Temperature Sensor for 4 Kelvin

[archiees]

Hi ,
I need to do some gain measurements of my MESFET amplifier at around 4 Kelvin. To measure the temperature I was hoping to buy Silicon diodes from Lakeshore - just realized that they are very expensive ($500 bucks for the calibrated ones). Is there a way i can rig up something in the lab without spending half a grand.
I need to go from aounrd 77 K to 4K with +/- 1 Kelvin error.

 

[VSMVDD]

cant you buy a cheeper probe made in china

you could also rig up a d-a converter run from an mcu to supply the voltage instead

converting it to current is easy if needed

 

[archiees]

Please,
can you tell me more? What kind and do you have alink to the specs?

 

[VSMVDD]

if it uses an a-d just use the same resolution of d-a to supply

**broken link removed**

here is a page i found has some code
{nice and easy in picbasic or something }
use an lcd

or use c language there is lots of free compilers around

 

[archiees]

The lower limit of these sensors is greater than 4 kelvin which is equal to -269 degree celcius. I need to something that will go to that cryogenic temperautres.