Dickey-John Instalab 700 NIR, Operator'S Manual

Page: 16 / 111

OPERATOR’S MANUAL
Instalab 700 NIR Product Analyzer
11001-1574-201107
12 CALIBRATIONS
Figure 6
Instalab Bias Adjustment Worksheet Example
( Figure 6 ) depicts twenty laboratory analyses performed with sufficient
accuracy (logged under the Lab Analysis column). Instalab analyses were
also logged under the Instalab Analysis column.
• Each column was added, then divided by the number of samples (SUM
divided by N).
• The Instalab average is then subtracted from the laboratory’s analysis
average.
• The result (“.25” in this example) is the amount of bias adjustment
required to make the Instalab percent analyses agree with the
laboratory determinations.
• Bias adjustments are made by editing the calibration file, known as
“Adj_Bias” parameter.
BIAS ADJUSTMENT
NOTE:
Refer to the System Setup
section, Edit Product, Edit
Consitutent to modify the
“Adj_Bias” value. A bias adjustment is typically required to make a universal calibration agree
with a reference lab. A bias adjustment compensates for machine
differences as well as reference lab differences. Reference labs do not all
agree and this bias adjustment aids in tailoring the unit to a particular
reference lab.
Instalab Bias Adjustment Worksheet
Date: _____________________________ Instalab Serial #: _____________________
Product: ___________________________ Grinder Serial #: ______________________
CONSTITUENT CONSTITUENT CONSTITUENT CONSTITUENT
Sample # (N) Lab
Analysis
(%)
Lab
Analysis
(%)
Lab
Analysis
(%)
Lab
Analysis
(%)
Instalab
Analysis
(%)
Instalab
Analysis
(%)
Instalab
Analysis
(%)
Instalab
Analysis
(%)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Sum
Average
(Sum÷N)
Standard Average
Minus Instalab Average
Equals Bias Change Req'd
Hard Red Wheat
Protein (.2)
10.56
11.02
13.57
12.20
11.67
13.30
12.82
11.60
10.98
12.90
12.37
13.42
10.20
11.06
12.07
12.35
13.50
11.17
11.11
12.07
10.31
10.77
13.32
11.95
11.42
13.05
12.57
11.35
10.73
12.65
12.12
13.18
9.95
10.81
11.82
12.10
13.25
10.92
10.86
11.82
239.95
12.0
234.95
11.75
12.0
11.75
.25