1. Introduction
The HABOTEST HT5910 is a professional safety compliance testing instrument designed for electrical installations. It is used for house acceptance, core engineering, office circuit inspection, and factory equipment inspection to ensure leakage safety and circuit wiring compliance with national safety regulations. This manual provides essential information for the safe and effective use of your HT5910 RCD/Loop Tester.

2. Package Contents
Please check the package contents upon receipt to ensure all items are present and undamaged:
- 1 x HABOTEST HT5910 RCD/Loop Tester
- 1 x Carrying Bag
- 1 x Application CD (for data management)
- 1 x USB Data Cable
- 1 x Set of Alligator Clips (Red, Green, Black)
- 1 x Set of Test Leads (Red, Green, Black)
- 1 x English User Manual

3. Specifications
The following table details the technical specifications of the HT5910 RCD/Loop Tester:

| Function | Range | Accuracy | Resolution |
|---|---|---|---|
| Tripping time (x1) | IΔN300 (slow 500ms) | ±3ms | 0.1ms |
| Tripping time (x5) | IΔN40ms (slow 150ms) | ||
| Tripping Current | (0.2-1.1)IΔN | ±0.1IΔN | 0.5IΔN |
| Contact Voltage | 0-99.9V | ±(10%+0.2V) | 0.01~0.1V |
| ACV (UL-N, UL-L, UL-E) | 0-440V | ±(3%+3V) | 1V |
| Frequency | AC, 45-65Hz | ±1Hz | 1Hz |
| Loop resistance (RL) | 0.1-2000Ω | ±(10%+0.2) | 0.1Ω |
| RL Test Current | 0.5 IΔN | ±(10%+10) | |
| Test current ratio | x0.5, x1, x5 | ||
| Current Level (IΔN) | 10mA, 30mA, 100mA, 300mA, 500mA | ||
| Trigger Phase Angle | 0° or 180° | ||
| Auto power off | Yes | ||
| Backlight | Yes | ||
| USB | Yes | ||
| Low battery indication | Yes | ||
| Data memory | Up to 1000 sets | ||
| Power | 8x1.5V AA batteries (not included) | ||
| Product Weight | Approx. 708g | ||
| Product Size | 188 x 145 x 73mm | ||
| Safety Rating | EN61010-1, EN61557-3, EN61326-1, CAT IV 600V, CAT III 1000V | ||

4. Device Layout and Controls
Familiarize yourself with the various parts and controls of the HT5910 tester:

- AC IN Test Terminals: Input for connecting test leads (80V-440V AC).
- USB Port: Used to connect the tester to a PC for data upload.
- Display Screen: High-definition backlit LCD for displaying measurement data.
- Display/Set Key: Used to adjust display settings or confirm selections.
- Backlight Key: Activates or deactivates the display backlight.
- Previous/Backward Search Keys: Used for navigating stored data.
- SLOW Key: Activates slow testing modes.
- Function Knob: Rotary switch to select different measurement functions (OFF, U, LOOP, RCD x1/2, RCD x1, RCD x5, AUTO RAMP).
- Measurement Key: Initiates a measurement.
- Memo/Read Key: Stores current measurement data or recalls stored data.
- Clear Key (CLR): Clears current data or settings.
- Enter Key: Confirms selections or actions.

Display Screen Indicators:
- Socket normal connection: Indicates correct wiring.
- Current multiplication factor: x0.5, x1, x5.
- S measurement mode: Specific measurement mode indicator.
- Alarm prompt: Visual warning for various conditions.
- Auto power off: Indicates auto-shutdown feature is active.
- Phase wire to ground wire / Phase wire to neutral wire / Neutral wire to ground wire: Connection type indicators (LINE, L-PE, L-N, N-PE).
- Measurement value: Displays the numerical result.
- Used/Read/Stored: Indicates status of data memory.
- Measurement unit: VHzkmAsGMkΩ.
- Exceed/Loop voltage/Nominal trigger current: Specific measurement parameters.
- AC voltage: Indicates AC measurement.
- Excessive range: Warning for out-of-range measurements.
- Phase wire to neutral wire direction: Indicates phase direction.
- Trigger angle: 0° or 180°.
- Test line with high voltage: Warning for high voltage on test leads.
- Battery level indication: Shows remaining battery life.
5. Setup
5.1 Battery Installation
The HT5910 requires 8x 1.5V AA batteries (not included). To install:
- Ensure the device is turned OFF.
- Locate the battery compartment on the back of the tester.
- Open the battery compartment cover.
- Insert 8 AA batteries, observing the correct polarity (+/-) as indicated inside the compartment.
- Close the battery compartment cover securely.

5.2 Connecting Test Leads
Connect the provided test leads and alligator clips to the AC IN test terminals on the top of the device. Ensure a secure connection for accurate measurements and safety.

6. Operating Instructions
Before operating, ensure you have read and understood all safety warnings. Always wear appropriate personal protective equipment (PPE).
6.1 Power On/Off
Rotate the Function Knob from the 'OFF' position to any desired measurement function to power on the device. To power off, rotate the Function Knob back to 'OFF'. The device also features an automatic shutdown after 10 minutes of inactivity.
6.2 Function Selection
Use the Function Knob to select the desired measurement mode:
- **U:** Voltage measurement.
- **LOOP:** Loop resistance measurement.
- **RCD x1/2, RCD x1, RCD x5:** RCD (Residual Current Device) tripping time and current measurements at different current multiplication factors.
- **AUTO RAMP:** Automatic RCD ramp test.

6.3 Performing a Measurement
- Select the desired function using the Function Knob.
- Connect the test leads to the circuit or component to be measured, ensuring correct and safe connections (e.g., L-N, L-PE).
- Press the 'MEASURE' key to initiate the measurement.
- Read the results on the display screen.
6.4 Data Storage and Recall
The HT5910 can store up to 1000 sets of measurement data.
- To Store Data: After a measurement is complete, press the 'MEMO/READ' key to save the data.
- To Recall Data: Press the 'MEMO/READ' key repeatedly to cycle through stored data. Use the Previous/Backward search keys to navigate.
- To Clear Data: Press the 'CLR' key.

6.5 USB Data Upload
The device features a 2.0 USB data upload interface. Connect the tester to a PC using the provided USB cable to transfer stored measurement data for analysis and reporting.

7. Safety Features and Warnings
- Input Voltage Indication: If the AC input voltage exceeds 440V (RMS) during measurement, the meter will display ">440V". If the input voltage exceeds 30V, the "!" symbol will be displayed on the LCD to indicate caution.
- Low Battery Warning: When the instrument's battery voltage is low, a battery symbol will appear in the upper right corner of the screen, indicating the need for battery replacement.
- Auto Power Off: The device automatically shuts down if there is no operation within 10 minutes of turning it on. To resume, rotate the Function Knob to the OFF position, wait 5 seconds, then select a function.
- Rubber Protective Cover: The PVC rubber protective cover provides shock resistance, abrasion resistance, and durability.


8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, remove the batteries to prevent leakage.
- Battery Replacement: Replace batteries promptly when the low battery indicator appears to ensure accurate readings and prevent device malfunction.
- Protective Cover: The rubber protective cover is designed for durability. Ensure it is properly fitted to protect the device from physical damage.
9. Troubleshooting
- Device not powering on: Check battery installation and ensure batteries are not depleted.
- Inaccurate readings: Ensure test leads are securely connected and the correct function is selected. Check for low battery indication.
- Display warnings: Refer to the 'Safety Features and Warnings' section for explanations of display symbols like ">440V", "!", and the low battery icon.
- Data transfer issues: Ensure the USB cable is properly connected to both the tester and the PC, and that the necessary software (from the application CD) is installed.
10. User Tips
- Regular Calibration: For professional use, consider regular calibration of the device to maintain measurement accuracy. Refer to the full user manual or contact customer support for calibration service information.
- Environmental Conditions: Always operate the tester within its specified environmental conditions to ensure optimal performance and longevity.
- Safety First: Always prioritize safety. Double-check connections and settings before performing any electrical measurements.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact details provided in the full English User Manual included in your package or visit the official HABOTEST website.





