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Hioki insulation testers or megohmmeters feature all-in-one designs including built-in rugged cases and test lead storage compartments. The IR4056 is a 5-range, 50V to 1000V digital insulation resistance tester with efficient functions and features to help shorten work time associated with field insulation testing.

• The comparator function compares measured values to pre-set reference values to generate a pass or fail judgment. (Can be used with insulation resistance measurement and low-resistance measurement.)
• The stable display is easy to read, increasing work efficiency.

Identify PASS/FAIL using light and sound

The IR4056-20 and IR4057-20 notify the operator of pass and fail judgments using a beeping sound, LCD light, and comparator indicator on the test lead with remote control switch (optional accessory), allowing determinations of compliance to be made without looking at the instrument.

IR4056-20 Economic model				IR4057-20 Bar graph for visual judgments Economic model High-speed model
5 ranges 50/125/250/500/1000 V			Rated output voltage (DC)	5 ranges 50/125/250/500/1000 V
			Resistance measurement
Approx. 0.8 s			Comparator judgment result response time	Approx. 0.3 s
			200 mA continuity
-			Bar graph
159W×177H×53D			Dimensions (mm)	159W×177H×53D
600			Mass (g)	640
			Voltage measurement

INSULATION RESISTANT MEASUREMENT
Rated output voltage (DC)	50V	125V	250V	500V	1000V
Effective maximum indicated value	100 MΩ	250 MΩ	500 MΩ	2000 MΩ	4000 MΩ
Effective medium value	2 MΩ	5 MΩ	10 MΩ	50 MΩ	100 MΩ
1st effective measuring range [MΩ]	0.200 to 10.00	0.200 to 25.0	0.200 to 50.0	0.200 to 500	0.200 to 1000
Accuracy	±4 % rdg
2nd effective measuring range [MΩ]	10.1 to 100.0	25.1 to 250	50.1 to 500	501 to 2000	1010 to 4000
Accuracy	±8 % rdg
Other measuring range [MΩ]	0 to 0.199
Accuracy	±2 % rdg. ±6 dgt.
Lower limit resistance value to maintain nominal output voltage	0.05 MΩ	0.125 MΩ	0.25 MΩ	0.5 MΩ	1 MΩ
Overload protection	600 VAC (10 s)				1200 VAC (10 s)
BASIC SPECIFICATION
Indicator	Indicator: Semi-transmissive FSTN LCD, positive Backlight
Functions	Live circuit indicator, Automatic electric discharge, Automatic DC/AC detection, Comparator, Built-in battery power indicator etc.
IR4057-20 Functions	Bar graph, Displaying 1-min. Values
Power source	LR6 alkaline battery × 4
Continuous operating time	Approx. 20 hours (Comparator off, backlight off, 500 V range, no load)
Auto Power Save	The power will go off automatically 10 minutes after the last operation.
Operating temperature and humidity	0 to 40°C (32 to 104°F) 90% RH or lower (non-condensating)
Storage temperature and humidity	-10 to 50°C (14 to 122°F) 90% RH or lower (non-condensating)
Maximum rated voltage to earth	600 V AC/DC, Measurement Category, Anticipated Transient Ωvervoltage: 6000 V
Dielectric strength	7060 V AC, 50/60 Hz, Measurement terminals - electrical enclosure, 1 min, current sensitivity 1 mA
Degree of protection	IP40
Standards	EN61326 (EMC), EN61557-1/ -2/ -4*/ -10
Drop proof	Ωn concrete: 1 m
Dimensions	Approx. 159W×177H×53D mm (6.26"W×6.97"H×2.09"D) (excluding protrusions)
Mass	IR4056-20: Approx. 600g (21.2 oz) IR4057-20: Approx. 640g (22.6 oz) (including battery, excluding test lead)
Accessories	Test Lead L9787 × 1, Neck strap × 1, Instruction manual × 1, LR6 alkaline battery × 4
VOLTAGE MEASUREMENT
DC V
	Display range (Auto range)	4.2 V	42 V	420 V	600 V
	Maximum indicated value	4.200 V	42.00 V	420.0 V	750 V
	Resolution	0.001 V	0.01 V	0.1 V	1 V
	Accuracy	±1.3 % rdg. ±4 dgt. *
AC V
	Display range (Auto range)	420 V (Minimum indicated value: 30.0 V)		600 V
	Maximum indicated value	420.0 V		750 V
	Resolution	0.1 V		1 V
	Accuracy	±2.3 % rdg. ±8 dgt. *
	Measurement Principles	Average responding type
	Frequency range	50/60 Hz
AC/DC automatic detection range	AC detected at 30 V or greater (50/60 Hz) (Pulsating currents with an overlapping AC component of 30 V or greater are detected as AC)
Effect of temperature	Measurement accuracy per 1°C × 0.1 (Applicable to the operating temperature range other than 18 to 28°C)
RESISTANCE MEASUREMENT
Display range (Auto range)	10 Ω			100 Ω	1000 Ω
Maximum indicated value	10.00 W			100.0 W	1000 W
Resolution	0.01 W			0.1 W	1 W
Accuracy (after zero adjustment)	0 to 0.19 W: ±3dgt. 0.20 to 10.00 Ω: ±3%rdg. ±2dgt.			±3%rdg.	±2dgt.
Measuring current	200 mA or more (at 6 Ω or less ) (Display value before zero adjustment)
Overload protection	600 VAC (10s, using Fuse)

Tech Specs

Micro / Milli / Meg Ohmmeters/Megohmmeter / Insulation Resistance Testers Template
IR Test Voltage	1,000 V, 125V, 250 V, 50 V, 500 V
Maximum Insulation Resistance	4 G Ohms
Type	Battery
Minimum Insulation Resistance	0.2 Ohms (0.0000000002 G Ohms)
Variable Incremental Voltage	No
Display (Megohmmeter)	Digital
Continuity Test	Yes
Live Circuit Voltage Detection	No
Power Supply	Battery
Timer	No
CAT Rating	III
CAT Voltage	600 V
Test Equipment General Attributes
Unique Features	Comparator function for easy Pass/Fail judgement Drop Proof to 1M White LED Backlight Integrated hard case with sliding cover
Warranty	2 YEARS
Safety Approval	CE
IP Rating	IP40
Product Weight	600 GRAMS (1.32 LBS)
Product Height	6.97 IN
Product Length	6.26 IN
Product Width	2.09 IN
Data Logging	No
HTS/Schedule B Number	9030333400
ECCN Number	3A992
Calibration Included	None
Battery Type	AA
Power Supply Voltage	Battery Powered
Country of Origin	Japan
Shipping Height	2.25 IN
Shipping Length	7.00 IN
Shipping Width	6.25 IN

Hioki IR4056-20 Product Reviews