Yokogawa MY40-01 Data sheet
MY40 Digital Insulation Tester
쎲 Digital model with 4 voltage/resistance ratings
쎲 Multifunction
Insulation resistance, AC voltage and conductor resistance measurement
Insulation test mode: Comparator, memory, auto-hold and
All test modes: Live-line alarm (excluding AC voltage
쎲 Easy-to-view, fluctuation-free display
쎲 Double-action safety mechanism
Testing Performance Specifications
Model Rating
125V/200MΩ
250V/200MΩ
MY40
-01
500V/2000MΩ
1000V/2000MΩ
Range
Option
.4000
4.000
40.00
200.0
.4000
4.000
40.00
200.0
4.000
40.00
400.0
2000
4.000
40.00
400.0
2000
Measuring Range Tolerance
Resolution
.1kΩ
1kΩ
10kΩ
0–.0199MΩ
.0200–10.00MΩ
10.01–200.0MΩ
100kΩ
.1kΩ
1kΩ
10kΩ
0–.0499MΩ
.0500–20.00MΩ
20.01–200.0MΩ
100kΩ
1kΩ
10kΩ
100kΩ
0–0.999MΩ
1.000–500MΩ
501–2000MΩ
1MΩ
1kΩ
10kΩ
100kΩ
0–1.999MΩ
2.000–1000MΩ
1001–2000MΩ
1MΩ
± (5%of rdg+6dgt)
*
± (2%of rdg+6dgt)
± 5%of rdg
± (5%of rdg+6dgt)
*
± (2%of rdg+6dgt)
± 5%of rdg
± (5%of rdg+6dgt)
*
± (2%of rdg+6dgt)
± 5%of rdg
± (5%of rdg+6dgt)
*
± (2%of rdg+6dgt)
± 5%of rdg
Lower Limit of
measured Ω
0.125MΩ
0.25MΩ
0.5MΩ
2MΩ
Current
0.5mA
* First effective measuring range; ** The minimum value at which the rated voltage can be maintained
Rated
1mA
1mA
1mA
Central Scale
Standard test conditions
Ambient temperature/humidity ranges: 23 ±5:/45-75% RH
Value
Tolerances under the above-mentioned conditions:
5MΩ
Deviation from zero scale value: 6 digits maximum
Indication of ∞ mark on bar graph: Approx. 4000 MΩ min. (500 V/1000 V)
Open circuit voltage: 130% max. of rated voltage
5MΩ
Rated measuring current:
Short-circuit Current: 2 mA max.
50MΩ
AC voltage measurement (45-400 Hz)
MY40-01 600V 1V ±(2% of rdg + 6dgt) Approx. 2 MΩ
50MΩ
Conductor resistance measurement
MY40-01 400Ω 0.1Ω ±(2% of rdg + 8dgt)
SERIES
discharge functions
measurement), battery check and automatic power-off
Protection against inadvertent setting of rotary
switch to 1000 V rating
Approx. 400 MΩ min. (125 V/250 V)
1 mA (0 to 20%) when in first effective measuring range
Model Range
Model Range
Resolution
Resolution
Accuracy Input Impedance
Accuracy
Open-circuit Voltage
Buzzer sound
resistance: <40Ω.
General Specifications
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.
Example of Extension Bar Indicator View
The data value is
changing.
The data value is fixed.
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.
Dimensions: 125 (W) ҂ 103 (H) ҂ 53 (D) (mm), excluding protrusions
Weight: 420 g (main unit and batteries only, excluding accessories)
Batteries: Four AA (R6P) batteries
Note: See the list of accessories on the backside of this bulletin for more information on
accessories.
Standard Accessories
Product Part Number Qty
Protection cover
Shoulder strap
Line probe
Earth probe
User's manual
Batteries
93013
99005
98001
98002
–
–
1
1
1
1
1
4
External Dimensions Unit: mm
52.5
103
93015
Carrying case
(case for housing both the main
unit and accessories)
93013
Protection cover
LIGHT
Enter
INSULATION
TESTER
MEM
MEAS
PULL
LOCK
COMP
Select
125
ALARM
1000V
2000MΩ
500V
250V
200MΩ
125V
V
600V MAX
OFF
1000V RELEASE
Clr
B9108XA
Accessory-housing case
3
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