MT5 Multi-Tracer Operating Manual
page 44
5. Multi-Tracer Data
The MT5 system collects two types of data; performance data, stored in an MTD file,
and IV curves. Module performance data are collected by electrically loading the
module to simulate operation under real-world conditions. The MT5 system measures
current and voltage of each module and stores this data in the MTD file. IV curve data
are pairs of current and voltage values over the entire voltage range of the module. The
following sections describe these data in greater detail.
5.1. Performance Data
When not taking IV curves, the Multi-Tracer collects continuous data on the PV modules
while operating them under load. Unless IV curves are scheduled frequently, the
modules operate most of the time in this loaded condition.
5.1.1. Data Logging Interval
The primary user setting affecting performance data is the data logging interval or
average period for this data.
For example, if the data logging, averaging interval is set to 10 minutes (the default), the
MT5 averages the 1-second sample data for 10 minutes before writing these average
values to the data file as a data record. To change this value, refer to section 4.3.6
“Data Logging”. Change the value as required. The minimum value is 1 minute
averaging.
These data are stored in Multi-Tracer Data files (MTD files). The Multi-Tracer creates a
single MTD file for each day. These files are stored inside the Multi-Tracer itself. Refer
to the section 5.3
“Accessing Data Files” for how to move the data from the MT5 to your
computer.
Note: All module, temperature and aux input data are stored together in this file using a
single, comma delineated line or record for each data logging interval (average). The