About this calibration system
What is calibration?
099-008060-EW501
19.02.2013
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About this calibration system
4.1
What is calibration?
In measuring technology, calibration means:
Determination of measurement errors on the finished measuring instrument. For measuring instruments
with displays, the measurement error between the display and the value which is correct or regarded as
correct is determined by calibration. There is no technical intervention in the measuring instrument.
4.2
What is validation?
With transmitting machines, the measurement error between the value of the output signal and the set
nominal value which the signal would show under ideal transmission conditions and at a given input value
is determined by validation. There is no technical intervention in the machine.
4.3
What is adjustment (matching)?
In measuring technology, adjustment means:
Setting up (matching) a measuring instrument so that the measurement errors are as small as possible,
or the size of the measurement errors do not exceed the margins of error.
4.4
Why calibrate?
Optimum reproducibility of welding processes and parameters.
Inaccurate display instruments affect the quality of welding results.
To maintain a certain delivery quality, generally for particular requirements such as e.g. pressure tanks,
equipment, pipelines etc.
4.5
Calibrate how often?
An annual check of the displays in 1-shift operation is sufficient.
In 2-shift operation we recommend a half yearly check.
If welding machines are involved in development work, process trials etc. a correspondingly shorter
period is recommended.
4.6
Calibration certificate
After calibration, each machine is provided with a test plate showing the next checking date.
You are issued with a test log and a calibration certificate as documentation.
4.7
Calibration device (KLE)
The calibration device serves the purpose of calibrating arc welding machines.
The following measured values can be indicated with the calibration device:
Primary (on the power side)
Measurement data indication with one ammeter each for three mains currents and a voltmeter with
changeover switch for three phases.
Secondary (power source output quantity)
Measurement data indication using digital ammeter for the welding current, digital voltmeter for the
voltage.
General
Measurement data indication, digital instrument for ambient temperature
4.8
Load simulation unit (LS 600 A)
The load simulation unit simulates the arc so that welding machines can be calibrated and tested without
the arc.
Welding currents of up to 600A (10% DC) can be simulated with this system.
The load voltage can be matched to the various welding processes (MIG/MAG, TIG and MMA).
