MM-400A
8. Operation Screens
8-82
(7) MEASUREMENT MIN TIME
In the early steps of current flow, the instrument may fail to measure the
current if the current is excessively low. (This likely occurs if the upslope is
used.) In such a case, set a forced measurement time. Set a forced
measurement time in the following ranges.
When the TRIGGER and TIME settings are changed, MEASUREMENT MIN
TIME may be initialized. Set MEASUREMENT MIN TIME again. (Refer to "l-1.
BASIC SETUP (1) Screen.")
• When CYC-AC, CYC-DC, LONG CYC-AC or CYC***Hz-AC is selected for
TIME: 00.5 to 50.0 CYC
• When ms-DC or ms-AC is selected for TIME: 0001 to 1,000 ms
• When SHORT ms-DC is selected for TIME: 000.1 to 100.0 ms
Set a time so that currents of measurable magnitude (shaded areas in the
figure) are included.
(8) MEAS INHIBIT TIME
Set a measurement prohibition time (0.0 to 10.0 sec). Select SET PULSE for
PULSE MODE, and “00” for PULSE No.
By setting a measurement prohibition time, a non-measurement time following
a measurement is provided not to measure a reset current following a welding
current flow peculiar to a capacitor-type welding machine.
(9) END LEVEL
You can measure the current flow time till the Current End Level setting is
reached. Set the Current End Level as the ratio to the used current range (1.5
to 15.0%).
Refer to (Note 1) Difference between the original measurement mode and the
ISO17657-compliant measurement mode for RMS calculation in “c. VIEW
Screen.”
(10) PULSE 2 TRIG LEVEL
When you have selected NO COOL for PULSE MODE, this can be set. The
instrument starts measurement determining the point in time where the start
current is exceeded as the measurement start point. Measurement is possible
only if the current at the second step is larger than that at the first step.
Current
FALL LEVEL
Current flow time
(Time till it falls below FALL LEVEL)
Current
Forced measurement time
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