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HTC DM-98 Digital Multimeter

HTC DM-98 Digital Multimeter HTC DM-98 Digital Multimeter
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Operating Temperature

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

Storage Temperature

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

Dimensions

183 x 86 x 46 mm (7.2 x 3.4 x 1.8 in)

Weight

Approximately 350 g (12.3 oz)

Accessories

1 x HTC DM-98 Digital Multimeter

1 x 9V Battery

1 x Thermocouple (K-type)

1 x User Manual

1 x Protective Holster

Warranty

The HTC DM-98 Digital Multimeter is backed by a 2-year warranty, ensuring peace of mind and protection against manufacturing defects.

Pin Configuration

  • HTC DM-98 Digital Multimeter Pinout Explanation and Connection Guide
  • The HTC DM-98 Digital Multimeter is a versatile and accurate measuring instrument used to measure various electrical parameters such as voltage, current, resistance, continuity, and more. This documentation provides a detailed explanation of the pinout and connection guide for the HTC DM-98 Digital Multimeter.
  • Pinout Explanation:
  • 1. COM (Common) Pin:
  • The COM pin is the common terminal for all measurements. It is the reference point for the multimeter and is usually connected to the negative terminal of the circuit or device being measured.
  • 2. VmA Pin:
  • The VmA pin is a multifunctional terminal used for measuring voltage, resistance, and current. It is used in conjunction with the COM pin to perform various measurements.
  • 3. mA Pin:
  • The mA pin is specifically designed for measuring current in the milliampere range. It is used in conjunction with the COM pin to measure current.
  • 4. 10A Pin:
  • The 10A pin is used for measuring higher currents up to 10 amps. It is used in conjunction with the COM pin to measure current.
  • 5. Voltage Input Pins (V):
  • The voltage input pins (V) are used for measuring voltage. They are usually labeled as V or VIN.
  • Connection Guide:
  • Measuring Voltage:
  • Connect the COM pin to the negative terminal of the circuit or device.
  • Connect the VmA pin to the positive terminal of the circuit or device.
  • Select the voltage measurement function on the multimeter.
  • Read the voltage measurement on the multimeter display.
  • Measuring Current (mA):
  • Connect the COM pin to the negative terminal of the circuit or device.
  • Connect the mA pin to the positive terminal of the circuit or device.
  • Select the current measurement function on the multimeter.
  • Read the current measurement on the multimeter display.
  • Measuring Current (10A):
  • Connect the COM pin to the negative terminal of the circuit or device.
  • Connect the 10A pin to the positive terminal of the circuit or device.
  • Select the current measurement function on the multimeter.
  • Read the current measurement on the multimeter display.
  • Measuring Resistance:
  • Connect the COM pin to one terminal of the resistor or device.
  • Connect the VmA pin to the other terminal of the resistor or device.
  • Select the resistance measurement function on the multimeter.
  • Read the resistance measurement on the multimeter display.
  • Important Safety Notes:
  • Always ensure the multimeter is set to the correct measurement function and range before taking a measurement.
  • Always use the correct leads and connectors to prevent damage to the multimeter or the device being measured.
  • Always follow proper safety procedures when working with electrical circuits and devices.
  • By following this pinout explanation and connection guide, users can accurately measure various electrical parameters using the HTC DM-98 Digital Multimeter.

Code Examples

HTC DM-98 Digital Multimeter Documentation
Overview
The HTC DM-98 Digital Multimeter is a versatile and accurate measurement device designed for a wide range of applications, from DIY projects to industrial settings. This multimeter measures voltage, current, resistance, continuity, and diode test, making it an essential tool for troubleshooting and debugging electrical circuits.
Technical Specifications
Measurement ranges:
	+ Voltage: 0-1000V AC/DC
	+ Current: 0-10A AC/DC
	+ Resistance: 0-20M
	+ Continuity: Audible beep and LED indication
	+ Diode test: 2.8V  0.2V
 Accuracy: 0.5% for voltage and current measurements, 1% for resistance measurements
 Sampling rate: 3 times per second
 Power source: 9V battery (included)
Code Examples
The HTC DM-98 Digital Multimeter can be used with various microcontrollers and programming languages. Here are three examples demonstrating its use in different contexts:
### Example 1: Arduino based Voltage Measurement
In this example, we will use the HTC DM-98 to measure the voltage of a battery connected to an Arduino board.
Hardware Requirements
HTC DM-98 Digital Multimeter
 Arduino Board (e.g., Arduino Uno)
 Breadboard and jumper wires
 9V battery
Software Requirements
Arduino IDE
Code
```cpp
const int multimeterPin = A0; // Analog input pin for multimeter
void setup() {
  Serial.begin(9600);
}
void loop() {
  int voltageReading = analogRead(multimeterPin);
  float voltage = voltageReading  (5.0 / 1023.0);
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  delay(1000);
}
```
### Example 2: Raspberry Pi based Current Measurement with Python
In this example, we will use the HTC DM-98 to measure the current flowing through a circuit connected to a Raspberry Pi.
Hardware Requirements
HTC DM-98 Digital Multimeter
 Raspberry Pi (e.g., Raspberry Pi 4)
 Breadboard and jumper wires
 5V power source (e.g., USB cable)
Software Requirements
Python 3.x
 RPi.GPIO library
Code
```python
import time
import RPi.GPIO as GPIO
# Set up GPIO mode
GPIO.setmode(GPIO.BCM)
# Set up multimeter pin as an input
multimeter_pin = 17
GPIO.setup(multimeter_pin, GPIO.IN)
while True:
    # Read the current measurement from the multimeter
    current_reading = GPIO.input(multimeter_pin)
    current_mA = current_reading  (5.0 / 1023.0)  1000
    print("Current: {:.2f} mA".format(current_mA))
    time.sleep(1)
```
### Example 3: Internet of Things (IoT) Application with ESP32 and Wi-Fi
In this example, we will use the HTC DM-98 to measure the resistance of a sensor connected to an ESP32 board, and send the data to a cloud-based IoT platform using Wi-Fi.
Hardware Requirements
HTC DM-98 Digital Multimeter
 ESP32 board (e.g., ESP32 DevKitC)
 Breadboard and jumper wires
 Wi-Fi router
 Sensor (e.g., photoresistor)
Software Requirements
ESP32 Arduino Core
 Wi-Fi library
Code
```cpp
#include <WiFi.h>
// Wi-Fi credentials
const char ssid = "your_wifi_ssid";
const char password = "your_wifi_password";
// IoT platform API endpoint
const char apiEndpoint = "https://your_iot_platform.com/api/data";
// HTC DM-98 pin connections
const int multimeterPin = 34; // Analog input pin for multimeter
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to Wi-Fi...");
  }
  Serial.println("Connected to Wi-Fi");
}
void loop() {
  int resistanceReading = analogRead(multimeterPin);
  float resistance = resistanceReading  (5.0 / 1023.0);
  Serial.print("Resistance: ");
  Serial.print(resistance);
  Serial.println(" k");
  
  // Send data to IoT platform using HTTP POST request
  WiFiClient client;
  HTTPClient http;
  http.begin(client, apiEndpoint);
  http.addHeader("Content-Type", "application/json");
  String postData = "{""sensor_data"": {""resistance"": ";
  postData += String(resistance);
  postData += "}}";
  int httpResponseCode = http.POST(postData);
  http.end();
  
  delay(30000); // Send data every 30 seconds
}
```
These examples demonstrate the versatility of the HTC DM-98 Digital Multimeter in various IoT applications, from simple voltage measurements to IoT-based sensor monitoring.