MM-400A
8. Operation Screens
8-69
• When measuring force/external (external sensor measurement) according to
the current measurement start:
Select AUTO for TRIGGER.
* Set the trigger level of force/external to the maximum value.
• When measuring an external (external sensor measurement):
Select EXTERNAL (EXT) or EXTERNAL for TRIGGER.
* The same setting is applied when measuring current/displacement.
* When the trigger level setting is difficult because difference between the times
when measurement is performed and when not performed is small, it is
recommended to use the external input trigger.
(4) TIME
To measure a current accurately, be sure to select “-DC” for DC measurement
and “-AC” for AC measurement.
When the TIME setting is changed, upper and lower limits for measurement
items WELD TIME and FLOW TIME and TIME, START TIME, END TIME,
COOL TIME, and MEASUREMENT MIN TIME on the BASIC SETUP screens
may be initialized. Set upper and lower limits and TIME, START TIME, END
TIME, COOL TIME, and MEASUREMENT MIN TIME on the BASIC SETUP
screens again. (Refer to "e. COMPARATOR Screen" and "l-2. BASIC SETUP
(2) Screen.")
When the TRIGGER setting is changed, TIME may be initialized. Set TIME
again.
• CYC-AC
Select this option to measure single-phase AC welding current.
Frequency: Automatically detected from the MM-400A’s power supply
Measurable time: 5,000 ms max. (50 Hz: 250 CYC, 60 Hz: 300 CYC)
• ms-DC
Select this option to measure DC output inverter welding current in units of
ms.
Measurable time: 2,000 ms max.
• CYC***Hz-AC
Select this option to measure AC output inverter welding current in units of
cycle. Set the frequency of the current you wish to pass in FREQUENCY in
the BASIC SETUP (1) screen.
Measurable time: 4,000 ms max. (M050 (50 Hz): 200 CYC, M063 (63 Hz):
50 CYC, ... M500 (500 Hz): 2000 CYC)
• CYC-DC
Select this option to measure DC output inverter welding current in units of
cycle.
Frequency: Automatically detected from the MM-400A’s power supply
Measurable time: 2,000 ms max. (50 Hz: 100 CYC, 60 Hz: 120 CYC)
• ms-AC
Select this option to measure AC output inverter welding current in units of
ms.
Measurable time is 5,000 ms max.
• SHORT ms-DC
Select this option to measure transistor welding current. The current flow
time is 1 ms when ms-DC is selected. In contrast, the current flow time is
every 0.05 ms when SHORT ms-DC is selected, thus allowing measurement
at more frequent intervals.
When you have selected SHORT ms-DC, you cannot measure force and
external input (±10 V voltage or 4 to 20 mA current).
To measure the current flow time every 0.05 ms, you need to set CURRENT
SAMPLING INTERVAL to 50us. For the CURRENT SAMPLING INTERVAL
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