AOC LM740 Specifications download pdf (Page 19)

Philips Fortimo HBMt Gen 3 System Design In Guide 19

Measurement of critical temperature point

It is important that the Tcase point is free of thermal interface material when the

thermo couple is connected for temperature measurements. It is essential to

have a stable connection between the thermal couple and the module. Any

shifting of the thermal couple will results in measurement errors and poor

measurement repeatability.

The temperature must be stable before any reliable data can be obtained

(depending on the size and material of the luminaire, between 30 and 180 minutes).

It is possible to measure the temperature in three different ways through a

thermocouple connected to the indicated Tcase point on the back of the module.

1. Preferred method: Via a groove in the module mounting surface:

2. Via an access point cut through the mounting surface of the module:

3. 40 gauge Thermocouple in-bedded inside of the module’s aluminum substrate:

40 gauge Thermocouple

Figure 20. Tcase measurement via an access point

Figure 19. Tcase measurement via thermocouple in a groove

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AOC LM740 Specifications Page 19