tsscheck: Check timestamp shifting

In AgroCares/gasanalysr: Functions to process and analyse data from Gasera one

Check timestamp shifting

Description

The gasanalyser displays a different timestamp for a measurement during measuring than the actual timestamp as given in the output file. This is inconvenient for anyone operating the machine on multiple samples in a single measurement round where one has to manually log timestamps to match measurement points with samples.

Usage

tsscheck(dtm, max.amb.h2o = 20000)

Arguments

dtm	(data.table) data table to be checked
max.amb.h2o	(numeric) Maximum background H2O concentration in ppm is 20000 by default

Details

This function attempts to guess whether the operator manually corrected for disparity between displayed and actual measurements -the merge should have been smooth, no correction is needed- or that some post measurement correcting is needed. This is done by comparing the H2O concentrations measured at the beginning of a measurement round (before the first timestamp is matched to a sample) with the H2O concentrations at times merge to a sample. It is assumed that the humidity of an actual measurement is higher than that of the ambient room. So if a sample has comparable humidity to the background it is likely that shifting has taken place and the samples actual measurement was actually the previous measurement.

AgroCares/gasanalysr documentation built on Oct. 1, 2022, 11:55 p.m.