USER GUIDE
Ɩ
EM8500 SERIES
Copyright
2016, EM Microelectronic-Marin SA
EMDVK8500-MN01, Version 2.0, 5-Jul-16
36
420005-A01, 3.0
10.4 MEASURE AND VISUALIZE WINDOWS - ACQUISITION UNIT INFORMATIONS
The graphs receive data from the analog-to-digital converters of the EMDVK8500 hardware.(Base Board)
The sampling rate is set by the drop-down menu below the graphs.
Sampling
Rate select
Figure 10-8 EM8500 DevExplorer visualize sampling rate selector
The time (x) axis (in seconds) is scaled dynamically as more and more samples are received.
The user may zoom into the time (x) or voltage (y) axis as required.
To maximize time resolution in the first seconds after starting a measurement, each sample received from the ADC
is displayed, at up to 12.5 kSamples per second. After several seconds, a decimation of 10 starts (only 1 out of
10 samples is displayed). This decimation is required to avoid excessive amounts of data being collected. After a
few minutes, decimation factor is increased from 10 to 100, then from 100 to 1000, and so on. The longer a
measurement runs, the higher a decimation factor is applied. After stopping and restarting the measurement,
decimation is reset to 1.
Even with decimation, it is possible to zoom into the time axis until individual samples are visible. It is, however, not
possible to zoom into more detail than the decimation allows, because decimated values are discarded
when reading from the ADC.
Data sample received from the ADC contain a time stamp. This time stamp is reset to zero when the EMDVK8500
is power-cycled. It increases continuously in time, even when measurements are stopped. The time stamp
designates the exact moment in time when a sample is taken, regardless of decimation or stopping and restarting
measurements.
Data from the graphs can be logged to CSV file.
Figure 10-9 EM8500 DevExplorer visualize Record and CSV save function
