Calibration And Validation; Measurement Methods And Tolerances; Requirements, Specifications And Standards - ESAB ROBUSTFEED EDGE Instruction Manual

12 CALIBRATION AND VALIDATION
12

CALIBRATION AND VALIDATION

WARNING!
Calibration and validation should be performed by a trained service technician with sufficient
training in welding and measurement technology. The technician should have knowledge of
hazards that may occur during welding and measurement and should take necessary
protective actions!
12.1

Measurement methods and tolerances

When calibrating and validating, the reference measuring instrument must use the same measuring
method in the DC range (averaging and rectification of the measured values). A number of
measurement methods are used for reference instruments, e.g. TRMS (True Root Mean Square),
RMS (Root-Mean-Square) and rectified arithmetic mean. Warrior Edge 500 uses the rectified
arithmetic mean value and should therefore be calibrated against a reference instrument using the
rectified arithmetic mean value.
In the field application it will occur that a measuring device and a Warrior Edge 500 may display
different values even though both systems are validated and calibrated. This is due to the
measurement tolerances and the method of measurement of the two measurement systems. This can
result in a total deviation up to the sum of both measurement tolerances. If the measurement method
differ (TRMS, RMS or rectified arithmetic mean), significantly larger deviations are to be expected!
The ESAB Warrior Edge 500 welding power source presents the measured value in rectified arithmetic
mean and should therefore not show any significant differences compared to other ESAB welding
equipment, due to the measurement method.
12.2

Requirements, specifications and standards

Warrior Edge 500 is designed to meet the accuracy for indication and meters required by IEC/EN
60974-14, by definition Standard grade.
Calibration accuracies of displayed value
Arc voltage ±1.5 V (Umin–U2) under load, resolution 0.25 V (Theoretical measuring range in a
Warrior Edge 500 system is 0.25–199 V.)
Welding current ±2.5% of I2 max according to rating plate of the unit under test, resolution 1 A. The
measuring range is specified by the rating plate on the used Warrior Edge 500
welding power source.
Recommended method and applicable standard
ESAB recommend calibration and validation to be executed according to IEC/EN 60974-14 (unless
another way of execution is communicated from ESAB).
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