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Checking and Adjusting the Off-Center Loading Error
Caution: Larger errors in the off-center loading error affect the repeatability of the
weighing system!
The OIML Guideline R76-1 describes the tests for off-center loading tolerances for
square, round and even triangular weighing pans. Therefore, the test weight should
be placed on every 1/4 of the weighing pan surface.
The positions for placing test weights in triangular weighing pans are indicated in
the fi gures to the left.
Please refer to the sketches to the left to establish the testing points for checking
the off-center loading tolerances.
The markings should help you place the test weights in their proper positions.
Checking the Off-Center Loading Tolerances
Note: The data for the test weight and the tolerance are listed in the „Adjustment
Datasheet (see Page 42-43).
CP Semimicro-Balances with Rectangular Weighing Pans
Models: CP225D, CP324S, CP224S, CP124S, CP64, GC1603, GC803S, GC803P
- Place the test weight on position 1 on the weighing pan and zero the balance/
scale by pressing the t key.
- In the order given, place the test weight in the position 2, 3, 4 and 5 as indicated
and write down the readout at stability, including the plus/minus signs.
- If the off-center loading error is too large, adjust the balance so that the off-
center loading error is within the tolerances specified.
Adjusting the Off-Center Loading Error (Monolithic System)
Off-center loading errors are determined by carrying out a 3-point adjustment.
The 3-point adjustment shows the greatest possible off-center loading error on the
balance/scale.
Note: You have to open the balance/scale for calibration/adjustment of the off-center
loading error.
- Remove the weighing pan and draft shield ring
- Open the draft shield cover and carefully remove the draft shield
- Remove the Seal of Warranty on the back panel of the balance/scale and the
loosen the thumbscrew (K)
- First, move the top part of the balance/scale to the back and then carefully
lift upwards
- Replace the weighing pan
Note: In the future, two openings in the top part of the balance/scale will make it
unnecessary to remove the housing.
open
closes
K
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Eck_dr_mo3.eps
Checking the Off-Center Loading
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