Blog from January, 2017

A post check of the TRH probes was completed.  The temperature pre-project calibration was from  40^o C to -30^o C in 5^o C steps.
The post project check for temperature was the same. For humidity the pre-project calibration covered the range of 10% to 90%, 10% steps,
at 4 temperatures; 40^o C, 27^o C, 14^o C, and 0^o C. For post project check the probes were tested from 40% to 90%, 10% steps, at 23^o  C.
This range was selected since it represented the conditions the probes were subjected to.

The table below presents the errors of the probe. The error term is computed as: err = probe - reference

A post cal on the barometers used in VERTEX showed a systematic basis. The Ruska reference was tested against the
dead weight piston gauge to verify the error was not in the reference. The results of this test showed an agreement
better than .03 mb between the dead weight and Ruska. Based on this result I believe there was an error in the pre-calibration
of the barometers that created the basis. Below are the post cal results. A simple correction is to subtract the mean error from
the measured value. This results in errors better than 0.2 mb. The other option is to apply the linear correction
resulting in errors better than 0.01 mb.
the data.