Alpes Lasers . TC-3 Manuel d'utilisateur télécharger pdf (Page 27)

TC-3 Temperature Controller User’s Manual · Page 27

Also unlike thermistors and RTDs, these IC sensors produce a linear

response, making conversion to temperature a very straightforward

calculation.

AD590 sensors produce 1µA/K, so that 0°C (which is equal to 273.15K)

would produce 273.15 µA.

Similarly, LM335 sensors produce 10mV/K, so that 0°C would produce

2.7315V.

For both sensors, because the response is linear, the sensor

coefficients default to a slope of 1 and an offset of zero, but can be

adjusted to achieve higher accuracy.

The temperature correction formula for the AD590 or LM335 is:

T = MT

+ B

Where T

is the temperature (in °C) calculated using the standard

conversion value of 1°C/µA or 0.1°C/mV, as appropriate, and adjusted

from Kelvin to Celsius.

External Fan Control

The TC-3 has a built-in user adjustable 4-12V DC power supply

designed to provide up to 350mA to an external fan. When using the

TC-3 with mounts that require a fan, no additional external power

supply is needed. The housings used by Alpes Lasers do not

incorporate fans.

Fan control is setup in the menu using the Ext Fan, Ext Fan Pwr, Ext

Fan Mode, and Ext Fan Off settings.

Ext Fan can be set to Off, Slow, Medium, Fast, or Custom. When set to

Off, the fan power is never turned on. Slow, Medium, and Fast

correspond to 9V, 10.5V, and 12V. To select a different voltage, choose

the Custom setting and then adjust the Ext Fan Pwr menu item to the

desired voltage, from 4.0V to 12.0V.

The fan on/off mode can be controlled using the Ext Fan Mode

setting. There are five modes:

Auto Fan is turned on whenever the TEC output is on, and turns off

when the TEC output is turned off.

On Fan is always on.

Delay Similar to the Auto mode, the fan is turned on whenever the

TEC output is on, but when the TEC is turned off, the fan will

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Alpes Lasers . TC-3 Manuel d'utilisateur Page 27