Digital Insulation Resistance Tester | XHMR-10KVB
The XHMR-10KVB digital insulation resistance tester, also known as a megohmmeter or high-voltage insulation resistance tester, is designed for insulation resistance testing of transformers, motors, cables and electrical equipment. It offers six rated voltage levels, 250V, 500V, 1000V, 2500V, 5000V and 10kV, with a wide resistance measurement range from 0.01MΩ to 35TΩ, making it one of the most versatile insulation testers available for field and workshop use.
The instrument features a large LCD screen with gray backlight, data storage, data review, alarm and automatic shutdown functions. It also measures DC voltage, AC voltage, absorption ratio (DAR) and polarization index (PI). With its wide range, high resolution, convenient operation and easy portability, the XHMR-10KVB delivers accurate, reliable and stable performance with strong anti-interference capability. Its shockproof, dust-proof and moisture-proof structure makes it a commonly used and indispensable instrument for telecommunications, electric power, meteorology, computer rooms, oil fields, electromechanical installation and maintenance, and industrial enterprises that use electricity as industrial power or energy.
Applications & Target Audience: Engineered for telecom operators maintaining base stations and equipment rooms, meteorological and broadcasting facilities, oil field and petrochemical plant electrical maintenance teams, electromechanical installation and maintenance contractors, electric motor and transformer repair and rewinding workshops, and elevator and crane maintenance companies.
Key Specifications
| Parameter | Specification |
|---|
| Rated Test Voltages | 250V, 500V, 1000V, 2500V, 5000V, 10kV (6 levels) |
| Insulation Resistance Range | 0.01MΩ ~ 35TΩ, resolution 0.01MΩ |
| Test Voltage Accuracy | Rated voltage × (1 ±10%) |
| DC Voltage Range | 0 ~ 1000V, resolution 0.1V |
| AC Voltage Range | 0 ~ 750V, resolution 0.1V |
| DC Current Range | 0.1nA ~ 6mA |
| Capacitance Range | 10nF ~ 50uF |
| Output Short-circuit Current | ≥ 6mA |
| Absorption Ratio / Polarization Index | DAR and PI measurement supported |
| Data Storage | 500 groups, "FULL" symbol when storage is full |
| Power Supply | 12V rechargeable lithium battery, built-in charging |
| Display | 4-digit large LCD, 108mm × 65mm, gray backlight |
| USB Interface | Software monitoring, data upload to computer, save and print |
| Instrument Size | 240mm × 188mm × 85mm (L/W/H) |
| Weight | 2750g (including battery) |
| Insulation Resistance | ≥ 50MΩ (between measuring line and housing) |
| Withstand Voltage | AC 3kV/50Hz, 1 minute |
| Working Environment | -10°C ~ +50°C, <85%RH |
| Safety Standards | IEC61010-1, IEC1010-2-31, IEC61557-1/5, IEC60529 (IP54), pollution degree 2, CAT III 300V |
Advanced Features
- Six selectable test voltage levels from 250V to 10kV cover low-voltage control circuits to high-voltage cables
- Ultra-wide insulation resistance range from 0.01MΩ to 35TΩ with high resolution
- Absorption ratio and polarization index measurement for insulation condition assessment
- DC voltage (0~1000V) and AC voltage (0~750V) measurement functions
- 500-group data storage with review function, USB interface for software monitoring and report printing
- Alarm function when measured values exceed the alarm setting
- Large LCD with controllable gray backlight for use in dim places
- Automatic shutdown after 15 minutes to save battery power
- Shockproof, dust-proof and moisture-proof structure for harsh field environments
- Portable 2.75kg design with 12V rechargeable lithium battery
Six Test Voltages Explained
Choosing the right test voltage is essential for accurate insulation assessment. The XHMR-10KVB covers the full range of commonly used test voltages in one portable instrument.
| Test Voltage | Typical Test Object |
|---|
| 250V | Low-voltage control circuits, signal cables, communication equipment insulation |
| 500V | Motors and appliances rated below 500V, general industrial equipment |
| 1000V | Low-voltage distribution cables, switchgear and busbars |
| 2500V | Medium-voltage motors, transformers and distribution cables |
| 5000V | High-voltage motors, power transformers and HV cable insulation |
| 10kV | High-voltage cables, transformers and substation equipment insulation testing |
Absorption Ratio & Polarization Index
Insulation resistance alone is not always sufficient to judge insulation condition, especially for large equipment with significant capacitance. The absorption ratio (DAR) and polarization index (PI) compare insulation readings taken at different times during the test to reveal moisture and contamination inside the insulation.
Absorption Ratio (DAR): the ratio of the 60-second reading to the 15-second reading, used to detect moisture in insulation
Polarization Index (PI): the ratio of the 10-minute reading to the 1-minute reading, used to assess the overall insulation condition of large motors, generators and transformers
The XHMR-10KVB calculates DAR and PI automatically, eliminating manual timing and calculation errors
In general, PI values above 2.0 indicate good insulation, values between 1.0 and 2.0 suggest the insulation needs attention, and values below 1.0 indicate serious moisture or contamination
Interface & Operation
The instrument provides LINE, V, GUARD, EARTH, charger and USB interfaces. The high-voltage test terminal banana plug connects to the LINE interface, the shielded cable connector plugs into the GUARD interface when required, and the EARTH interface connects to the protective ground. The voltage select button cycles through the six test voltage levels, the test button starts the measurement, and the power button controls the instrument.
Connect the high-voltage test lead to the LINE interface and the ground lead to the EARTH interface of the tested equipment
Select the appropriate test voltage level with the voltage select button according to the rated voltage of the tested equipment
Press the test button to start the measurement and read the insulation resistance value on the large LCD display
For DAR or PI testing, keep the test running for the required time; the instrument calculates the ratios automatically
Review stored data with the MR function or upload it to a computer through the USB interface for saving and printing
Typical Application Scenarios
Telecom & Meteorological Facilities
Telecom base stations, switching rooms and meteorological observation stations rely on continuous power supply. Routine insulation testing of power cables, lightning protection systems and backup generators with the XHMR-10KVB helps prevent unexpected outages and service disruption.
Oil Fields & Petrochemical Plants
In explosive and corrosive environments, insulation degradation can lead to dangerous faults. The instrument's shockproof, dust-proof and moisture-proof structure and strong anti-interference capability make it suitable for the demanding conditions of oil field and petrochemical electrical maintenance.
Motor & Transformer Repair Workshops
Repair and rewinding workshops test insulation before and after rewinding to verify work quality. The 250V to 10kV voltage range covers small motors, large industrial motors and distribution transformers, while the 500-group storage records test history for each repaired unit.
Elevator & Crane Maintenance
Elevator and crane maintenance companies perform periodic insulation checks on motors, controllers and trailing cables. The portable 2.75kg design and rechargeable battery allow quick tests at customer sites without external power.
Safety & Standards
- Complies with IEC61010-1, IEC1010-2-31 and IEC61557-1/5 safety standards
- IP54 protection against dust and water splashes per IEC60529
- CAT III 300V overvoltage category, pollution degree 2
- Insulation resistance ≥50MΩ between measuring line and housing, withstand voltage AC 3kV/50Hz for 1 minute
- When the battery voltage is low, the low-battery symbol is displayed; charge the instrument in time
FAQ
Q1: What is the XHMR-10KVB digital insulation resistance tester used for?
It is used for insulation resistance testing of transformers, motors, cables and electrical equipment, and is widely applied in telecommunications, electric power, meteorology, computer rooms, oil fields, electromechanical installation and maintenance, and industrial enterprises.
Q2: What test voltages does it support?
It supports six rated voltage levels: 250V, 500V, 1000V, 2500V, 5000V and 10kV, with test voltage accuracy of rated voltage × (1 ±10%). The step-adjusting voltage function allows a wide range of applications.
Q3: What is the measurement range of the instrument?
The insulation resistance measurement range is 0.01MΩ to 35TΩ with a resolution of 0.01MΩ. It also measures DC voltage up to 1000V, AC voltage up to 750V, DC current from 0.1nA to 6mA, and capacitance from 10nF to 50uF.
Q4: Does it support data storage and management?
Yes. The instrument stores up to 500 groups of data, supports data review with the MR function, and provides a USB interface for software monitoring. Stored data can be uploaded to a computer, saved and printed.
Q5: Who is this insulation resistance tester designed for?
It is designed for telecom operators, meteorological and broadcasting facilities, oil field and petrochemical maintenance teams, electromechanical installation and maintenance contractors, motor and transformer repair workshops, and elevator and crane maintenance companies.
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