NBN EN ISO 17657-4 : 2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Construction of calibration system
  4.1 Reference welding current measuring system
  4.2 Test set-up
  4.3 Basic feature for calibration of welding current
      measuring system
  4.4 Basic feature for calibration of current sensor
  4.5 Basic feature for calibration of welding current
      meter without sensor
5 Physical environment and operating conditions
6 Calibration requirements
  6.1 Reference welding current measuring system
  6.2 Reference current sensor
  6.3 Data acquisition device
  6.4 Test stage and power sources
7 Test report
  7.1 Test report for calibration of welding current
      measuring systems
  7.2 Test report for calibration of current sensors
  7.3 Test report for calibration of welding current
      meters without sensors
8 Test procedure
  8.1 General
  8.2 Calibration of welding current measuring system
  8.3 Calibration of current sensor
  8.4 Calibration of welding current meter without sensor
  8.5 Special calibration cases
Annex A (informative) Measuring set-up
Annex B (informative) Items to be recorded or filed as
        reference documentation for calibration
Annex C (informative) Examples of the test report in
        accordance with this part of ISO 17657

Specifies calibration systems and calibration procedures for welding current measuring systems, current sensors, welding current meters and monitoring devices with current sensor used for measuring welding current in resistance welding with alternating current of 50 Hz or 60 Hz, or with direct current.