Screen luminance meter LUTRON LM-4000SD

Product detailed description

The LM‑4000SD is a compact, impact‑resistant luminance meter designed for accurate measurement of screen brightness using a silicon photodiode sensor and human‑vision‑matched response. It offers a wide measurement range, real‑time SD logging and PC connectivity for laboratory, industrial and service applications.

Key Features
Wide luminance range: 0.01 to 39,990 cd/m²
(citace: “Wide measuring range: 0.01 ~ 39990 cd/m2.”)

20 mm measuring spot for precise readings on displays and light sources
(citace: “Small measuring light spot, diameter 20 mm… target diameter should be greater than 20 mm.”)

≤1 m measuring distance, tilt angle <5°

High repeatability and reliability with data hold and peak hold
(citace: “Digital display with excellent repeatability and reliability, featuring data hold and peak hold functions.”)

Real‑time SD card datalogger (1–3600 s sampling, manual mode with 1–99 positions)
(citace: “SD memory card… Auto 2 to 3600 seconds… Manual mode… select the 1 to 99 position.”)

RS232/USB PC interface for data acquisition
(citace: “Data Output: RS232/USB PC computer interface.”)

Low power consumption: up to 100 hours on 9V battery
(citace: “Low power consumption… continuous operation for up to 100 hours.”)

Auto power‑off, clock/calendar, decimal point setting, SD card formatting

Compact and lightweight: 244 g, 177 × 68 × 45 mm
(citace: “Weight 244 g… Dimension 177 x 68 x 45 mm.”)

Technical Specifications
Sensor: Silicon photodiode

Resolution: 0.01 / 0.1 / 1 cd/m²

Accuracy: ±3% + 5 digits (after calibration)
(citace: “Accuracy (23±5 ℃): ± 3.0 % + 5 d (After Calibrater.)”)

Operating conditions: −20 to +50 °C, <85% RH

Power: 6× AA batteries or optional AC/DC adapter

Optional accessories: SD card, USB/RS232 cables, software, carrying cases

Documents:

• Datasheet