• Weld tester (handheld type): MM-380A.MM-315B

Weld tester (handheld type): MM-380A.MM-315B

"Visually" control for better weld quality.
Model : MM-380A MM-315B

[ MM-380A ]
Possible to measure current, voltage, welding time, weld force, and displacement value at your hand.

  • Supports various types of welders.

    Supports single-phase AC welders, DC inverter welders, AC inverter welders, and transistor type welders.

  • Simple operation with a dial

    Turn the dial to scroll the screen, move the cursor, and select items. Press the dial to select the item where the cursor is located.

  • Clear display of the current and voltage

    320x240 dots/4.7-inch color LCD screen.

  • Various display capability

    Displays various welding waveforms without using an oscilloscope.

  • Waveform re-display feature (FIT feature)

    The displayed waveform can be shifted and zoomed in and out in the screen. Even if the waveform of where you would like to observe went off the screen, it can be back to display the waveform again. (Pat. Pend)

  • Supports multiple languages

    You can select the language from Japanese, English, Chinese, Korean, German, French, and Spanish.

  • Recording and transferring of data
    • The measured values and waveforms can be saved in a memory or transferred out to PC for analysis.
    • Data transfer can be done in the RS-232C to PC.
    • Data can be printed out by the local printer equipped with the device.
  • OptionsDisplay screen
    • The applied force and weld current can be measured simultaneously while welding (Optional weld-and-force sensor, MA-770A or MA-771A is necessary).
    • Voltage signal (Max.±10V) from other sensor can also be measured due to the external input facility.

  • Accessories


  • mm-380a-2-en.png

  • mm-380a-3-en.png

[ MM-315B ]
Highly functional handheld type weld monitor (checker) for various weld current waveforms.

  • Low-price, multi-functional, ultra-compact welding current measuring unit.
  • The welding current and the weld time can be configured.
  • The conduction angle can be set.
  • Large clear LCD.
  • Non-volatile memory employed in MM-315A would hold the configuration even on flat battery.
  • The panel sheet resists dust and oil mist.

[ MM-380A ]

Model MM-380A
Current Measuring range (1)0.1 - 2.000kA (2)0.3 - 6.00kA (3)1 - 20.00kA
(4)3 - 60.0kA (5)10 - 200.0kA (5 ranges)
Measured value Arithmetic mean effective value, maximum value (peak value)
Measurement accuracy For range (1)(3)(5) ± (1%rdg+9 - 20dgt)
For range(2)(4) ± (1%rdg +3 - 7dgt)
Voltage Measuring range 2 ranges, 6.00 V or 20.00 V
Measured value Arithmetic mean effective value, maximum value (peak value)
Measurement accuracy ±(1%rdg+3dgt)
Welding time Measuring range AC mode DC mode
50Hz:0.5 - 500.0CYC/60Hz:0.5 - 600.0CYC 1 - 2000ms
Force Measuring range 4.90 - 98.06N(MA-520A), 49.0 - 980.6N(MA-521A), 490 - 9806N(MA-522A)
245 - 4903N(MA-770A), 490 - 9806N(MA-771A)
Measured value Average value/maximum value (peak value)
Measurement accuracy ± (Load cells full scale error +2%rdg+29dgt)
Conduction angle measurement 0 - 180 degree (CYC mode only)
Number of schedules 127 schedules
Printer Printable items: Measurement data, waveforms, all cycles, setting condition data, screen copies, print history
Power requirements 9VDC (AC adaptor is single-phase 100 - 240VAC ±10% 50/60Hz)
Power consumption 22W
Mass Approx. 900g

The specification and external design are subject to change without notice.

[ MM-315B ]

Model name MM-315A
Current Measuring range 1.00 - 9.99kA (Lo range) 5.0 - 49.9kA (Hi range) *
Measured value Arithmetic mean effective value of measurement range
Measurement accuracy ±2% of full scale
Time Measuring range AC DC
1-99 cycles 1 - 40 cycles / 0.01-0.80 second
Start 1 - 99 cycles
Exit up to 2% of full scale 75% or less of previous cycle
Conduction angle measurement Maximum power angle in 30 - 180°measurement segment ±5% of full scale
Multi-step welding 9 steps (With memory function)
Power supply With four 1.2V nickel-cadmium batteries (4.8 V), can be used for 10 consecutive hours.
Dimensions (mm) 75(W) x 30(D) x 170(H)
Mass 500 grams (including four NiCd batteries.)
  • * When detected by MB-500-15
  • MM-380A


  • MM-315B