DT20 DC Meter

User Manual and APP Download

The DT20 DC Meter comes with comprehensive documentation and mobile application support for enhanced functionality.

• User Manual & PC Software: Download the user manual, PC software installation instructions, and PC software from: http://en.atorch.cn/upload/20240617105324.rar
• iOS APP: Search for "Smart Life" or "Tuya APP" on your phone's app store.
• Android APP: Search for "Smart Life" or "Tuya APP" on Google Play.

Built-in WiFi Module

The meter features a built-in WiFi module, enabling remote control. Connect the DT20 meter to a 2.4GHz Wi-Fi network to monitor and adjust settings via the mobile app from anywhere at any time.

Product Parameters

Key specifications and features of the DT20 DC Meter:

Voltage Range:

DC 0-420V (Requires DC5V independent power supply)

Capacity Range:

0-99999Ah

Current Range:

0~30A / 0.1~100A / 0.2~200A / 0.3~300A / 0.4~400A / 0.5~500A / 0.6~600A (optional)

Shunt Selection:

100A/200A/300A/400A/500A/600A (optional)

Relay Support:

Supports modification of circuits requiring additional relays for full charge and discharge, protecting the battery.

Alarm Functions:

Supports low-voltage, over-voltage, over-power prompts, or power outage notifications (when a 5V relay circuit is added).

Current Testing:

Supports bidirectional current testing. The direction of current is not distinguished after connection.

Attention: This product is a bidirectional current test meter. When discharging, the current displays a "-" symbol. When charging, it displays a "+" symbol. The capacity test is cumulative. To reset the capacity to zero, press and hold the "+" and "-" keys. Enter charging or discharging to test the capacity; the result will be the discharge capacity or charging capacity.

Display Interfaces

The DT20 DC Meter offers various display interfaces for different monitoring needs:

• Main Interface: Displays battery capacity and DC power detection.
• Alarm Interface: Shows alarm status and related parameters.
• Percentage Interface: Displays battery percentage and related data.
• Curve Interface: Visualizes voltage and current curves over time.
• Large Font Display Interface: Presents key readings in a larger, easily readable format.
• HID Online Interface: For connection and control via HID protocol.
• Bluetooth Online Interface: For wireless connection via Bluetooth.
• WIFI Online Interface: For wireless connection via Wi-Fi.

The device also features a Language Selection interface, supporting English and Chinese (语言选择: English, 中文). Users can navigate system settings for display brightness, standby settings, calibration, alarm prompts, and more.

Key Operation and Introduction

The DT20 DC Meter features a user-friendly interface with physical buttons and clear indicators.

Display Elements: Shows Voltage, Current, Power, Timing, Battery capacity (mAh), and Battery energy (Wh).The meter indicates battery status with a "+" symbol for charging and a "-" symbol for discharging.

Buttons:

• '+' Button: Used to switch pages or adjust values.
• 'Power' Button: Controls power to the device.
• 'M/OK' Button: Short press to set values or confirm, long press to enter the background system for settings.

Indicators:

• Power indicator light ?
• Connect indicator light ?

Ports:

• External Temperature probe connection ?️
• CPU Temperature sensor.
• Built-in WIFI module ?.
• USB independent Power interface (USB 5V) ?.
• DC5V relay interface.
• HID data communication interface (for PC/Bluetooth module/WiFi module connection).

Shunt Specifications: Supports various shunt capacities including 100A, 200A, 300A, 400A, 500A, and 600A (optional).

Curve Functions

The DT20 DC Meter provides advanced curve visualization capabilities for detailed analysis.

Charging and Discharging Curve and Peak Recording

The device offers a curve interface that simplifies querying voltage and current during battery power supply discharge processes. It displays curves along with peak and full-range peak recorded values, providing a clearer understanding of operating state wave amplitudes.

Voltage Current Curve Description

The voltage-current curve display includes controls for Pause/Run, and shows:

• Maximum voltage axis range.
• Maximum current axis range.
• Voltage curve (typically green) and Current curve (typically yellow).
• Voltage represented by each grid on the vertical axis.
• Current represented by each grid on the vertical axis.
• Time represented by each grid on the horizontal axis.
• Minimum values for voltage and current axes.
• Maximum values of recorded parameters (Cur Rec Max, All Rec Max).

Alarm Functions

The DT20 DC Meter features a double alarm system (sound and display) for critical conditions.

Double Alarm for Overvoltage, Lowvoltage, Overpower

By long-pressing the M/OK button, users can enter the backend system to set overvoltage, low-voltage, and overpower thresholds for the tested battery. The device then monitors these parameters in real-time. Upon reaching a set threshold, it displays alarm content and emits a beeping sound. This dual reminder helps users manage battery usage, especially when voltage is low, prompting timely charging to prevent depletion.

Specific alarm interfaces are available for:

• Over-voltage alarm interface: Displays voltage thresholds (e.g., <0120.05V).
• Low-voltage alarm interface: Displays voltage thresholds (e.g., >0002.50V).
• Over-power alarm interface: Displays power thresholds (e.g., <1000.50W).

Users can access background settings to change these thresholds.

Battery Level Percentage Color Change Display

The meter allows users to set high and low thresholds for real-time detection of charging and discharging control output. The percentage is calculated based on user-defined thresholds, and the battery symbol changes color to indicate the level:

• Green: Greater than 30%
• Yellow: Less than 30%
• Red: Less than 10%

When the display is within the 1% to 100% range, the power panel's red light illuminates, and the relay output provides a high level to connect the current path. If the value exceeds this range (e.g., over 100% or below 1%), the red light turns off, and the relay outputs a low level to disconnect the current path. This ensures safe charging and discharging protection, preventing battery damage from over- or under-charging. The system can also be used for over-voltage and low-voltage disconnection protection.

Connection Method

Accurate measurements are achieved using 4-wire wiring. The DT20 DC Meter is compatible with various battery types, including lead-acid, ternary lithium, and lithium iron phosphate, as long as they are within the 0-420V range.

Wiring Diagram Overview:

• Battery Connections: B+ and B- terminals for the battery.
• Voltage Sampling: Uses ordinary thin wires connected to the battery terminals.
• Power Supply: Requires a 5V USB power supply connected to the instrument power supply port.
• Relay Interface: For optional relay connection (5V Relay interface).
• Current Sampling: A bidirectional current sampler must be connected in series to the negative circuit of the battery. The sampler's input connects to the battery's negative electrode (B-), and the output connects to the meter's negative input (P-/C-).
• USB-HID Data Communication: Connects to a PC for data export.
• WiFi Module: Optional module for wireless connectivity.

Wiring Principle: Ensure all current flows through the bidirectional current sampler.

Warning: Use wires thick enough to handle the load's required current for optimal performance.

Adding Relays for Power-Off Function

Relay circuits can be added to the DT20 DC Meter to enable automatic power-off protection. This is useful during battery testing when fully charged or discharged, and for overvoltage, low-voltage, and power outage protection.

Connection Diagram: The diagram shows the battery connected to the meter, with a relay and a load.

Requirements:

• A relay (e.g., SONGLE SLA-05VDC-SL-A 5V 30A Relay) is required (additional purchase).
• The relay must be powered independently by 5V.
• The independent power supply for the relay cannot use the same circuit as the tested power supply.
• If the battery is charged, the input connects to a charger, and the output connects to a fully charged battery. The relay will automatically disconnect to protect against the risk of overcharging.

Note: It is recommended to purchase the relay along with DT20 series products.

Current Voltage Accuracy Evaluation

The precision of the DT20 DC Meter is rigorously calibrated by ATORCH engineers. Using innovative soft calibration technology and learning from large professional instruments, the meter achieves measurement precision comparable to high-end equipment. Small hardware errors are corrected via software.

The document includes comparisons showing the DT20's readings alongside those of professional instruments like the Monghui Programmable DC Power Supply PSP-6015A and BEICH CH9710C DC Electronic Load, demonstrating its accuracy.

APP WiFi Remote Control

The DT20 DC Meter supports remote control and testing via WiFi connectivity through the Smart Life or Tuya mobile applications.

APP Homepage Display

The app's homepage provides real-time data such as Voltage, Current, Power, Resistance, NTC Temperature, CPU Temperature, Total Capacity, and Total Energy. It also includes a switch for real-time data refresh (requires new firmware).

Graphic Display

The graphic display section allows users to view detailed curves:

• Voltage curve (hour meter)
• Current curve (hour meter)
• Power curve (hour meter)
• Energy curve (hour meter)
• Electric charge curve (hour meter)
• CPU temperature curve (hour meter)

App Settings

The app settings page allows configuration of:

• Device Language (English, Chinese)
• Display Brightness
• Standby Brightness
• Enter standby time
• Diverter size
• Overvoltage Protection (OVP) threshold
• Lowvoltage Protection (LVP) threshold
• Overpower Protection (OPP) threshold
• Over-temperature Protection (OTP) threshold
• System settings, Data Zero, Wi-Fi Reset, and Screen Rotation.

Online Computer Function

By installing the upper computer software and connecting the DT20 DC Meter to a computer via an HID data cable, users can access advanced features. The device is automatically recognized via the HID protocol, enabling rich curve functions, data measurement, and online control. Users can also export charging and discharging data and perform firmware updates for lifetime free upgrades.

The meter supports PC APP, Tuya APP, and Android APP. A Bluetooth module may be required for Bluetooth connectivity (additional purchase).

OTA Remote Firmware Upgrade

Firmware updates can be performed using an online cable connected to a computer. ATORCH engineers provide updates based on user needs, releasing new firmware for improved optimization and features. Users can purchase the device once and receive free lifetime upgrades. The process involves connecting the device to the computer and using the provided software to initiate the upgrade.

Product Parameters Summary

Product Name:

Battery capacity/DC power meter

Product Model:

DT20

Voltage Range:

0~420V (Requires 5V independent power supply)

Current Range:

0.1~100A / 0.2~200A / 0.3~300A / 0.4~400A / 0.5~500A / 0.6~600A

Capacity Range:

0~99999Ah

Curve Function:

Current voltage curve, with pause/run capability.

Optional Items: Introduction to Relays

Relays can be optionally purchased and connected to the DT20 DC Meter to enhance its functionality.

Key Functions Enabled by Relays:

• Realize the function of fully charging and power-off the battery.
• Enable power-off after discharging the battery.
• Implement overvoltage, low-voltage, and power outage protection functions.

Connecting Relay for Attention:

• When using a relay, it must be powered independently by 5V.
• The relay should be connected to the output positive pole.
• The independent power supply for the relay cannot use the same circuit as the tested power supply.
• If the battery is charged, the input connects to a charger, and the output connects to a fully charged battery. The relay will automatically disconnect to protect against the risk of overcharging.

Important Note: Please purchase this relay with DT20 series products. If purchased separately, refunds may be refused.