Fields at Work ExpoM-ELF, User Manual

Page: 18 / 19

Fields at Work GmbH, Sonneggstrasse 60, 8006 Zürich, Schweiz
2017 Fields at Work GmbH, Zurich
ExpoM - ELF manual rev. 1.1
Page 18/19
6.4 Accuracy and Drift
Band
Basic Accuracy
25°C ±10°C
Typical DC Offset
25°C ±10°C
Temperature Drift
0
°C
to +50
°C
Axis Crosstalk
LF ± 3% ± 5 μT
Sensitivity: 0.1% /
°C
DC Offset: <0.8 μ T /
°C
< 30 dB
MF ± 3% ± 5 μT < 25 dB
HF ± 3% ± 5 μT < 10 dB
High-B ± 3% ± 0.05 mT
Sensitivity: 0.05% /
°C
Offset: <2.5 μ T /
°C
< 25 dB
6.5 Linearity
Total Harmonic Distortion Band Test Condition
< -45 dB LF Band 100 μT RMS; Sinusoidal field at f = 100 Hz
< -45 dB MF Band 100 μT RMS; Sinusoidal field at f = 1 kHz
< -45 dB HF Band 100 μT RMS; Sinusoidal field at f = 10 kHz
< -45 dB High-B Band 1 mT RMS; Sinusoidal field at f = 100 Hz
6.6 Automatic Data Logging
All measurements performed with the device are automatically stored to the internal memory. The
device can be configured to take a measurement on one or multiple bands (see 6.2) within one
measurement interval. If multiple bands are selected it may be necessary to increase the
measurement interval. The recommended minimum measurement interval settings are given in the
following table (Table 2).
Measurement Settings GPS ON GPS OFF
One band 4 seconds 4 seconds
Two bands 5 seconds 4 seconds
Three bands 6 seconds 5 seconds
All bands (LF + MF + HF + High-B) 7 seconds 6 seconds
Table 2: Recommended minimum measurement interval
Selecting a measurement interval shorter than the recommended value may lead to individual
samples being taken at irregular (i.e. longer than expected) time intervals.
6.7 Connectivity and Data Management
Time Integrated precision (± 2 ppm) real time clock
Connectivity USB interface (Micro-USB), Wi-Fi (802.11b/g/n), GPS/GLONASS receiver
Marker Built-in marker button to highlight specific events or trigger measurements
Storage Internal data logger memory for >250’000 measurements