MM-400A
8. Operation Screens
8-141
When the TIME setting is changed, START MEASUREMENT,
MEASUREMENT RANGE, MEASUREMENT INTERVAL, START TIME, and
END TIME may be initialized. Set START MEASUREMENT, MEASUREMENT
RANGE, MEASUREMENT INTERVAL, START TIME, and END TIME again.
(Refer to "s-1. SEAM SETUP (1) Screen.")
(3) CALCULATION
Select the calculation system.
RMS: Calculated the RMS in the whole measurement range.
AVERAGE RMS: Calculates the RMS every half cycle or 1 ms and calculates
the arithmetic mean value within the measurement range.
Refer to (Note 1) Difference between the original measurement mode and the
ISO17657-compliant measurement mode for RMS calculation in “c. VIEW
Screen.”
(4) CURRENT RANGE
Select from the following five ranges. Select one which is larger than the
maximum current of welding current actually measured and close to the
measured current.
The current ranges change as follows depending on the TOROIDAL COIL
setting in the BASIC SETUP (3) screen
• When the TOROIDAL COIL setting is 1: 2.000 kA range, 6.00 kA range,
20.00 kA range, 60.0 kA range, 200.0 kA range
• When the TOROIDAL COIL setting is 10: 0.200 kA range, 0.600 kA range,
2.000 kA range, 6.00 kA range, 20.00 kA range
(5) VOLTAGE RANGE
Select from the following two ranges. Select one which is larger than the
maximum voltage of welding current actually measured and close to the
measured voltage.
6.00 V: 6.00 V range
20.0 V: 20.0 V range
(6) CURRENT TRIGGER LEVEL
The sensitivity increases as you increase the value. Excessively increasing the
sensitivity may cause malfunction. If set to around 99, the current trigger may
not be complete. At the time, decrease the value.
(7) TOROIDAL COIL
Set as follows depending on the type of toroidal coil connected:
When 1x sensitivity coil is used: 1
When 10x sensitivity coil is used: 10
(8) END LEVEL
You can measure the current flow time till the End Level setting is reached. Set
the End Level as the ratio to the used current range (1.5 to 15.0%).
(9) Function keys
MENU: Touching this displays the MENU screen.
PREV: Touching this displays the SEAM SETUP (2) screen.
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