Testing Your Laboratory Balance Page 4
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6Cornerload
Cornerload testing verifies that the instrument delivers the same weight reading, regardless of
where on the weighing pan the object being weighed is placed. Cornerload performance
specifications are often not advertised. Typical tolerances are shown below.
1. Select a test weight close to the weighing capacity of the instrument.
2. Place the test weight in the center of the weighing pan. Then re-zero the display.
3. Move the weight one half way from the center to the front edge of the pan. Record the
reading on the "Cornerload Chart" under the heading "FRONT."
4. Repeat step 3 at the half way locations for right, rear, and left edges, recording the
readings in the appropriate spaces in the chart.
5. Cornerload tolerances are often not a component of advertised specifications. The table
below shows typical tolerances for instruments operating in both laboratory and industrial
conditions. The lab environment presumes a specially built, leveled, rigid table and
uninterrupted temperature control within one degree Fahrenheit. The industrial
environment includes a sturdy table and uninterrupted temperature control within four
degrees Fahrenheit.
Cornerload Chart
Front
Right
Rear
Left
Lab Environment Cornerload Tolerances (digits)
Resolution
.1 g
.01 g
.001 g
.000 1g
.00001 g
Capacity
30 gram
-
-
-
2
5
100 g
-
-
2
4
10
300 g
-
2
4
10
-
1000 g
2
4
10
-
-
3000 g
3
6
-
-
-
10 Kg
4
-
-
-
-
30 Kg
12
-
-
-
-
Industrial Environment Cornerload Tolerances (digits)
Resolution
.1 g
.01 g
.001 g
.0001 g
.00001 g
Capacity
30 gram
-
-
-
4
10
100 g
-
-
4
8
20
300 g
-
4
8
20
-
1000 g
4
8
20
-
-
3000 g
6
12
-
-
-
10 Kg
8
-
-
-
-
30 Kg
24
-
-
-
-
IES Corporation
Repair of Laboratory Balances
(800) 541-0852
www
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