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3.3. Performing a Calibration

The measurement of weight and force using the Load Cell Input Unit always requires

calibration to be performed before measurement. There are two calibration methods for the

Load Cell Input Unit:

・Actual load calibration

・Equivalent input calibration

This section describes the overview of each calibration and its procedure.

3.3.1. Overview of Calibration

The Load Cell Input Unit can properly convert the input into weight values and load values

according to the load on the load cell when a calibration is performed. For example, when a

load of 10 kg is applied to the load cell, perform a calibration in order for the Load Cell Input

Unit to convert the measurement value to 10 kg. The overview of each calibration method is

described below.

・ Overview of Actual Load Calibration

This is a calibration method that applies an actual load to the load cell that is connected to

the Load Cell Input Unit, and registers the actual load value on the Load Cell Input Unit as

calibration data. Because the margin of error is small during calibration, highly accurate

measurement is achieved. For high precision measurement, the actual load calibration is

recommended.

・ Overview of Equivalent Input Calibration

This is a calibration method that sets the rated capacity, the rated output and the zero

balance that are listed on the data sheet for the load cell by entering numeric values, and

registers the values on the Load Cell Input Unit as calibration data.

Compared to an actual load calibration, the measurement resolution is lower because the

margin of error is greater with this calibration. An equivalent input calibration is performed in

the following cases:

• When measuring a force

• When measuring a material of a weight for which preparation of a standard weight is not

possible

• When spatial limitation makes it difficult to apply an actual load, such as when the load cell

and the filing machine are integrated.

*1. The force applied to the load cell is measured. The unit is N or kN.

・ How to Perform Calibration

Two calibration methods can be used for the Load Cell Input Unit:

・By using the Sysmac Studio

・By using the I/O data

This Guide describes the method using the Sysmac Studio. For the method using the I/O

data, refer to 6-2 Specifications of I/O Data and 7-4 Calibration with the User Program

described in the NX-series Load Cell Input Unit User’s Manual (Cat. No. W565).

Omron SYSMAC NX series Startup Guide

Other manuals for Omron SYSMAC NX series