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 All Categories    MY40 Digital Insulation Tester - Yokogawa
Weschler Instruments is a manufacturer and distributor of electrical and electronic measurement equipment. Customers worldwide use our products in power plants, steel mills, chemical plants, paper mills and other industrial applications that require rugged, reliable and accurate instrumentation.
All Categories > Test Equipment > Yokogawa Insulation Testers > MY40 Digital Insulation Tester - Yokogawa > Item # MY40-01  
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Item # MY40-01, MY40 Digital Insulation Tester - Yokogawa

  • Digital model with 4 voltage/resistance ratings
  • Multifunction
    Insulation resistance, AC voltage and conductor resistance measurement
    Insulation test mode: Comparator, memory, auto-hold and discharge functions
    All test modes: Live-line alarm (excluding AC voltage measurement), battery check and automatic power-off
  • Easy-to-view, fluctuation-free display
  • Double-action safety mechanism
  • Weight including main unit and batteries only, excluding accessories

MY40 Digital Insulation Tester

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External Dimensions

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 Specifications  Tolerance Mentioned Conditions  Testing Performance  


125 mm


103 mm


53 mm


3 1/2-digit LCD; 4000 count; backlight-illuminated; logarithmic bar graph; extension bar graph-no fluctuations, as the display shows the digits of a reading in the order in which each digit settles.

Comparator Function

The MY40 alerts you by turning on the LOW symbol and sounding the buzzer if the measured value is smaller than the reference value. You can allocate as many as three user-defined reference values to each rating. The factory-set defaults are 0.1 MΩ, 0.2 MΩ and 0.4 MΩ.

Memory Function

For each rating, you can save as many as 20 measurements at desired memory address numbers.

Automatic Discharge Function

The MY40 automatically begins discharge when you turn off the MEAS switch. You can monitor the state of discharge by checking the bar graph and make sure discharge is complete by checking that the segment bar disappear.

High-Voltage Indicators

The high-voltage symbol and LED lamp come on to alert you when the MY40 is in insulation testing mode or if any voltage remains to be discharged.

Live-Line Alarm

If you apply an AC voltage of approximately 40 V or higher across the input terminals, the MY40 alerts you by blinking the LED lamp and sounding the buzzer.

Overrange Input Alarm

If the voltage being measured exceeds 600 V during AC voltage measurement, the MY40 alerts you by flashing the Maximum Value indicator and sounding the buzzer.

Auto-Hold Function

The tester retains the measured resistance for approximately 5 seconds after the MEAS switch is turned off.


Four AA (R6P) batteries


420 g

Ambient Temperature/Humidity Ranges

23 ±5 /45-75% RH

Standard Accessories

Batteries (Qty - 4)
Earth Probe (98002) (Qty - 1)
Line Probe (98001) (Qty - 1)
Protection Cover (93013) (Qty - 1)
Shoulder Strap (99005) (Qty - 1)
User's manual (Qty - 1)


 width= Product Manual
(PDF, 203KB)

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(PDF, 77KB)

 width= insulation-tester-glossary
(PDF, 34KB)

 width= MY40-Users-Manual
(PDF, 370KB)

 width= Fluke Infrared Thermometers Catalog Page
(PDF, 234KB)

 MY40 Accessories 


MY40 Insulation Testers Accessories

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