Minimum_Requirements.pdf

Brand Name or Equal Requirement

The USDA-NRCS Texas State Office has a requirement for __EM38-MK II Geonics ground conductivity meter Or Equal. In order to be determined an acceptable equal, minimum specifications which must be met are:

Kit to include

1. EM38-MK II Geonics ground conductivity meter (or equal) with shipping case.

2. Extender Arm

3. Monopole Automatic Calibration Stand

4. Data Acquisition System

DAS-AR Archer Field PC to include battery, charger, software and interconnect cables

5. Hemisphere DGPS Model XF 101 to interface with Archer Field PC unit

EM38-MK II

Measured Quantities:

1: Apparent conductivity in millisiemens per metre (mS/m) 2: In-phase ratio of the secondary to primary magnetic field in parts per thousand (ppt)

Intercoil Spacing: 1 and 0.5 metres

Operating Frequency: 14.5 kHz

Measuring Range: Conductivity: 1000 mS/m In-phase: ± 28 ppt for 1 m separation In-phase: ± 7 ppt for 0.5 m separation

Measurement Resolution: ± 0.1 % of full scale

Measurement Accuracy: ± 5 % at 30 mS/m

Noise Levels: Conductivity: 0.5 mS/m; In-phase: 0.02 ppt

Data Output: RS-232 serial port, Bluetooth

Power Source: 9 V disposable battery; external rechargeable battery pack

Battery Life: Up to 5 h continuous for MN1604; 12 h continuous for L522; 25 h for rechargeable battery pack

Operating Temperature: -40° C to +50° C

Weight: 11.9 pounds

DAS70-AR

Processor: Intel XScale PXA270, 520 MHz

Operating System: Windows Mobile 6.1

Memory: 128 MB RAM

Data Storage: 512 MB internal disk storage; SD and CF slots

Display: High visibility active matrix TFT color LCD (240 x 320 pixels)

Communications: RS-232 serial; USB Mini-A; USB Mini-B; Bluetooth

Power Source: Rechargeable Li-Ion battery

Battery Life: Up to 20 h on one charge

Operating Temperature: -30° to +55° C

Weight: 1.1 pouns