1. Introduction
The KAIWEETS HT112B is an auto-ranging digital multimeter designed for accurate measurement of various electrical parameters. This ultra-portable device is suitable for diagnosing automotive, industrial, and household electrical issues. It features a Smart Mode for automatic measurement identification and a large LCD backlit screen for easy readability.
Image 1.1: KAIWEETS HT112B Digital Multimeter, including test leads and a protective carrying case.
2. Safety Information
Read all safety warnings and instructions before operating this device.
- This multimeter is CE & RoHS certified and features overload protection on all ranges.
- Always ensure the test leads are correctly inserted into the appropriate input jacks for the measurement being performed.
- Do not attempt to measure voltages or currents exceeding the maximum specified limits.
- Exercise extreme caution when working with live circuits. High voltages can cause severe injury or death.
- The rubber sleeve provides additional drop protection; however, avoid dropping the device from significant heights.
- Replace batteries promptly when the low battery indicator appears to ensure accurate readings.
Image 2.1: The HT112B multimeter features a durable insulating rubber sleeve for enhanced safety and protection against drops.
3. Product Overview
3.1. Components
The KAIWEETS HT112B includes the following main components:
- Digital Multimeter Unit (HT112B)
- Test Leads (Red and Black)
- Carrying Tool Bag
- Button Batteries (CR2032, 2 for use, 2 for backup)
- Instruction Manual
Image 3.1: The HT112B package contents, including the multimeter, test leads, carrying case, and spare batteries.
3.2. Display and Buttons
The multimeter features a large LCD backlit screen and intuitive buttons for operation.
Image 3.2: The HT112B display indicating various measurement modes and functions.
- Power Button: Turns the device on/off.
- SMART FUNC Button: Activates Smart Mode or cycles through specific functions within a mode.
- SEL Button: Selects between different measurement types (e.g., AC/DC voltage, resistance/continuity).
- H / Backlight Button: Toggles data hold and backlight.
- Input Jacks: For connecting test leads (COM, VΩmA, A).
4. Setup
4.1. Battery Installation
The KAIWEETS HT112B uses CR2032 button batteries. The device comes with batteries pre-installed and includes spares.
- Ensure the multimeter is powered off.
- Locate the battery compartment on the back of the device.
- Open the compartment cover using a suitable tool (e.g., small screwdriver).
- Insert the CR2032 batteries, observing the correct polarity (+/-).
- Close the battery compartment securely.
Note: If the multimeter will not be used for an extended period, it is recommended to remove the batteries to prevent drainage or leakage.
4.2. Connecting Test Leads
Always connect the black test lead to the "COM" (Common) jack. Connect the red test lead to the appropriate jack based on the measurement type:
- VΩmA Jack: For Voltage, Resistance, Continuity, Capacitance, Frequency, Diode, and small Current (mA/µA) measurements.
- A Jack: For large Current (Amperes) measurements.
Image 4.1: Correct connection of red and black test leads to the multimeter's input jacks.
5. Operating Modes and Measurements
The HT112B offers various measurement functions, including a convenient Smart Mode.
5.1. Smart Mode
Upon powering on, the multimeter defaults to Smart Mode. In this mode, the device automatically identifies and measures Voltage, Resistance, and Continuity. This simplifies operation as you do not need to manually select the function.
Image 5.1: The multimeter display indicating "Auto" when operating in Smart Mode, automatically detecting the measurement type.
5.2. Manual Function Selection
Press the "SMART FUNC" button to cycle through other measurement functions or to manually select a specific mode if Smart Mode is not desired or for specialized measurements.
5.2.1. Voltage Measurement (AC/DC)
To measure voltage, connect the test leads in parallel to the circuit or component. Use the "SEL" button to switch between AC and DC voltage if needed.
Image 5.2: Measuring the DC voltage of a car battery using the HT112B multimeter.
Image 5.3: Measuring AC voltage from a standard power outlet using the HT112B multimeter.
5.2.2. Resistance Measurement
Ensure the circuit is de-energized before measuring resistance. Connect the test leads across the component to be measured.
5.2.3. Continuity Test
For continuity, the multimeter will emit an audible beep if the resistance between the two points is below a certain threshold, indicating a continuous path.
Image 5.4: Performing a continuity test with the HT112B multimeter, indicated by an audible alert.
5.2.4. Current Measurement (AC/DC)
To measure current, the multimeter must be connected in series with the circuit. Ensure the correct input jack (mA/µA or A) is used and the circuit is within the multimeter's current rating.
Image 5.5: Measuring current in a small electronic circuit using the HT112B multimeter.
5.2.5. Capacitance Measurement
Discharge capacitors before measuring. Connect the test leads across the capacitor terminals.
Image 5.6: The HT112B multimeter connected to a large capacitor for capacitance measurement.
5.2.6. Frequency Measurement
Connect the test leads to the signal source to measure its frequency.
5.2.7. Diode Test
Connect the test leads across the diode. The display will show the forward voltage drop for a good diode.
Image 5.7: Performing a diode test with the HT112B multimeter, showing the test leads connected to a diode.
5.2.8. Non-Contact Voltage (NCV) / Live Wire Detection
The NCV function allows for detection of AC voltage without direct contact. Hold the top of the multimeter near the conductor. The device will indicate the presence of voltage.
Image 5.8: The HT112B multimeter detecting non-contact voltage near an electrical outlet.
6. Maintenance
6.1. Cleaning
Wipe the multimeter casing with a damp cloth. Do not use abrasive cleaners or solvents. Ensure the device is dry before use.
6.2. Battery Replacement
When the low battery indicator appears on the display, replace the CR2032 batteries as described in Section 4.1. Timely battery replacement ensures accurate readings and proper device function.
6.3. Fuse Replacement
If the current measurement function stops working, the internal fuse may need replacement. Refer to the detailed instructions in the full manual for fuse access and replacement procedures. Always use a fuse with the specified rating.
Image 6.1: The multimeter display showing a "FUSE" indicator, suggesting the need for fuse inspection or replacement.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Multimeter does not power on. | Dead or incorrectly installed batteries. | Check battery polarity; replace batteries. |
| Inaccurate readings. | Low battery, incorrect mode selection, or poor test lead connection. | Replace batteries, verify mode, ensure secure lead connection. |
| No current measurement. | Blown fuse. | Replace the internal fuse with the correct rating. |
| Display is dim or blank. | Low battery or backlight off. | Replace batteries, press the backlight button. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | KAIWEETS |
| Model Number | HT112B |
| Display | 6000 Counts, Digital LCD with Backlight |
| Measurement Type | TRMS (True RMS) |
| Power Source | Battery Powered (CR2032 x 2) |
| Safety Rating | CAT III 600V |
| Compliance | CE & RoHS Certified |
| Item Weight | 269 g (approx. 9.5 Ounces) |
| Dimensions | 16.76 x 9.65 x 5.08 cm (Package) |
| Included Components | Multimeter, Storage Bag, Test Leads, Batteries, Manual |
9. Warranty and Support
KAIWEETS provides a 36-month after-sale service and lifetime technical support for the HT112B Digital Multimeter. For any concerns or assistance, please contact KAIWEETS customer support.
Contact information can typically be found on the official KAIWEETS website or through your purchase platform.
