Maynuo M9812 DC Electronic Load 0-30A 0-150 V 300W
The Maynuo M9812 is a compact, high-precision programmable DC electronic load designed for professional testing of DC power supplies, batteries, adapters, LED drivers, and solar cells. It supports CC, CV, CR, and CW operating modes with fast dynamic response up to 25 kHz, a current slew rate of 2.5 A/µs, and dedicated LED test mode.
Overview
The Maynuo M9812B is a programmable DC electronic load with a dedicated LED test mode, purpose-built for testing LED drivers and LED power supplies. Alongside the LED function it offers the four standard operating modes — constant current (CC), constant voltage (CV), constant resistance (CR) and constant power (CW), plus combined CC+CV and CR+CV — with 0.1 mA / 1 mV resolution and up to 0.03% basic accuracy. It lets you qualify a real LED driver the way it behaves in the field, while still serving as a capable general-purpose load for power supplies, batteries and adapters.
A fast dynamic mode (up to 25 kHz, 2.5 A/µs) reproduces real-world transient and load-step conditions, while built-in battery-capacity testing, short-circuit simulation and automatic multi-step test sequences cover everyday R&D and production work. The M9812B is housed in a rugged 19-inch rack-mountable chassis with a bright VFD display, and can be fully remote-controlled over optional RS-232 / RS-485 / USB using the free PC software.
Key features
The LED test function
An ordinary electronic load in CC or CR mode often can’t test an LED driver reliably — many drivers detect that they aren’t driving a real LED and shut down or oscillate. The M9812B’s dedicated LED mode uses a special internal circuit to simulate the real voltage–current behaviour of an LED string, so the driver “sees” a genuine LED load and operates normally.
- Simulates real LED forward-voltage and dynamic-resistance behaviour.
- Compatible with capacitance-sensitive LED drivers that trip ordinary loads.
- Steady, stable readings throughout the test.
- One-touch: press Shift + ↑ to enter LED test — a “D” indicator appears on the display.
Operating modes
Specifications
| Maynuo M9812B — Technical specifications | |
|---|---|
| Max. power dissipation | 300W |
| Input voltage range | 0–500 V |
| Input current range | 0–15 A |
| Operating modes | CC / CV / CR / CW (+ CC+CV, CR+CV) + LED |
| LED test mode | Yes · simulates real LED-driver load |
| CC resolution / accuracy | 0.1 mA · 0.03% + 0.05% FS |
| CV resolution / accuracy | 1 mV · 0.03% + 0.02% FS |
| CR range | 0.3 Ω – 10 kΩ |
| CW (power) range | 0 – 300 W |
| Voltage measurement | 0–500 V · 0.015% + 0.03% FS |
| Current measurement | 0–15 A · 0.05% + 0.05% FS |
| Dynamic mode | 0 – 25 kHz · 2.5 A/µs |
| Battery test | capacity up to 999 Ah |
| Interfaces (optional) | RS-232 · RS-485 · USB · Modbus |
| Display | VFD (voltage / current / power) |
| Protection | OVP · OCP · OPP · OTP · reverse polarity |
| Dimensions (H×W×D) | 108 × 214 × 365 mm |
| Weight | 6.5 kg |
Downloads
What's in the box
- 1 × M9812B electronic load
- 1 × EU power cable
- 1 × English user manual
- 1 × CD-ROM with software
