Visible, Judge and control of welding parameter.
Model : MM-400A

[ MM-400A ]

Measures current, voltage, welding time, weld force and displacement!

  • Supports a wide range of welding machines
    The instrument supports single-phase AC, DC inverter, AC inverter, transistor, and capacitive discharge welding machines.
  • Various measurement functions
    Easy to use with a touch panel.Display waveforme up to 4 items. Display and judge the parameters of the welding quality determinant up to 10 items.
  • Display screen



  • ISO17657-compliant measurement
    In addition to the arithmetic mean RMS which is a conventional calculation system, the RMS in a whole current flow time which is the ISO17657(Resistance welding -- Welding current measurement for resistance welding -- )-compliant calculation system can be selected. For the ISO17657-compliant measurement, the dedicated ISO-compliant toroidal coil is required.
  • Supports multiple languages

    Languages available are Japanese, English, Chinese, Korean, German, French, and Spanish.


New Features ]

  • Envelope function

    Making the OK/NG judgment by comparing a waveform within an allowable range and a monitored waveform, enables management with waveforms in addition to conventional measured values.
    (Up to 3 points 2 waveforms)



  • Measurement with seam current

    Measures current/voltage in AC welding or voltage in DC welding with a max. 5-minute moving measurement.

  • Measuring displacement Before-Welding

    Measures Before-welding workpiece thickness, judge OK/NG of thickness.


Memory / Comumication / Printing ]

  • Memory

    Measured values and waveforms can be saved in a built-in flash memory device/external USB.

  • Comunication

    RS-232C, RS-485, Ethernet(TCP/IP) Simplex and duplex communication possible.(option)

  • Printing

    Measured data and wavefome can be printing.


Judgment / Control function ]

  • By using a built-in force sensor / displacement sensor, it is possible to measure changes in pressurizing force / displacement amount even during production, display waveforms, judge OK/NG of welding.
  • Weld stop function shifted from 2 outputs to 3 outputs. Fine control of changes in displacement and applied pressure during welding.
  • With external input function, voltage input (± 10 V) current input (4 to 20 mA) from other sensors such as temperature sensor can be measured, waveform display, and OK/NG judge possible.


Configuration diagram ]






  • Accessories


  • mm400a-04-en.jpg

[ MM-400A ]

MODEL MM-400A-00-00/-00-01*1
Measurement Specification Current Range 1×Sensitivity toroidal coil: 0.100~2.000kA/0.30~6.00kA/1.00~20.00kA/3.0~60.0kA/10.0~200.0kA
10×Sensitivity toroidal coil: 0.010~0.200kA/0.03~0.60kA/0.100~2.000kA/0.30~6.00kA/01.00~20.00kA
Shunt Resistor: 25~500A/50~1000A
Item PEAK/RMS*2/Arithmetic mean RMS
Voltade Range 0.30~6.00V/1.0~20.0V
Item PEAK/RMS*2/Arithmetic mean RMS
Force*1 Range 4.90~98.06N(MA-520), 49.0~980.6N(MA-521), 245~4903N(MA-770A)
Item Mean RMS/maximum (peak) Before welding/After welding/Constant
Displacement*1 Range When the SENSOR STEP setting is 1 μm: ±30.000 mm/When the SENSOR STEP setting is 1 0μm: ±300.00 mm
Item Before welding/After welding/Constant
Measurement time Current
AC ms-AC
0.5~250.0CYC(50Hz), 0.5~300.0CYC(60Hz)
0.5~200.0CYC(M050: 50Hz), 0.5~300.0CYC(M063:63Hz), 0.5~2000.0CYC(M500: 500Hz)
0.5~500.0CYC(50Hz), 0.5~600.0CYC(60Hz)
0.5~100.0CYC(50Hz), 0.5~120.0CYC(60Hz)
Force・External 1~10000ms
Seam AC Seam: 5min(Current / Voltage) DC Seam: 5min(Voltage)
Conduction angle 0~180degrees
Units 127schedules
Body Specification Power supply Single-phase 100 to 240 V AC±10% (50/60 Hz) or 24 V DC10%
Languages Japanese, English, Chinese, Korean, German, French, Spanish.
Power consumption 41W(49 W with printer running)
Outer dimensions(W×D×H)(excluding protrusions) 172(W)mm×288(D)mm×266(H)mm
Mass Approx. 5kg
Toroidal coil MB-400M*2/MB-800M*2/MB-45F*3
Shunt Resistor DS 500A/100mV(25~500A) / DS 1000A/100mV(50~1000A)

*1 With displacement / force function is only MM - 400A - 00 - 01.

*2 ISO17657 Compliance

*3 Conversion cable SK-1193305 is required.

* * Specifications subject to change without notice.


Dimensions in mm