Metravi DIT-321 Digital Insulation Tester

A. Product Overview

The Metravi DIT-321 Digital Insulation Tester is an auto-range digital insulation resistance tester designed for electrical testing, preventive maintenance and fault inspection. It combines the function of an insulation resistance tester and a digital multimeter in one compact instrument.

It is mainly used to check the insulation resistance of electrical equipment and insulating materials. This helps users identify weak insulation, leakage risk, ageing insulation and possible electrical safety issues before they lead to breakdown or failure.

The DIT-321 supports insulation test voltages of 250V, 500V and 1000V. It can measure insulation resistance up to 40GΩ. Along with insulation testing, it also includes multimeter functions such as AC voltage, DC voltage, AC current, DC current, resistance, capacitance, frequency, diode test and continuity test.

Key features include:

Auto range operation
3-3/4 digit backlit LCD with maximum 4000 counts
Data hold function
Real-time insulation test voltage display
LED indication for high voltage output
Auto power-off after approximately 15 minutes
Battery operation using 6 AA batteries
Compact and portable body for field use

B. Working Principle

The Metravi DIT-321 works by applying a selected high DC test voltage across the insulation of the equipment under test. The available test voltage options in DIT-321 are 250V, 500V and 1000V.

When the test voltage is applied, the tester measures the leakage current passing through the insulation. Based on this leakage current, the instrument calculates and displays the insulation resistance value. A high insulation resistance value generally indicates good insulation condition, while a low value may indicate moisture, contamination, insulation ageing, damage or leakage path.

The DIT-321 can also monitor the actual output high voltage in real time. This helps avoid wrong readings caused by the test voltage not matching the rated output voltage. The catalogue explains that ordinary insulation meters may not show their own output high voltage, which can create measurement deviation and safety concerns.

C. Why It Is Used

The Metravi DIT-321 Digital Insulation Tester is used to verify the insulation health of electrical systems and equipment. Insulation failure can cause leakage current, short circuit, equipment damage, electric shock risk and unexpected downtime.

It is used for:

Testing insulation resistance of motors
Testing transformer insulation condition
Checking cable insulation before energising
Inspecting switchgear and electrical panels
Finding weak insulation in electrical equipment
Preventive maintenance of industrial machines
Troubleshooting leakage and breakdown problems
Testing electrical apparatus during commissioning
Supporting safety checks in maintenance work
Measuring voltage, current, resistance and continuity using built-in multimeter functions

This tester is useful because it allows technicians to perform both insulation testing and general electrical measurement using one portable instrument.

D. Suitable Buyers

The Metravi DIT-321 Digital Insulation Tester is suitable for:

Electrical maintenance engineers
Industrial maintenance teams
Panel builders
Electrical contractors
Motor rewinding workshops
Transformer service companies
Cable testing teams
Plant maintenance departments
Facility management teams
Power distribution maintenance teams
Electrical safety inspectors
Testing and calibration laboratories
OEMs and machine manufacturers
Electrical project contractors
Technical institutes and training centres

It is especially suitable for buyers who need a compact insulation tester with built-in multimeter functions for daily electrical maintenance and field testing.

FAQ

1. What is the use of Metravi DIT-321 Digital Insulation Tester?

The Metravi DIT-321 is used to measure insulation resistance of electrical equipment such as motors, cables, transformers, switches and electrical apparatus. It helps detect insulation weakness and leakage problems.

2. What test voltages are available in Metravi DIT-321?

The DIT-321 supports insulation test voltages of 250V, 500V and 1000V.

3. What is the maximum insulation resistance range of DIT-321?

The DIT-321 can measure insulation resistance up to 40GΩ, depending on the selected test voltage range.

4. Can Metravi DIT-321 be used as a multimeter?

Yes, the DIT-321 includes digital multimeter functions such as AC voltage, DC voltage, AC current, DC current, resistance, capacitance, frequency, diode test and continuity test.

5. Is the DIT-321 suitable for motor testing?

Yes, it is suitable for checking motor winding insulation resistance and identifying weak insulation before motor failure.

6. Can it be used for cable insulation testing?

Yes, the DIT-321 can be used to test cable insulation before installation, commissioning or maintenance.

7. Does the DIT-321 show actual test voltage?

Yes, the instrument can display the actual insulation test voltage and uses an LED indicator to show high voltage output status.

8. Why is insulation resistance testing important?

Insulation resistance testing helps detect insulation deterioration, moisture ingress, contamination and leakage paths. This reduces the risk of breakdown, short circuit and electrical safety hazards.

9. Is Metravi DIT-321 portable?

Yes, it is compact, battery-operated and convenient to carry for field testing and maintenance work.

10. What type of display does the DIT-321 have?

The DIT-321 has a 3-3/4 digit backlit LCD with a maximum display of 4000 counts.

11. Does it have a data hold function?

Yes, it has a data hold function to freeze the displayed reading.

12. Where is this tester commonly used?

It is commonly used in industries, electrical maintenance departments, substations, panel testing, motor workshops, cable testing, transformer maintenance and electrical inspection work.