Campbell CS110 - Overview

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(1) Nylon Electrode Cleaning Brush
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(1) CS110 Stainless-Steel Mast Mounting Bracket
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(1) CM110 Stainless-Steel Body Grounding Clamp
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(2) Screw #10-32 x .500 Pan Phillips, Stainless Steel
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(1) CS110 Stainless-Steel Mast Clamp Bracket
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(4) Screw 1/4-20 x 2.250 Cap Hex, Silicon Bronze
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(4) Stainless-Steel Flat Washer 1/4
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(1) Desiccant 4-Unit Bag
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(1) Black Cold Shrink Tape
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(1) Loctite Anti-Seize Stick
The following accessories (ordered separately) are often shipped with the CS110:
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CS110CBL1-L RS-232 (DTE) cable for connecting to a computer or communication device.
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CS110CBL2-L CS I/O cable for connecting to a Campbell Scientific peripheral device such as
the NL201, NL241, and FC100.
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CS110CBL3-L Power cable for connecting to the power supply of another data logger.
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Zero Electric Field Cover for checking the electric field offset voltage of the CS110.
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CS110FV In-Field Verifier for verifying a CS110 factory calibration.
4. Overview
The CS110 uses a reciprocating shutter instead of the traditional rotating vane field mill. The
reciprocating shutter is electrically connected to ground potential by a flexible stainless-steel
strap. The strap operates below its fatigue limit, resulting in an ultra-reliable electrical ground
connection to the shutter (Figure 4-1 (p. 4)).
The reciprocating approach provides better low-frequency error performance than the
traditional rotating vane field mill because it has a convenient zero-field (closed shutter)
reference. The zero-field reference allows the CS110 to measure and then correct for electronic
offset voltages, contact potentials, and leakage currents of each individual measurement (U.S.
Patent No. 7,109,698).
The CS110 also contains circuitry to measure and compensate for insulator leakage currents
occurring on the charge amplifier input, eliminating measurement errors caused by fouled
insulators. If insulator surfaces become conductive because of surface contamination, a leakage
current compensation circuit applies an equal and opposite polarity current to the charge-
amplifier input that prevents saturation of the electronics.
CS110 Electric Field Meter 3