3.4.1 The output of the analysers should be recorded
both during the test and during all response checks (zero and span).
This data should be recorded on a strip chart recorder or other types
of data recording devices.
3.4.2 For the evaluation of the gaseous emissions,
a 1-Hertz minimum chart reading of a stable 10-minute sampling interval
of each load point should be averaged. The average concentrations
(conc) of NOx, O2 and/or CO2, if required, and
optionally CO and HC, should be determined from the averaged chart
readings and the corresponding calibration data.
3.4.3 As a minimum, emission concentrations, engine
performance and ambient condition data should be recorded over the
aforementioned 10-minute period.