Multicomp Pro MP71025B DC Electronic Load User Manual

1. Introduction

The Multicomp Pro MP71025B is a single-channel programmable DC electronic load designed for a wide range of applications, including middle and high-end testing scenarios. This device facilitates precise online voltage measurement and adjustments, and can simulate various test conditions such as short circuits. Its user-friendly interface, featuring a simple keypad on the front panel, ensures ease of operation.

Key features include:

• Multiple test functions: Battery test, automatic test, Over Power Protection (OPP) test, Over Current Protection (OCP) test, Remote sensing, Short Circuit, Current monitoring, and Power-off memory.
• Dynamic mode operation up to 10KHz.
• High resolution for voltage and current measurements: 0.1mV/0.1mA.
• Four primary working modes: Constant Voltage (CV), Constant Current (CC), Constant Resistance (CR), and Constant Power (CW).
• Remote sensing function for accurate voltage measurement at the load.
• Short circuit function for simulating fault conditions.
• Current monitoring capability.
• Power-off memory function to retain settings.
• Storage for up to 100 sets of user-defined parameters.
• Connectivity options: USB, RS232, and LAN interfaces.

2. Product Overview

Figure 2.1: Front view of the MP71025B DC Electronic Load, showing the display, control buttons, and rotary encoders.

Figure 2.2: Detailed view of the front panel, highlighting the digital display, function keys (Esc, M1-M5, Call, Shift), numeric keypad, and mode selection buttons (CC, CV, CR, CW).

Figure 2.3: Rear panel of the MP71025B, showing the AC input, fuse holder, voltage selector switch, remote sensing terminals, LAN, USB, and RS232 ports.

Figure 2.4: The MP71025B unit displayed with its standard accessories, including power cables, USB cable, RS232 cable, and a software CD.

3. Setup

3.1 Unpacking and Inspection

Carefully unpack the electronic load and its accessories. Verify that all components listed in the packing list are present and undamaged. If any items are missing or damaged, contact your supplier immediately.

3.2 Power Connection

1. Ensure the power switch on the rear panel is in the OFF position.
2. Verify the AC input voltage selector switch on the rear panel matches your local mains voltage (110V or 220V). Adjust if necessary.
3. Connect the supplied AC power cord to the AC INPUT receptacle on the rear panel (refer to Figure 2.3).
4. Plug the other end of the power cord into a grounded AC power outlet.

3.3 Load Connection

Connect the device under test (DUT) to the input terminals on the front panel. Ensure correct polarity: connect the positive (+) terminal of the DUT to the positive (+) input of the electronic load, and the negative (-) terminal of the DUT to the negative (-) input of the electronic load.

For applications requiring high accuracy, especially with long connection cables, utilize the remote sensing terminals on the rear panel (refer to Figure 2.3). Connect the remote sensing wires directly to the DUT's output terminals to compensate for voltage drop across the load cables.

3.4 Communication Interfaces

The MP71025B supports USB, RS232, and LAN communication. Connect the appropriate cable from the electronic load's rear panel to your computer or network device for remote control and data logging. Install the necessary drivers and software provided on the included CD or available from the manufacturer's website.

4. Operating Instructions

4.1 Basic Operation

1. Turn on the power switch on the rear panel. The display will illuminate.
2. Press the POWER button on the front panel to activate the load.
3. Select the desired operating mode (CC, CV, CR, CW) using the dedicated buttons on the front panel.
4. Use the rotary encoders or the numeric keypad to set the desired load parameters (e.g., current in CC mode, voltage in CV mode).
5. Press Enter to confirm the setting.

4.2 Operating Modes

• Constant Current (CC) Mode: The load draws a constant current regardless of the input voltage. Ideal for battery discharge testing.
• Constant Voltage (CV) Mode: The load maintains a constant voltage across its terminals by adjusting the current drawn. Useful for power supply testing.
• Constant Resistance (CR) Mode: The load simulates a constant resistance. The current drawn is proportional to the input voltage.
• Constant Power (CW) Mode: The load draws a constant power, meaning the product of voltage and current remains constant.

4.3 Advanced Functions

• Battery Test: Use this function to perform automated battery discharge tests. Refer to the detailed programming guide for setting up test parameters like discharge current, cut-off voltage, and duration.
• Dynamic Mode: Simulate transient load conditions with adjustable frequency and duty cycle up to 10KHz. Press the DYNAMIC button to access these settings.
• Short Circuit Test: Activate the short circuit function to test the DUT's response to a short circuit condition.
• Memory Functions (M1-M5, Save, Call): Store and recall up to 100 sets of frequently used test parameters. Use the SAVE button to store current settings and CALL to retrieve them.
• Protection Functions (OPP, OCP): The unit includes built-in Over Power Protection and Over Current Protection to safeguard both the load and the DUT.

5. Maintenance

To ensure the longevity and optimal performance of your Multicomp Pro MP71025B DC Electronic Load, follow these maintenance guidelines:

• Keep the unit clean and free from dust. Use a soft, dry cloth for cleaning the exterior. Do not use abrasive cleaners or solvents.
• Ensure proper ventilation. Do not block the ventilation openings on the sides and rear of the unit (refer to Figure 2.5 and 2.6).
• Regularly check power cords and connection cables for any signs of damage. Replace damaged cables immediately.
• The internal fuse is user-replaceable. If the unit does not power on, check the fuse located near the AC input on the rear panel. Ensure to replace it with a fuse of the same type and rating (refer to the specifications).
• Avoid operating the unit in environments with excessive humidity, extreme temperatures, or corrosive gases.

Figure 2.5: Side view of the MP71025B, illustrating the ventilation grilles essential for heat dissipation.

Figure 2.6: Angled rear view, providing another perspective on the ventilation slots and rear panel connections.

6. Troubleshooting

This section provides solutions to common issues you might encounter with the Multicomp Pro MP71025B DC Electronic Load. If the problem persists after attempting these solutions, please contact technical support.

7. Specifications

8. Warranty Information

This Multicomp Pro product is covered by a standard manufacturer's warranty. Please refer to the warranty card included with your product or visit the official Multicomp Pro website for detailed terms and conditions regarding warranty coverage, duration, and claims procedures. Keep your proof of purchase for warranty validation.

9. Technical Support

For technical assistance, troubleshooting beyond this manual, or inquiries regarding your Multicomp Pro MP71025B DC Electronic Load, please contact Multicomp Pro customer support. You can find contact information and additional resources on the official Multicomp Pro store page:

Visit Multicomp Pro Store