Yokogawa MY4001
Digital Insulation Tester

Includes Carrying Case (93015)
Insulation resistance: AC voltage and conductor resistance measurement
Insulation test mode: Comparator, memory, auto-hold and discharge function
All test modes: Live-line alarm (Exchange AC voltage measurement)
Easy to view, function-free display
Double-action safety mechanism

Yokogawa MY40-01 Shown

Product Information
Datasheet	163 KB
Manual	343 MB
Ordering Info
PDF Help

4 ratings, Digital type Rating: 125V/200Megohm, 250V/200Megohm, 500V/2000Megohm, 1000V/2000Megohm Features: Automatic discharge function, Live-line alarm, Comparator, Internal memory, AC Voltage measurement

Display:
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.

Over range 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.

Dimensions:
125(W)x103(H)x53(D)mm, excluding protrusions

Weight:
420 g (main unit and batteries only, excluding accessories)

Rating	Range Option	Resolution	Measuring Range	Tolerance	Lower Limit of measured Ω	Rated Current	Central Scale Value
125V/200MΩ	.4000 4.000 40.00 200.0	.1kΩ 1 kΩ 10kΩ 100kΩ	0-.0199MΩ .0200-10.00MΩ 10.01-200.0MΩ	±(5% 0f rdg+6dgt) ±(2% of rdg+6dgt) ±5% of rdg	0.125MΩ	1mA	5MΩ
250V/200MΩ	.4000 4.000 40.00 200.0	.1kΩ 1 kΩ 10kΩ 100kΩ	0-.0499MΩ .0500-20.00MΩ 20.01-200.0	±(5% 0f rdg+6dgt) ±(2% of rdg+6dgt) ±5% of rdg	0.25MΩ	1mA	5MΩ
500V/2000MΩ	4.000 40.00 400.0 2000	1 kΩ 10kΩ 100kΩ 1 MΩ	0-0.999MΩ 1.000-500MΩ 501-2000MΩ	±(5% 0f rdg+6dgt) ±(2% of rdg+6dgt) ±5% of rdg	0.5MΩ	1mA	50MΩ
100V/2000MΩ	4.000 40.00 400.0 2000	1 kΩ 10kΩ 100kΩ 1 MΩ	0-1.999MΩ 2.000-1000MΩ 1001-2000MΩ	±(5% 0f rdg+6dgt) ±(2% of rdg+6dgt) ±5% of rdg	2MΩ	0.5mA	50MΩ

Ordering Information
Model	Description	Buy Online	Price
MY4001	Yokogawa MY40-01 Digital 250V/250 Megohm 500V/2000 Megohm 1000V/2000 Megohm w/case		$625.00
Included Accessories
	1 - Protective cover 1 - Shoulder strap 1 - Line Probes 1 - Earth probes 1 - User's Manual 4 - Batteries	Included
Optional Accessories
Model	Description	Buy Online	Price
Carrying Cases and Holders
B9108XA	Yokogawa B9108XA Accessory Carrying Case		$9.00
99005	Yokogawa 99005 My-shoulder strap		$10.00
Probes, Probe Tips, and Test Leads
98001	Yokogawa 98001 My-Line Probe		$19.00
98002	Yokogawa 98002 My-Earth Probe		$19.00

Yokogawa MY4001 Digital Insulation Tester

Yokogawa MY4001
Digital Insulation Tester