ISO 17657-5:2005 pdf download.Resistance welding -Welding current measurement for resistance welding 一Part 5: verification of welding current measuring system.
The specification, name of certifying body and relevant date for the master welding current meter, and master current sensing coil shall be recorded on all documents, see in Annex A.
6.2 Master (current sensing) coil
The sensor position error of master current sensing cod should be within 0.5 %, or the sensorlcoil position should be set at the same position in which it was calibrated If the master coil requires a fixed position to guarantee the accuracy, the calibrated position shah be marked on the master coil.
NOTE The master cod should be set at the same position as the one at tiich it was calibrated. Position B as illustrated in Figure 1 is recommended as the setting position of master coil in aider to keep the accuracy of master cod after multi-repeat setting and detaching
6.3 Welding machine used for verification
Resistance spot, proecUon and seam welding machines as defined in Iso 669 can be used as the power sources, and should be capable of delivering a current within the range of the test welding current measuring system.
7 Test report
The following shall be recorded during verification of a welding current measuring system including monitoring devices for measuring welding current:
a) model and type of master welding current meter and current sensing coil, the full scale or the measuring range and the measuring accuracy;
b) sensor position of master coil to guarantee the measuring accuracy;
C) model and type of test welding current meter and the rated class;
d) measuring range of the test meter to be tested
e) setting positions of meter and test coils (see Figure 1 of ISO 17657.2:2005);
t) type and frequency of power source used for the test (alternating current 50 Hz or 60 Hz, direct current).
9) time of current application;
h) room temperature;
also each measurement:
i) read.out of the master welding current meter expressed as an rm.s. value, in kiloamps (kA).:
6.2 Master (current sensing) coil
The sensor position error of master current sensing cod should be within 0.5 %, or the sensorlcoil position should be set at the same position in which it was calibrated If the master coil requires a fixed position to guarantee the accuracy, the calibrated position shah be marked on the master coil.
NOTE The master cod should be set at the same position as the one at tiich it was calibrated. Position B as illustrated in Figure 1 is recommended as the setting position of master coil in aider to keep the accuracy of master cod after multi-repeat setting and detaching
6.3 Welding machine used for verification
Resistance spot, proecUon and seam welding machines as defined in Iso 669 can be used as the power sources, and should be capable of delivering a current within the range of the test welding current measuring system.
7 Test report
The following shall be recorded during verification of a welding current measuring system including monitoring devices for measuring welding current:
a) model and type of master welding current meter and current sensing coil, the full scale or the measuring range and the measuring accuracy;
b) sensor position of master coil to guarantee the measuring accuracy;
C) model and type of test welding current meter and the rated class;
d) measuring range of the test meter to be tested
e) setting positions of meter and test coils (see Figure 1 of ISO 17657.2:2005);
t) type and frequency of power source used for the test (alternating current 50 Hz or 60 Hz, direct current).
9) time of current application;
h) room temperature;
also each measurement:
i) read.out of the master welding current meter expressed as an rm.s. value, in kiloamps (kA).:
