Table of Contents

Application

The HF-LT-308 Digital Insulator Tester is mainly used for offline insulation resistance measurement of insulators to ensure reliable and safe operation of transmission lines. It can also work as a general megohmmeter to test insulation strength of other high-voltage electrical equipment.

The tester effectively detects hidden internal faults inside insulators and improves the reliability of power grids and work efficiency for field crews. It delivers simple, fast and quantitative resistance measurement for each insulator. It can identify insulators with leakage current that have not broken down and are at critical failure status. Measurement data is displayed in real time, and an audible alarm triggers automatically for low-value insulators below 300 MΩ.

Applicable Users

Power utilities, rural power transmission departments, large industrial and mining enterprises, research institutions and maintenance companies. It serves as professional testing equipment for insulator inspection in power systems.

Features

This digital insulator tester adopts combined digital-analog dual circuit design. It supports alarm for zero-value and degraded insulators and auto power-off function (power needs to be toggled again after auto shutdown). Multiple humanized upgrades on internal and external structure improve operability, practicality and reliability.

Compact and user-friendly for operation on transmission towers and poles:

Housing injection-molded with high-insulation modified ABS material.
Small size and light weight; dimensions 185mm×83mm×30mm, weight approx. 300g.
Stable high voltage output; powered by only four AA batteries, with 5-minute auto power-off without operation.
Supports single-hand operation during testing.
Digital display ensures accurate, stable and intuitive readings.

Technical Specifications

Item	Specification
Test Voltage	5000V
Measuring Range	0 ~ 1999 MΩ
Resolution	1 MΩ
Basic Error	±5%
Power Supply	4 × AA batteries, DC 6V
Ambient Condition	Temperature: -10℃ ~ +50℃; Relative Humidity ＜95%

Structure Description

Component	Description
LCD Screen	4-digit LCD display with unit symbols on upper front panel.
Resistance Key [RES MΩ]	Press to read resistance value.
Voltage Key [VOL KV]	Press to read output voltage value.
Power Switch [ON-OFF]	Sliding switch located on the top.
Measuring Rods	Two telescopic measuring rods on the left, fold inward for storage.
Battery Compartment	Removable cover on rear side for easy battery replacement.

FAQ for Digital Insulation Resistance Meter

Q1: What is a Digital Insulation Resistance Meter used for?

A1: It measures insulation resistance of cables, motors, transformers, insulators and other high-voltage equipment to detect insulation aging and hidden faults.

Q2: What test voltage options are available?

A2: Multiple voltage grades such as 500V, 1000V, 2500V and 5000V are optional to meet different test requirements.

Q3: Can it test transmission line insulators?

A3: Yes. It can measure the resistance of single insulator pieces and identify low-value or zero-value insulators.

Q4: How accurate are the measurement results?

A4: Typical basic error is within ±5%, with clear digital display for stable and intuitive readings.

Q5: What power supply methods are common?

A5: Most models adopt dry batteries or rechargeable lithium batteries, convenient for field outdoor testing.

Q6: Is single-hand field operation supported?

A6: Portable compact models support single-person operation, equipped with telescopic measuring rods for overhead line inspection.

Q7: What is the applicable working environment?

A7: Normally suitable for -10℃ ~ +50℃, relative humidity less than 95%, adapting to most outdoor substation and line inspection scenarios.

Q8: Will the instrument automatically alarm for defective insulation?

A8: Many versions support threshold judgment and audible alarm to remind operators of low-resistance defective equipment.

Q9: Does the meter have auto power-off function?

A9: Most portable designs feature auto power-off after idle time to save battery power.

Q10: Can it be used as a general-purpose megohmmeter?

A10: Yes, widely applicable for routine insulation inspection in power plants, power grids, industrial mines and maintenance companies.

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HF-LT-308 Digital Insulation Resistance Meter