Supplemental Compliance Information - Hach 2100N Instruction Manual

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SUPPLEMENTAL COMPLIANCE INFORMATION

in modulated electric filed of 3V/m over a range of 27–100 MHz
Frequency (MHz)
148.0–407.0
768.9–781.0
901.7–969.0
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The 2100N Turbidimeter shows an accuracy shift when exposed to radio
frequency interference of 3 volts per meter. If the displayed data are not stable
(within the accuracy and repeatability specifications) and other interferences are
not suspected as the cause, inspect the area for portable phones, paging service
tower/antennas, or any other transmitting communication device. For example, if
the user of the instrument detects a measurement deviation while using a hand-
held radio communication device to relay information to a base station, the
interference is clearly caused by the hand-held radio communication device. To
resolve the interference problem, move the hand-held radio communication device
at least 3 to 4 meters from the instrument to provide isolation.
As shown below, the instrument reading may deviate slightly win the presence of
specific frequencies. Any electronic instrument is sensitive to RF fields if the
power is great enough. However, typical transmitting power is limited by
regulatory controls, and field strengths of greater than 3 volts/meter are unusual.
Points of susceptibility for the 2100N Turbidimeter
Nominal Value (NTU) RF Value in RF Field (NTU)
0.095
0.095
0.095
Specification Range (± 2%) (NTU)
0.070–0.091
0.099–0.105
0.100–0.111
79
0.093– 0.097
0.093– 0.097
0.093– 0.097