Maynuo M9812B DC Electronic Load 0-15A 0-500V 300W
The Maynuo M9812B is a compact, high-precision programmable DC electronic load designed for professional testing of high-voltage 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 up to 500 V.
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
