The Key values that can be used to create new columns in the data table are:
AVE The average value during shown time.
MIN The minimum value during shown time.
MAX The maximum value during shown time.
IDT The signal integrals during shown time. Dt is in seconds.
SUM arithmetic sum of the measured values during the time shown. Sx
SQRSUM sum of the squares of the measurement values. Sx2
N Number of measurements displayed.
CURSOR1 measured value in the position where marker 1 is located.
CURSOR2 measured value in the position where marker 2 is located.
ONLINE Last recorded value of an online recording.

The syntax for creating key values is illustrated by this formula that actually calculates variance: KEYVAL Variance = (SQRSUM -2 * SUM * MEAN + (MEAN^2) * N)/N

It is then easy to add a column that shows the standard deviation. Here is how it’s done: KEYVAL “Standard deviation” = SQRT(Variance)

As you can see, all these key value calculations begins with the keyword KEYVAL. This tells EasyView what to do with what’s coming next.

In summary, the syntax looks like this: KEYVAL name=expression. Allowed operators in “expression” are the arithmetic and operators. Variables in “expression” are keywords. Note that signals (=variables, channels) and vector functions cannot be used.