PSI System Controls and Diagnostics
F3200E User Manual
F3200E_UM_180726 Page 43 of 107
11.4.5 Filtering
The PTC Diagnostic G2 can apply low-pass filtering to the displayed data to allow longer term
trends to be seen more clearly. This is in addition to averaging performed by the F3200E itself.
The filter is a simple exponential IIR type
Yi = Xi/A + (1 - 1/A)Yi-1,
where Yi is the latest output of the filter, Yi-1 is the prior output of the filter and Xi is the latest
reading from the F3200E. A is the averaging value from the drop-down list.
Figure 25. Filtering selections.
Note that the data is not altered, only the way it is displayed, so you can change between various
filtering settings at any time.
11.4.6 Zero offset suppression
The F3200E should have low offset currents when it is calibrated. However there may be offsets
from the sensor system that you wish to suppress. If you press the Zero button (
/
),
the signal at that time is captured for each channel and subtracted from subsequently displayed
data. Press the clear button
to turn off the zero correction. Note that the data is not altered,
only the way it is displayed, so you can turn zeroing on or off at any time.
11.5 Data logging
The PTCDiagnosticG2 software has a data buffer which can accumulate up to 100000 samples,
at which point it starts overwriting the oldest data. Accumulation starts automatically when you
click Initiate. You can capture the contents to a .csv format file at any time using the Save button
. Pressing the Clear button
clears the buffer and restarts the logging. The csv file includes
timestamps, a trigger count which increments from 1 to 256 with each acquisition, an overrange
indication and the 32 channels of current data.
11.6 Data panel
The 32 channels of data are displayed in amperes in exponential format. The units drop down
allows you to scale the displayed values into mA, µA or nA. Colour-coded boxes correspond to
the colours of the graphic traces, and you can suppress the graphic display of any number of the
channels by unchecking the appropriate channels. Use the vertical scroll bar to reveal the higher-
numbered channels.
