4-Channel Fully Isolated DC Voltage Current Power Data Acquisition Module

4-Channel Fully Isolated DIN Rail 100UA DC Power Signal Acquisition Module, Modbus RTU/TCP Transducer

Product Overview
This product is a real-time measurement and acquisition module for comprehensive collection of electrical parameters of 4-channel DC loads. It uses high-speed isolation devices to achieve isolation between signals in each channel. The signal measurement adopts a dedicated 24 bit high-precision true RMS measurement chip to measure effective value parameters such as current, voltage, power, and accumulated electricity. It has high accuracy, good stability, and fast sampling speed; Standard Modbus RTU protocol or Modbus TCP protocol. Widely used in production automation testing, computer room monitoring, product aging detection, etc.

Model Selection

Model	Measurement Function	Interface	Supply
JSH-44044-14N1	Four-circuit DC voltage, current, power and energy	RS485	9–30 V DC
JSH-44044-15N1	Four-circuit DC voltage, current, power and energy	RS485	9–57 V DC
JSH-44044-34N1	Four-circuit DC voltage, current, power and energy	Ethernet	9–30 V DC
JSH-44041-14N1	Four-channel DC voltage	RS485	9–30 V DC
JSH-44042-14N1	Four-channel DC current	RS485	9–30 V DC
JSH-44043-14N1	Four-channel DC voltage/current combination	RS485	9–30 V DC

Specify the required voltage and current ranges when ordering. For pulsating DC signals, request the corresponding M version and confirm the full model designation.
Product Features
1.Measurement of voltage, current, power, and accumulated power of 4-channel DC loads, which can be used for both AC and DC measurements;
2. Fast speed, 4-channel independent AD synchronous sampling, can complete data acquisition of all 4 electrical parameters in as little as 20ms;
3. High precision, using 24 bit AD sampling, dynamic range of 1000:1, and linear current range of up to 0.1%;
4.20mS、40mS、60mS、80mS、100mS、400mS、1000mS Seven adjustable collection speeds, which means completing the measurement of all electrical parameters within the set time;
5. It has both unipolar and bipolar measurement functions and can be selected for use;
6. High reliability, 4 channels are isolated from each other, power supply, communication and tested end are fully isolated, and the withstand voltage is greater than 2500V;
7. There are two options for setting the address and baud rate with a hardware dip switch, as well as software settings;
8. Optional network port communication, Modbus RTU protocol and Modbus TCP protocol are optional;
Technical Specification

Accuracy level	0.2%
Current range	100uA, 1mA, 20mA, 100mA, 1A, 5A, 10ADC, etc. can be customized (can measure uA level current)
Voltage range	75mV, 1V, 5V, 10V, 30V, 60V, 100V, 250V, 400V, 500V, 1000VDC, etc. can be customized
Input impedance	voltage channel>10 k Ω/V; current channel sampling voltage less than 0.15V
Overload capacity	1.2 times the range is sustainable and measurable; Instantaneous (<50mS) current 5 times, voltage 1.5 times the range without damage
Working temperature	-20 ℃ to+70 ℃
Frequency response	0-1000Hz (for AC/DC universal products)
Data collection update time	20mS, 40mS, 60mS, 80mS, 100mS (default), 400MS, 1000MS can be set Note: When the input is an AC signal with a frequency other than 50Hz, the sampling speed needs to be adjusted to 400mS.
Isolation withstand voltage	>2500V DC; Equipped with surge protection
Auxiliary power supply	+9V~30V or+9V~57V
Rated power consumption	<1W (typical 24V power supply 30mA)
Output interface	RS485 (Modbus RTU communication protocol) or Ethernet port (Modbus TCP communication protocol)
Data output	4-channel DC voltage, current, power, cumulative power (AC measurable power factor)
Communication baud rates	4800, 9600, 19200, 38400, 57600, 115200 bps; (Can be set up through software or hardware)
Data format	no parity/odd parity/even parity, 8 data bits, 1 stop bit Or special method: no verification, 8 data bits, 2 stop bits (the 9th bit can be set to 1 or 0)
Installation method	35mm rail installation; Appearance size: 115X90X40 mm

Note: This product defaults to software modification at the factory, with parameters including Address 1, baud rate 9600, no checksum, 8 data bits, and 1 stop bit

Applications
1.DC Load Testing
Measure the operating voltage, current, power and accumulated energy of up to four DC loads. A connected host can record readings and compare load behavior during test sequences.

2.Automated Production Inspection
Integrate electrical measurements into production test equipment. Select the voltage and current ranges to match the devices under test and use the host system to apply acceptance limits.

3.Product Burn-In Testing
Monitor electrical performance during extended operating tests. Isolated channels support separate measurement circuits, subject to the module’s specified electrical limits.

4.Equipment Room Monitoring
Collect operating data from compatible DC equipment circuits and transmit readings to a supervisory system through RS485 or Ethernet.

Why Choose Us
1.True Industrial-Grade Isolation:
Complete galvanic isolation (more than 2500V) across all channels and ports eliminates ground loops and protects expensive downstream PLC/SCADA control systems.
2.High-Speed Simultaneous Sampling:
Independent AD converters per channel capture rapid transients in as fast as 20ms, avoiding the blind spots of multiplexed scanning meters.
3.Flexible Integration & Protocols:
Native support for standard Modbus-RTU (RS485) and Modbus-TCP (Ethernet) ensures seamless plug-and-play integration with third-party software and PLCs.
4.Robust & Reliable Hardware:
Engineered for harsh industrial environments with a wide operating temperature range (-40 to +70) and dual configuration modes (hardware DIP switch & software).
FAQ
1. What does the JSH-44044 measure?
It measures voltage, current, power and accumulated energy for four DC circuits. Other models in the series provide voltage-only, current-only or voltage/current combination functions.

2. Are the four measurement channels isolated?
Yes. The four channels are isolated from one another, with additional isolation between the measurement inputs, power supply and communication sections.

3. Does it use pass-through current sensors?
No. Current is measured through terminal connections in the load’s negative return path. Follow the wiring diagram for the supplied model.

4. What is the fastest measurement update interval?
The specified minimum update interval is 20 ms. Other settings are 40, 60, 80, 100, 400 and 1000 ms. Host retrieval time also depends on communication settings and polling.

5. Can the measurement range be changed through software?
Order the module with the required input ranges. Do not assume that changing a range-related register changes the physical input range or hardware configuration.

6. Can it measure pulsating DC or AC signals?
Pulsating DC requires the corresponding M version specified in the manual. AC/DC universal measurement requires confirmation of the appropriate configuration. Power factor measurement is an optional function and is not included in the standard product.