Thunder Scientific 2500 series, Руководство по эксплуатации и обслуживанию

Страница: 47 / 117

3-11
3.3.2 Coefficients and Parameters
Each of the values on the various coefficient and parameter screens will be discussed in detail
in the following sections.
3.3.2.1 Temperature Coefficients
The ZERO, SPAN, and LIN values are coefficients to the formula
Temp = A + Bx + Cx 2
where A = zero coefficient
B = span coefficient
C = linearity coefficient
x = output of the STD-A/D converter board.
These coefficients are automatically computed during temperature calibration (section 4.2.2).
AVG is the amount of averaging applied to the displayed value. Averaging is applied with
the formula
New Value = {(Previous Value *AVG) + New Reading}/(AVG + 1)
An AVG of zero (0) effectively eliminates averaging. An AVG which is very large has a
correspondingly large averaging affect. Non-integer averaging amounts are allowable;
however, negative amounts should never be used. An AVG of approximately 10 is typical,
while an AVG of 1000 would be excessively high.
The date indicated at the bottom of the screen is the last date of calibration or the date of the
most recent editing of any of the listed values. The date shown may not be edited and is
updated automatically during calibration or when changing coefficients on this screen.
SATURATION TEMP, Ts
Zero
[-.0851657 ]
Span [ .0200085 ]
Lin [ 4.85408E-09 ]
Avg [ 10 ]
Last Cal Date
08/10/12
EDIT
NEXT
PREV
DONE