Earth Data PS6-24 Digitizer Specification

INPUT
Number3 or 6
TypeDifferential
Input impedance1 MΩ ±5% to ground, 2 MΩ differential
Input CMRRBetter than -100 dB
Input sensitivity100 nV per bit : 1 μV per bit : 2.5 μV per bit (software selectable)
Input range±0.8 V, ±8 V, ±20 V user programmable
Gain accuracy±0.1 dB (after auto cal)
Analogue responsed.c. to 0.4 of selected sample rate
DC offset±5 μV low gain (after auto calibration)
± 1 μV high gain (after auto calibration)
Offset voltage drift ± 10 μV per °C
± 250 nV per °C (with optional temperature compensation)
CrosstalkBetter than -120 dB, any frequency within passband
A TO D
Number1, 2 or 3 (4, 5 or 6), (software selectable)
TypeEarth Data 7th order Delta Sigma (one per channel)
Sampling frequency192 KHz
Filter typeFIR
Output sampling ratio2.5:1 (all sampling frequencies)
Filter responseLinear phase ±0.1 dB
Alias protection Spurious in band signals better than -120 dB below full scale output as a result of any frequency above the pass-band 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
Analogue responsed.c. to 0.4 of selected sample rate
RMS to RMS noise150 dB below 10 Hz
140 dB below 100 Hz
130 dB below 1000 Hz
Spurious tonesNothing above -144 dB (input short circuit)
Intermodulation productsLess than -120 dB for any two sine wave frequencies within the pass-band at half full scale amplitude
ADDITIONAL FUNCTIONS ON INPUT CONNECTOR
Sensor power12 V ±0.2 V supply available for driving active sensors, 100 mA capability.
Calibration output+5 V, 0 V, -5 V
ADDITIONAL A TO D CHANNELS
Number4
TypeSuccessive approximation
Resolution12 bits
Input range±10 V
Sampling rate1 Hz
OUTPUT
FormatsRS232 bi-directional
Optional RS485 transmit only
RS232 baud rates1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400
RS485 baud ratesAs above
ADDITIONAL FEATURES
Serial numberAll units transmit a unique serial number within the RS232 data
Digital outputsOne TTL level: One open collector to 50 V
System monitoringSupply current, volts and internal temperatures reported in RS232 data
ADDITIONAL FEATURES
HousingExtruded aluminium
WaterproofingTo IP67 standard
Operating temperature-20 to +60 °C
Storage temperature-40 to +125 °C
Relative humidity100% (cased versions only)
POWER
Supply voltage10.5 to 18 V DC
Power consumption
(Without GPS)
3 Channel 1.5 W
6 Channel 2.0 W
DIMENSIONS
Size175 mm x 108 mm x 45 mm
Weight0.75 Kg

This specification is subject to change without notice.