 1000, 2000, 3000 |
| Secondary sample rates | As above (3 channel unit); Sub-division of primary rate (6 channel unit) |
| RMS to RMS noise | 150 dB below 10 Hz 140 dB below 100 Hz 125 dB below 1000 Hz |
| Analogue response | d.c. to 0.4 of selected sample rate |
| Spurious tones | Nothing above -160 dB (input short circuit) |
| Intermodulation products | Less than -120 dB for any two sine wave frequencies within the passband at half full scale amplitude. |
| Timing accuracy | Better than ±10 µs (GPS locked) |
| Sensor power | 12 V ±0.2 V available on input connector. (100 µA current limited) |
| AUXILLARY INPUT CHANNELS | |
| Number of channels | 4 |
| Type of conversion | Multiplexed successive approximation; 16 bit |
| Input range | ±10 V |
| Sampling Rate | 1 Hz |
| OUTPUT | |
| Available interfaces | Ethernet TCP/IP; RS232; USB |
| Internal storage | FLASH (allows more than 3 hours history at 100 Hz. Expandable by fitting internal COMPACT FLASH |
| ADDITIONAL FEATURES | |
| Digital outputs | One TTL level output; One open collector to 50 V |
| GPS | Internal and/or external options available |
| ENVIRONMENTAL | |
| Housing | Extruded alluminium |
| Water proofing | To IP67 standard (water only) |
| Operating temperature | -20 to +60 °C |
| Storage temperature | -40 to +80 °C |
| POWER REQUIREMENTS | |
| Supply voltage range | 10.5 V to 28 V |
| Power consumption | 800 mW (no comms 3 channel unit); 1.2 W (ethernet, 3 channel unit); 1.5 W (ethernet and USB. 3 channel unit) |
| SIZE AND WEIGHT | |
| Dimensions | Length: 180 mm; Width: 108 mm; Depth: 45 mm; |
| Weight | 1.2 Kg |
This specification is subject to change without notice.
