HZ-521 Cable Outer Sheath Fault Tester

The Cable Outer Sheath Fault Tester is designed based on the Murray bridge principle and is capable of locating both breakdown points and insulation defect points with low resistance in various wires and cables.

The device integrates a voltage regulator and an R-type transformer to form a high-voltage constant-current source, featuring push-button voltage adjustment. It provides a no-load voltage of 7,500V and a short-circuit current of 100mA. A high-sensitivity amplifier and galvanometer are used to indicate bridge balance, combined with a proportional potentiometer to form a balanced bridge-all placed at high potential. The specially designed dual-core high-voltage rubber cable employs a four-terminal resistance measurement method to eliminate errors caused by lead resistance.

The control panel is entirely at low potential. With one-button operation, cable length can be automatically entered to calculate the fault distance. The high-voltage source and bridge are integrated into a portable protective housing, making the device high-voltage capable, lightweight, easy to operate, and safe to use.

Technical Parameters

Layout And Description Of The Instrument

1.Galvanometer: Adjustable electrical balance zero point.

2.Ammeter: Output current indication in mA.

3.Voltmeter: High-voltage output indication in kV.

4.High-voltage indicator light: This light turns on when there is high-voltage output.

5.Display screen: Displays operation content.

6.Zero-position indicator light: When this light is on, it indicates that the voltage output is at zero.

7.Power socket: Instrument working power supply, AC 220V connection port.

8.Fuse holder: Installation location for the fuse in the AC 220V power supply system.

9.Power switch: "I position" turns on the AC 220V power supply switch, "0 position" turns off the system power.

10.Start button: When the zero-position light is on, indicating that the voltage output is at zero, pressing this button is effective. If the zero-position light does not turn on after turning on the power switch, press the decrease voltage button until the light turns on. When the zero-position light is on, press this button to start high-voltage output.

11.Stop button: Press this button to cut off high-voltage output when the test is complete or an abnormality occurs.

12.Increase voltage button: Press this button to increase the output high voltage from low to high.

13.Decrease voltage button: Press this button to decrease the output high voltage from high to low.

14.Select: "Select" encoder switch operation convention: Rotate - cursor movement or number modification operation; Press - execute or confirm operation.

15.Sensitivity adjustment: ①. Switch for built-in battery power supply; ②. Adjust the sensitivity level, used in conjunction with the zero adjustment knob.

16.Zero adjustment knob: Rotate the zero adjustment knob to make the galvanometer indicate zero.

17.Balance adjustment: Adjust the balance knob until the galvanometer shows a significant deflection, then adjust it to indicate zero. (If the pointer deflects to the left, rotate clockwise; if it deflects to the right, rotate counterclockwise.) Observe and record the reading P1.

18.Indicator light: Built-in battery working indicator light, which turns on when the sensitivity adjustment is turned on.

19.Reference phase: The black clip of the output wire is connected to the reference phase.

20.Fault phase: The red clip of the output wire is connected to the fault phase.

21.Charging: DC 8.4V charging port, connect an 8.4V charger to start charging.

22.Grounding terminal: Instrument grounding point for safety protection.

Customized solutions

We understand that each client's needs are unique, so we can tailor solutions to meet your specific requirements to meet individual client needs.

Quality control

We strictly abide by the international quality management system and strictly control every link from raw material procurement, production process, product quality inspection, etc. to ensure the stability and reliability of our products and services.

Our service
The company has a professional sales team to provide you with high-quality pre-sales consulting services. During the order production process, customers can communicate with us at any time to understand the production progress. At the same time, we provide high-quality after-sales service to meet the different needs of customers.

1. When can I get a price quote?

You can contact us online or submit an inquiry. We typically provide a quote within 24 hours after receiving your request.

2. How do you handle after-sale service for overseas customers?

For issues occurring with our products, we offer:

12-month warranty coverage (see details below).

Online technical guidance to troubleshoot problems remotely.

Replacement parts shipped promptly based on your needs.

On-site support (if required): Our engineers can travel abroad to resolve critical issues.

3. What is the warranty period?

Our standard warranty period is 12 months (1 year). During this time, we provide:

Free technical support.

Replacement parts for manufacturing defects.

Solutions tailored to your specific issue.

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