8.7 Troubleshooting
Repeated Status code 12s when the CS110 is clean may be solved by replacing the capacitor.
The operating system does a charge amplifier self-check which involves exercising the charge
amplifier by means of applying a known voltage change to the charge amplifier input using 4.7 pf
capacitor C58. The output limits for the measured voltage were determined empirically by
characterizing some typical units, then adding ±10% to the average or typical value. The intent
was to prevent an unstable charge amplifier from providing incorrect measured data. The critical
components in the charge amplifier performance are the TLC2201 (10599) op-amp, the 330 pf
capacitor C59, and probably the 4.7 pf capacitor C58. Leaky relays or leakage due to residual flux
could also cause problems with the charge amplifier as it is a very high impedance input circuit.
9. References
“Lightning Physics and Effects” by Vladimir A. Rakov and Martin A. Uman, Cambridge University
Press, 2003.
“The Electrical Nature of Storms” by Donald R. MacGorman, and W. David Rust, Oxford University
Press, Inc., 1998.
“On some determinations of the sign and magnitude of electric discharges in lightning flashes”
by C.T.R. Wilson, Proceedings of the Royal Society, Series A, Vol. 92, 555-574, 1916.
“Industrial Electrostatics – fundamentals and measurements” by D.M. Taylor and P.E. Secker, John
Wiley & Sons Inc. 1994, pg. 36-38.
[LPLWS] "LPLWWS handbook" by NASA, April 2003
NAVSEA OP 5, Vol 1, Seventh Rev. Para 6-2, pg 6-1 and 6-2, 2001.
CS110 Electric Field Meter 33
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