Name: Hioki ST5520 Insulation Tester | MME UAE
Brand: Hioki
SKU: 6968

Hioki ST5520 Insulation Tester

Brand: Hioki

SKU: 6968

Ensure electrical safety with the Hioki ST5520, known for its high accuracy in insulation testing.

Description

Overview

The Hioki ST5520 Insulation Tester is a bench-type instrument designed to verify the insulation resistance of electrical devices and components on the production line. With a fully adjustable DC test voltage from 25 V to 1000 V in 1 V steps, it can be tailored precisely to the device under test and the applicable safety standard.

Built for high-throughput manufacturing, the ST5520 delivers pass/fail assessments in as little as 50 ms and includes a quick residual-voltage discharge feature and a contact-check function for safe, reliable and repeatable testing.

Key Features

Adjustable DC test voltage from 25 V to 1000 V in 1 V increments
High-speed pass/fail assessment in as little as 50 ms
Quick discharge of residual voltage for operator and device safety
Contact-check function to confirm proper contact before testing
Upper-Fail / Pass / Lower-Fail comparator judgment settings
RS-232C and external I/O interfaces for automated system integration

Applications

Insulation-resistance testing of electrical devices and components
Production-line safety testing
Automated inspection systems
Quality control in electronics manufacturing

What’s in the Box

ST5520 Insulation Tester main unit
Power cord
Instruction manual
Standard accessories

Why buy from MME in UAE

MOHAMMAD MAHDI Electronics Trading LLC (MME) is a trusted supplier of Hioki test and measurement equipment in the UAE. We offer genuine products, competitive pricing, fast local delivery across Dubai, Abu Dhabi and the wider UAE, and knowledgeable after-sales support. Download the datasheet

Specifications

Technical Specifications for Electrical Safety Tester

Measurement Items	Insulation resistance (Applied DC voltage method)
Testing Voltage (Measurement Range)	AUTO/MANUAL setting is possible 25 V ≤ V < 100 V (2.000/20.00/200.0 MΩ) 100 V ≤ V < 500 V (2.000/20.00/200.0/2000 MΩ) 500 V ≤ V ≤ 1000 V (2.000/20.00/200.0/4000 MΩ)
Basic Accuracy	±2 % rdg. ±5 dgt. 25 V ≤ V < 100 V [0 to 20 MΩ] 100 V ≤ V < 500 V [0 to 20 MΩ] 500 V ≤ V ≤ 1000 V [0 to 20 MΩ]
Measurement Speed	Fast: 30 ms/time, Slow: 500 ms/time (selectable)
Display	LCD (service life: 100,000 hours), 4-level backlight
Internal Memory	Saved items include rated measurement voltage, comparator upper limit/lower limit values, test mode, beep sound to distinguish the result, test time, response time, resistance range, measurement speed Memory capacity: up to 10 items (can be saved/loaded)
Comparator Setting	UPPER_FAIL: Measured value ≥ upper limit value PASS: Upper limit value > measured value > lower limit value LOWER_FAIL: Measured value ≤ lower limit value
Judgement Process	Beep sound, PASS / U.FAIL/L. FAIL: light up on LED display, When UL_FAIL, U.FAIL / L.FAIL light up simultaneously, EXT.I/O output, judgement result can be obtained via RS-232C
Test Duration	Definition of test duration: Test duration = Response time + Measurement time Function: Set the time from voltage application until pass/fail assessment Configuration range: 0.045 s to 999.999 s (0.001 s resolution)
Response Time Timer	After the start of the test, comparator judgment operation can be prohibited until a set interval from 0.005 sec. to 999.999 sec. (at 0.001 sec. resolution) has passed.
Analog Output	DC +4 V f.s.
Interface	RS-232C (standard), External I/O (External control input, Judgment result), BCD output (ST5520-01 only)
Power Supply	100 to 240 V AC, 50/60 Hz, 25 VA max.
Dimensions and Mass	215 mm (8.46 in) W × 80 mm (3.15 in) H × 166 mm (6.54 in) D, 1.1 kg (38.8 oz)
Included Accessories	Instruction Manual ×1, Power cord ×1, EXT. I/O Connector ×1, Connector Cover ×1

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hassan – November 4, 2025

Rated 5 out of 5
The Hioki ST5520 model exceeds expectations with its accuracy and ease of use – highly recommended!

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