MM-400A
8. Operation Screens
8-81
For DELAY TIME of EXTERNAL, refer to Chapter 8, “m-6. EXTEND SETUP
(6) Screen.”
(4) PULSE No.
For a standard single pulse, set “00” for PULSE No.
When SET PULSE is selected for PULSE MODE, set the number of current
flow times to measure. When ALL PULSE (SET) is selected, set the number of
current flow times in a single welding sequence. When ALL PULSE (NO SET)
is selected, any setting is good since PULSE No. is not used.
When NO COOL is selected for PULSE MODE, set a measurement start
timing current for PULSE 2 TRIG LEVEL. For PULSE 2 TRIG LEVEL, set a
value within the specified measurement range.
When LONG CYC-AC is selected for TIME, no impulse measurement is
performed. To operate, select SET PULSE for PULSE MODE, and “00” for
PULSE No.
For TIME, refer to Chapter 8, “l-1. BASIC SETUP (1) Screen.”
(5) COOL TIME
If, during current measurement, the COOL TIME (time that current does not
flow) is shorter than the value specified here, the instrument makes
measurement determining the current to be a single current flow. Set the
COOL TIME in the following ranges.
When the TRIGGER and TIME settings are changed, COOL TIME may be
initialized. Set COOL 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: 000.5 to 100.0 CYC
• When ms-DC or ms-AC is selected for TIME: 1 to 2,000 ms
• When SHORT ms-DC is selected for TIME: 000.1 to 200.0 ms
When measuring as a single current flow, set COOL TIME of MM-400A
longer than the cooling time of the welding power supply.
When measuring as another current flow, set COOL TIME of MM-400A
shorter than the cooling time of the welding power supply. (Use the initial
setting of 0.5 CYC or 1 ms).
(6) FALL LEVEL
When ms-DC, CYC-DC or SHORT ms-DC is selected for TIME, you can
measure the current flow time till the FALL LEVEL setting is reached. Set the
FALL LEVEL as the ratio to the peak (10 to 90%).
Refer to (Note 1) Difference between the original measurement mode and the
ISO17657-compliant measurement mode for RMS calculation in “c. VIEW
Screen.”
Measured as one
current flow
Current
COOL TIME: 5ms
When COOL TIME is 5ms
Measured as another
current flow since
COOL TIME is over 5ms
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