User`s guide

9-6 Agilent 4155C/4156C User’s Guide Vol.2, Edition 6
Built-in Functions
DELTA
DELTA
Returns the difference of the expression.
Syntax DELTA(expression)
The difference is defined as follows:
δn = (a
2
− a
1
) when n = 1
δn = (a
n+1
− a
n−1
)/2 when 1 < n < N
δn = (a
N
− a
N−1
) when n = N
Where,
δn: difference for measurement index number n.
a
n
: value of an expression for measurement index number n.
N: number of sweep steps or number of samples.
For each primary sweep, use same definition as for basic sweep measurement and
assume measurement index number 1 for the first step of each primary sweep.
If expression is a data variable for a secondary sweep source, this function returns
the sweep step value of the secondary sweep.
Example To return the difference of ID:
DELTA(ID)