MM-400A
8. Operation Screens
8-13
(Note 1) Difference between the original measurement mode and the ISO17657-compliant
measurement mode in RMS calculation
Current mean RMS (original) Current RMS (ISO17657-compliant)
Arithmetic mean RMS current in the measurement
interval
RMS current in all measurement
intervals
4
I4rms
I3rms
I2rms
I1rms
++
+
RMS = Irms
(Note 2) Difference between current flow time of the original measurement mode and that of
the ISO17657-compliant measurement mode (DC measurement only)
a: Current flow time b: Flow time c: Fall level 10 to 90% d: RMS
• Original measurement mode
a: Time till the welding current reaches FALL LEVEL (10 to 90% of peak value)
b: Time till the welding current reaches 10% of peak value
• ISO17657-compliant measurement mode
a: Time till the welding current reaches FALL LEVEL (10 to 90% of RMS)
b: Time till the welding current reaches 10% of RMS
(Note) FALL LEVEL is set in the BASIC SETUP (2) screen.
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