3 Preparation for use EFA-200/-300
3-4
3.3 Preparing for B-field measurements
3.3.1 Measurement setup
The complete measurement setup for measuring a B-field consists of:
• the Basic Unit
• an external B-Field Probe (optional)
No person or object should be between the radiation source and the probe
while the measurement is being made.
3.3.2 Selecting the probe type
B-Field Probes are used to measure magnetic fields. Three different types
are available for use in different environments or for different measurement
purposes.
• Internal B-Field Probe
– The internal B-Field Probe is used when fields are to be detected and
measured with a minimum of work.
– Measurement accuracy: approx. 6 %
• External B-Field Probe with d = 3 cm
– This very small B-Field Probe can be used for pinpoint
measurements in locations that are narrow or difficult to access.
– Measurement accuracy: approx. 6 %
• External precision B-Field Probe with 100 cm
2
cross-sectional area
– A probe with an effective cross-sectional area of 100 cm
2
is stipulated
for measurements conforming to VDE standard 0848. The large
surface eliminates the effects of small eddy fields and guarantees
highly accurate measurements.
– Measurement accuracy: approx. 3%
Note: Physical constraints result in a higher background display level
when the built-in B-Field Probe and the external 3 cm diameter
B
field probe are used.
It is possible that the sensitive measurement ranges are only
completely usable when the external precision B-Field Probe with
100 cm
2
cross-sectional area is used.
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