Description: | The chopper motor in the "dry" nephelometer (Neph1) stopped working on Julian day 343.15
or 12/9/07 0330 UTC. This motor controls a chopper wheel which alternates the signal
between a "dark" phase, "calibration" phase and signal. Logging on the instrument was turned
off on 12/18/2007 at 0100 UTC.The second nephelometer (Neph2) was used to replace Neph1.
Data logging resumed on day 352 or 12/20/2007 using the replacement neph. From day 347 to
352, Neph 2 was logging data without use of the humidifier. The neph2 data during this
time can be used as the dry neph scattering coefficients. |