Earth Data EDR-209 Digitizer Specification

No. of channels3 or 6 differential input
Input impedance1 MΩ (any input to ground)
Input CMRRBetter than -100 dB
Number of gain ranges3 (very low gain; low gain; high gain)
Input sensitivity0.1 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 accuracyWithin 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)
CrosstalkBetter than -120 dB
Number of A to D converters3 or 6 (one per channel)
TypeEarth Data proprietary Delta Sigma Converter
Sampling frequency192 KHz
Filter typeLinear 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 rates1, 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 ratesAs above (3 channel unit); Sub-division of primary rate (6 channel unit)
RMS to RMS noise150 dB below 10 Hz
140 dB below 100 Hz
125 dB below 1000 Hz
Analogue responsed.c. to 0.4 of selected sample rate
Spurious tonesNothing 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 accuracyBetter than ±10 µs (GPS locked)
Sensor power12 V ±0.2 V available on input connector. (100 µA current limited)
Number of channels4
Type of conversionMultiplexed successive approximation; 16 bit
Input range±10 V
Sampling Rate1 Hz
Available interfacesEthernet TCP/IP; RS232; USB
Internal storageFLASH (allows more than 3 hours history at 100 Hz. Expandable by fitting internal COMPACT FLASH
Digital outputsOne TTL level output; One open collector to 50 V
GPSInternal and/or external options available
HousingExtruded alluminium
Water proofingTo IP67 standard (water only)
Operating temperature-20 to +60 °C
Storage temperature-40 to +80 °C
Supply voltage range10.5 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)
DimensionsLength: 180 mm; Width: 108 mm; Depth: 45 mm;
Weight1.2 Kg

This specification is subject to change without notice.