1. Introduction
This manual provides detailed instructions for the safe and effective use of the ANENG AN870 Digital Multimeter. The AN870 is a battery-powered, True-RMS, auto-ranging digital multimeter featuring a 19999-count LCD display with backlight. It is designed for measuring AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Diode, Continuity, Frequency, Duty Cycle, and Temperature. Its stable function, high reliability, and overload protection make it an ideal tool for professionals and hobbyists alike.
2. Product Features
- 19999 Counts Display: High-resolution LCD for precise readings.
- True-RMS Measurement: Provides accurate readings for non-sinusoidal waveforms.
- Auto-Ranging: Automatically selects the correct measurement range.
- Multi-Functionality: Measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Diode, Continuity, Frequency, Duty Cycle, and Temperature.
- Backlight Display: Ensures clear readability in low-light conditions.
- Data Hold: Freezes the displayed reading for convenient recording.
- Relative Measurement: Allows for comparison of measurements.
- Overload Protection: Enhances safety and durability.
- Low Voltage Indication: Alerts when battery power is low.
- Auto Power Off: Conserves battery life.
Image: The ANENG AN870 Digital Multimeter's display showing '19999 COUNTS' for voltage measurement, highlighting its high resolution.
3. Package Contents
Upon opening your ANENG AN870 Digital Multimeter package, please verify that all the following items are included:
- ANENG AN870 Digital Multimeter
- Test Leads (Red and Black)
- Temperature Probe
- Multi-function Test Leads / Alligator Clips
- User Manual (this document)
- Carrying Case
Image: The ANENG AN870 Digital Multimeter, along with its test leads, temperature probe, and other accessories, neatly organized within its protective carrying case.
Image: A close-up view of the various test leads, including standard probes and alligator clips, and other small accessories that come with the multimeter.
4. Setup
4.1 Battery Installation
The ANENG AN870 Multimeter requires 2 x 1.5V AAA batteries (not included). To install or replace batteries:
- Ensure the multimeter is turned OFF.
- Locate the battery compartment cover on the back of the unit.
- Use a screwdriver to loosen the screw securing the cover.
- Remove the battery compartment cover.
- Insert the AAA batteries, observing the correct polarity (+ and -) as indicated inside the compartment.
- Replace the battery compartment cover and tighten the screw.
Image: The rear view of the ANENG AN870 Multimeter with its battery compartment open, showing where the batteries are inserted.
4.2 Connecting Test Leads
Always connect the test leads correctly for the desired measurement:
- Insert the black test lead into the COM (Common) jack.
- For most voltage, resistance, continuity, diode, capacitance, and frequency measurements, insert the red test lead into the VΩHz jack.
- For current measurements up to 400mA, insert the red test lead into the mAµA jack.
- For high current measurements up to 10A, insert the red test lead into the 10A jack.
5. Operating Instructions
5.1 Power On/Off
Rotate the function switch from the OFF position to any desired measurement function to turn the multimeter ON. To turn the multimeter OFF, rotate the function switch back to the OFF position.
5.2 Measurement Functions
Select the desired measurement function by rotating the central rotary switch. Use the 'SELECT' button to toggle between AC/DC modes or different sub-functions within a range (e.g., Resistance, Diode, Continuity).
- Voltage Measurement (V~ / V-): Connect leads in parallel with the circuit.
- Current Measurement (A~ / A-): Connect leads in series with the circuit. Ensure correct jack (mAµA or 10A) is used.
- Resistance Measurement (Ω): Ensure circuit is de-energized before measuring.
- Capacitance Measurement (F): Ensure capacitor is discharged before measuring.
- Diode Test (→|): Used to check diode functionality and forward voltage drop.
- Continuity Test (•))): Emits an audible tone if resistance is below a certain threshold.
- Frequency (Hz) / Duty Cycle (%): Measures the frequency and duty cycle of AC signals.
- Temperature Measurement (°C/°F): Use the included temperature probe.
Image: A user holding the ANENG AN870 Multimeter and its test leads, performing a measurement on a circuit board, demonstrating typical usage.
5.3 Special Functions
- RANGE: Press to manually select a range instead of auto-ranging.
- RELΔ (Relative Measurement): Press to store the current reading as a reference for subsequent measurements.
- MAX/MIN: Press to display the maximum or minimum reading recorded during a measurement session.
- HOLD/* (Data Hold/Backlight): Press briefly to hold the current reading. Press and hold to toggle the backlight.
- NCV (Non-Contact Voltage): Detects AC voltage without direct contact.
6. Maintenance
6.1 Cleaning
Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the terminals free of dirt and moisture.
6.2 Battery Replacement
Refer to Section 4.1 for battery replacement instructions when the low battery indicator appears on the display.
6.3 Fuse Replacement
If the current measurement function fails, the fuse may need replacement. This should only be performed by qualified personnel. Refer to the specifications for fuse type and rating.
6.4 Storage
If the multimeter is not used for a long period, remove the batteries to prevent leakage and damage. Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
7. Troubleshooting
If you encounter issues with your ANENG AN870 Multimeter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No display or dim display | Low or dead batteries; Incorrect battery installation. | Replace batteries; Check battery polarity. |
| "OL" (Overload) displayed | Input value exceeds selected range; Input value exceeds maximum rating. | Switch to a higher range (if not in auto-range); Ensure input is within device limits. |
| Inaccurate readings | Poor test lead connection; Interference; Damaged test leads. | Ensure leads are firmly connected; Move away from strong electromagnetic fields; Replace damaged leads. |
| Current measurement not working | Blown fuse; Incorrect lead connection. | Check and replace fuse (if qualified); Ensure red lead is in mAµA or 10A jack. |
8. Specifications
The following table details the technical specifications of the ANENG AN870 Digital Multimeter:
| Parameter | Specification |
|---|---|
| Display | 19999 Counts LCD with Backlight |
| Main Measurements | AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Diode, Continuity, Frequency, Duty Cycle, Temperature |
| DC Voltage | 400mV/4V/40V (±0.5%+4), 400V/600V (±0.8%+4) |
| AC Voltage | 400mV (±1.5%+4), 4V/40V/400V (±1.2%+4), 600V (±1.5%+4) |
| DC Current | 40mA/400mA (±1.0%+4), 10A (±1.5%+4) |
| AC Current | 40mA/400mA/10A (±2.0%+4, 50-200Hz) |
| Resistance | 400Ω/4K/40K/400K/4MΩ (±0.8%+4), 40MΩ (±2.0%+4) |
| Frequency | 1Hz to 10MHz (99.5/999.5/9.999k/99.99k/999.9k/9.999MHz) (±0.08%+2) |
| Duty Cycle | 0.1% to 99.9% (±0.08%+2) |
| Over Range Indication | OL |
| Working Environment | 0~40°C, relative humidity < 80% |
| Power Supply | 3V (2 x 1.5V AAA batteries) |
| Dimensions | 130 x 65 x 30mm |
| Material | ABS |
| Item Model Number | ANENG 19999 Counts Digital Multimeter |
| UPC | 630282714588 |
Image: A diagram illustrating the physical dimensions of the ANENG AN870 Multimeter, showing its length, width, and thickness.
Image: A side view of the ANENG AN870 Multimeter, showing its integrated kickstand extended for convenient hands-free operation on a workbench.
9. Warranty and Support
For any technical support or inquiries regarding your ANENG AN870 Digital Multimeter, please refer to the contact information provided with your purchase or visit the manufacturer's official website. Keep your purchase receipt as proof of purchase for any warranty claims.
