Optical Sensors / CS140 Calibrator

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Overview

The CS140 Calibrator is a high-quality device to generate a known luminance level for calibrating a CS140 Background Luminance Sensor. It is powered from the CS140 supply and is used while in communication with it.

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Technical Description

The calibration is made by using high-quality LEDs to produce a known light level, white, with a value of 4500 cd/m2. The light has a flat spectrum so the calibration is valid over the CIE spectrum sensitivity of the CS140 itself. The LEDs illuminate a diffuser, which itself illuminates the CS140 under calibration. An on/off switch turns off the LEDs and allows the unit to provide a zero check. Each unit is individually calibrated, and the value of luminance it produces is put on a label on the unit. This calibration is traceable, and this value is used in the calibration process.

Specifications

Generated light level About 4500 cdm‾² (individually calibrated)
Accuracy 5%
Operating temperature range 0 to 40°C
Dimensions (excluding cables) 72 mm long x 46 mm dia
Weight 300g approx
Communications RS 232, 38400 Bd communication with CS140 and laptop

Compatibility

The 34295 calibration device is only compatible with the CS140. Although the CS125 and CS120A have a similar device, these devices are not interchangeable.