Thermo Scientific RO-20, Operating Manual

Page: 10 / 37

1-4 RB-XXX-XXXXXX E RO-20
Löw 08.10.2008
1.4 General Specifications
1.4.1 Ranges Five linear ranges
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0–5 mR/h
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0–50 mR/h
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0–500 mR/h
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0–5 R/h
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0–50 R/h
1.4.2 Meter
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Scale length: Approx. 3 in. (7.6 cm)
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2% accuracy.
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Linear markings: From 0 to 5 in 50 minor increments.
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Back-lighted.
1.4.3 Response Time
Five seconds, 0 to 90% of final reading.
1.4.4 Linearity
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Within ± 5% of full scale
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Battery Dependence (Within ± 5%)
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The reading is independent of battery voltage when the battery check indications are in
the green arc. In order to achieve, but linearity in the 50R/h Range, it is recommended
to exchange the 3 ea 12 Volt batteries (indicated by “Battery 2”) once the needle falls
below “4.0”.
1.4.5 Controls
1.4.5.1 External
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Function Switch with Off, Zero, and Battery checking positions.
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The Zero Knob is used to set the meter to zero when the Zero position of the Function
Switch is selected, or when the detector is not in a significant radiation field.