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Brand: Hioki
Hioki IR4056-20 Digital Insulation Tester, 5 Voltage Ranges
Description
A drop-proof digital insulation tester with five test voltages
The Hioki IR4056-20 is a digital insulation tester with five test voltage ranges, built for routine electrical maintenance. Hioki gives the rated voltages and effective maximum indicated values as 50 V / 100 MOhm, 125 V / 250 MOhm, 250 V / 500 MOhm, 500 V / 2000 MOhm and 1000 V / 4000 MOhm, so one instrument covers control circuits, low-voltage equipment and 1000 V work. The case is built to withstand a 1 m drop onto a concrete floor, and Hioki lists a 3-year product warranty with accuracy guaranteed for one year.
Several details are aimed at the technician working on live sites. The RELEASE button blinks under the 500 V and 1000 V settings, and has to be pressed to unlock the high-voltage output, which prevents accidental high-voltage generation. A MEASURE key can be pressed for a single test or lifted and locked for continuous testing. Live voltage detection warns with a red light and a continuous tone, a comparator gives a PASS or FAIL decision against a preset value with light and sound, and voltage is measured with automatic AC/DC detection, so the tester also serves as a voltmeter up to 600 V. The IR4056 also has a low-resistance (continuity) function, which the PV-oriented IR4053 lacks.
Technical specifications
| Parameter | Specification |
|---|---|
| Order code | IR4056-20 with test lead L9787; IR4056-21 with test lead set with remote switch L9788-11 (the IR4056-21 is marked in the brochure as not CE marked) |
| Rated test voltage / effective maximum | 50 V / 100 MOhm; 125 V / 250 MOhm; 250 V / 500 MOhm; 500 V / 2000 MOhm; 1000 V / 4000 MOhm (DC) |
| Accuracy, insulation | 1st effective range 0.200 to 10.00 / 25.0 / 50.0 / 500 / 1000 MOhm: +/-2 % rdg +/-2 dgt; 2nd effective range up to 100.0 / 250 / 500 / 2000 / 4000 MOhm: +/-5 % rdg |
| Low resistance | 10.00 / 100.0 / 1000 ohm ranges; +/-3 % rdg +/-2 dgt |
| DC voltage | 4.200 V / 42.00 V / 420.0 V / 600 V; +/-1.3 % rdg +/-4 dgt |
| AC voltage | 420.0 V / 600 V; +/-2.3 % rdg +/-8 dgt (mean rectification, RMS indication) |
| Comparator response time | 0.8 s |
| Safety category | CAT III 600 V |
| Operating / storage temperature | -25 to 65 degC, 90 % RH or less, non-condensing (accuracy guaranteed 23 +/- 5 degC) |
| Dust and water protection | IP40 (terminals excluded); drop proof from 1 m onto concrete |
| Power supply / run time | 4 x LR6 (AA) alkaline or HR6 NiMH batteries; approximately 20 hours continuous |
| Standards | EMC EN 61326; safety EN 61010, EN 61557-1, -2, -4, -10 |
| Dimensions / mass | 159 W x 177 H x 53 D mm; approximately 600 g including batteries |
| Fuse | FF0.5 AH / 1000 V (very fast-blow, high breaking capacity) |
The IR4000 series: how the models differ
Hioki sells the family in several variants: the IR4057-50 adds a high-speed measurement with a 0.3 s comparator response, a digital bar graph and Bluetooth communication with the optional Z3210 wireless adapter for transferring values to Excel or the GENNECT Cross app; the IR4059 is the model for EVs with 50 V to 1000 V ranges; and the IR4053-10 is for photovoltaic systems with PV-ohm measurement up to 1000 V. The IR4056-20 is the straightforward general-purpose model without wireless.
The standard package for the IR4056-20 is the instrument, test lead L9787, a neck strap, four LR6 alkaline batteries and an instruction manual. A carrying case (C0212) is listed as an option. For higher-voltage work, such as cables and motors, Hioki makes the 5000 V IR5050 and IR5051.
What to confirm before ordering
Check the order code: IR4056-20 and IR4056-21 differ in the test lead supplied, and the brochure notes the IR4056-21 as not CE marked, so confirm which lead set and which marking your site requires. Confirm that 1000 V is the highest test voltage in your procedure, and say if you need the remote-switch lead, a carrying case or a wireless adapter (which would point to the IR4057-50). The brochure is a series document; the data above are for the IR4056.
Documents and quotation
The attached Hioki document is the insulation tester series brochure in English. For other insulation testers see the portable test and measurement category, including the Fluke 1507 insulation resistance tester and the Megger MIT1025/2 10 kV tester. Send the order code, accessories and quantity for a quotation from Seven Star LLC.
Datasheets & Documents
- Brochure Hioki Insulation Tester series brochure, English (PDF) Download
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About brand
Hioki E.E. Corporation is a Japanese manufacturer of electrical measuring instruments, founded in 1935 and headquartered in Ueda, Nagano. Seven Star LLC lists Hioki insulation testers, earth testers, clamp meters, power loggers, power quality analyzers and resistance meters, and supplies Hioki instruments to maintenance teams, contractors and utilities in Oman and the GCC.
Hioki instruments listed on this page
- Insulation testers: IR4056-20 (1000 V, five ranges) and IR5050 (5 kV with PI, DAR and DD).
- Earth testers: FT6031-50, FT6041 and the clamp-on FT6380-50.
- Clamp meters: CM4375-50 (1000 A AC/DC) and CM4141-50 (2000 A AC).
- Loggers and analyzers: PW3360-20 clamp-on power logger and PQ3198 Class A power quality analyzer.
- Resistance meters: RM3548-50 handheld four-wire meter.
Ordering Hioki instruments: what we need
Send the full order code, because Hioki uses suffixes to separate versions, for example sets with wireless adapters or different leads. Name the accessories you need, such as test leads, clamps, current sensors, the Z3210 wireless adapter and carrying cases, and say if a calibration certificate is required. If the model is uncertain, describe the circuit, the voltage and the quantity to be measured.
Browse Hioki products by category: Portable Test & Measurement.
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Frequently Asked Questions
Which test voltages does the IR4056-20 offer?
50, 125, 250, 500 and 1000 V DC, with effective maximum indicated values from 100 MOhm to 4000 MOhm.
Can it measure continuity?
Yes. It has a low-resistance measurement function with 10, 100 and 1000 ohm ranges.
How tough is the housing?
Hioki lists drop proof from 1 m onto concrete and IP40 protection, excluding the terminals.
What safety category does it have?
CAT III 600 V.
What is the difference between IR4056-20 and IR4056-21?
The IR4056-21 comes with the test lead set with remote switch L9788-11; the brochure notes it as not CE marked and lists low resistance measurement as excluded for the IR4056-21.
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