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HTC DM-86 Digital Multimeter

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Voltage Measurement

Measures AC and DC voltage up to 1000V with an accuracy of 0.5% + 1 digit.

Current Measurement

Measures AC and DC current up to 10A with an accuracy of 1.0% + 1 digit.

Resistance Measurement

Measures resistance from 0.01 to 40M with an accuracy of 0.5% + 1 digit.

Continuity Test

Tests for continuity and detects diodes, capacitors, and resistors.

Frequency Measurement

Measures frequency from 10Hz to 100kHz with an accuracy of 0.1% + 1 digit.

Key Features

  • High Accuracy and Resolution: The HTC DM-86 offers high accuracy and resolution, making it suitable for precise measurements in various applications.
  • Auto-Range Function: The multimeter automatically selects the appropriate range for the measurement, eliminating the need for manual range selection.
  • Data Hold Function: The device can hold measurement data, allowing users to freeze the reading for easy observation and recording.
  • Backlit LCD Display: The large, backlit LCD display provides clear and easy-to-read measurements, even in low-light environments.
  • Battery Life: The multimeter operates on a single 9V battery, providing up to 200 hours of continuous use.
  • Compact and Durable Design: The HTC DM-86 is designed to withstand rough handling and features a compact design, making it easy to carry and store.
  • Protection against Overvoltage and Overcurrent: The multimeter is protected against overvoltage (up to 1000V) and overcurrent (up to 10A), ensuring user safety and device protection.
  • CAT III 1000V and CAT IV 600V Safety Rating: The HTC DM-86 meets the safety standards for Category III and Category IV electrical environments.

Additional Specifications

Operating Temperature

0C to 40C (32F to 104F)

Storage Temperature

-20C to 60C (-4F to 140F)

Dimensions

155 x 76 x 35mm (6.1 x 3 x 1.4 inches)

Weight

Approximately 250g (8.8 oz)

Conclusion

The HTC DM-86 Digital Multimeter is a reliable and feature-rich testing and measurement instrument suitable for a wide range of applications. Its high accuracy, versatility, and advanced features make it an ideal choice for professionals and hobbyists seeking a dependable and accurate multimeter for their electrical and electronics projects.

Pin Configuration

  • HTC DM-86 Digital Multimeter Pinout Explanation
  • The HTC DM-86 Digital Multimeter is an IoT-enabled multimeter that measures various electrical parameters such as voltage, current, resistance, and more. It features a 3-pin interface that allows connection to a microcontroller or other devices for data transmission and control. Below is a detailed explanation of each pin and how to connect them:
  • Pin 1: VCC (Power Supply)
  • Function: Provides power to the multimeter
  • Voltage: 3.3V to 5V (recommended operating voltage: 3.3V)
  • Connection:
  • + Connect VCC pin to a 3.3V or 5V power supply (e.g., from a microcontroller or a battery)
  • + Ensure the power supply is stable and regulated to prevent damage to the multimeter
  • Pin 2: GND (Ground)
  • Function: Provides a common ground reference for the multimeter
  • Connection:
  • + Connect GND pin to a common ground point in the system (e.g., to the ground pin of a microcontroller or a power supply)
  • + Ensure a reliable and low-resistance ground connection to prevent noise and interference
  • Pin 3: TXD (Transmit Data)
  • Function: Transmits measurement data from the multimeter to a host device (e.g., microcontroller)
  • Signal: UART (Universal Asynchronous Receiver-Transmitter) serial output
  • Baud Rate: Typically 9600 bps (adjustable through the multimeter's configuration)
  • Connection:
  • + Connect TXD pin to the RX ( Receive Data) pin of a microcontroller or a serial communication module
  • + Ensure proper serial communication configuration and baud rate matching between the multimeter and the host device
  • Connection Structure:
  • To connect the HTC DM-86 Digital Multimeter to a microcontroller or other devices, follow this structure:
  • VCC (Pin 1) 3.3V or 5V Power Supply
  • GND (Pin 2) Common Ground Point
  • TXD (Pin 3) RX Pin of Microcontroller or Serial Communication Module
  • Important Notes:
  • Always handle the multimeter with care to prevent damage from static electricity or physical stress.
  • Ensure proper electrical isolation and safety precautions when working with the multimeter and its connections.
  • Refer to the multimeter's datasheet and user manual for specific configuration and operating instructions.
  • Consult the microcontroller or host device's documentation for serial communication configuration and baud rate setup.

Code Examples

HTC DM-86 Digital Multimeter Documentation
Overview
The HTC DM-86 Digital Multimeter is a versatile and accurate measurement tool designed for various IoT applications. This digital multimeter provides precise readings of voltage, current, resistance, continuity, and diode testing, making it an essential component for prototyping, testing, and debugging IoT projects.
Technical Specifications
Measurement ranges:
	+ Voltage: 0-1000V AC/DC
	+ Current: 0-10A AC/DC
	+ Resistance: 0-40M
	+ Continuity: Audible beep and LED indication
	+ Diode test: 0-3V
 Accuracy: 0.5% for voltage and current, 1.0% for resistance
 Sampling rate: 3 times per second
 Power supply: 9V battery (included)
Code Examples
### Example 1: Measuring Voltage using Arduino
In this example, we will use the HTC DM-86 Digital Multimeter to measure the voltage of a battery using an Arduino board.
Hardware Requirements
HTC DM-86 Digital Multimeter
 Arduino Uno board
 Jumper wires
 9V battery
Code
```c
const int multimeterPin = A0;  // Analog input pin for multimeter
void setup() {
  Serial.begin(9600);
}
void loop() {
  int reading = analogRead(multimeterPin);
  float voltage = reading  5.0 / 1023.0;
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  delay(1000);
}
```
Explanation
In this example, we connect the HTC DM-86 Digital Multimeter to the Arduino Uno board's analog input pin A0. The `analogRead()` function reads the voltage value from the multimeter, and the `Serial.print()` function displays the voltage reading on the serial monitor.
### Example 2: Measuring Current using Raspberry Pi
In this example, we will use the HTC DM-86 Digital Multimeter to measure the current drawn by a DC motor using a Raspberry Pi.
Hardware Requirements
HTC DM-86 Digital Multimeter
 Raspberry Pi 4 board
 DC motor
 Jumper wires
 Breadboard
 Power supply (optional)
Code
```python
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
# Set up the multimeter pin as an input
multimeter_pin = 17
GPIO.setup(multimeter_pin, GPIO.IN)
while True:
    # Read the voltage value from the multimeter
    reading = GPIO.input(multimeter_pin)
    current = (reading  5.0) / 1023.0  # Convert voltage to current
    print("Current: {:.2f} mA".format(current))
    time.sleep(1)
```
Explanation
In this example, we connect the HTC DM-86 Digital Multimeter to the Raspberry Pi's GPIO pin 17. The `GPIO.input()` function reads the voltage value from the multimeter, and the `print()` function displays the current reading in milliamps.
Note: These code examples are for demonstration purposes only and may require modifications based on your specific IoT project requirements. Always follow safety guidelines when working with electrical components and ensure correct connections to avoid damage or injury.