<span style=" font-size:10pt;font-family:sans-serif">Ahoj Jano,</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">termistory sa
pouzivaju aj ako etalonove sondy - nahrada platiny. Su lacnejsie (relativne,
vid 5641B :) a maju vacsiu citlivost ale mensi teplotny rozsah. Dosiahnes
mK presnost.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Kedze sa presne
sondy pouzivaju hlavne v rozsahu teplot prostredia (aj vacsina tych relativne
lacnych teplomerov na doma) tak rozsah odporu nieje az taky extremny.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Pre 10k termistor
1M .. 1K pokryva teploty od -68 po 98 Celziovych.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Prepnutiu rozsahu
(aj prudovych zdrojov) sa nevyhnes pokial chces trochu presnejsie.
Pri takomto odpore nema zmysel komutacia, odpor je dost vysoky. Aj pri
malom prude bude napatie meratelne.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Na grafe je priebeh
T/R podla Steinhart-Hart, zratany na konkretnu sondu.</span>
<br>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Pre info, ceny
termistorov co sa pouzivaju v labakoch. posledny stlpec su sumy v Euro.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">2611
Thermistor Probe 420</span>
<br><span style=" font-size:10pt;font-family:sans-serif">1504-256
1 Channel Thermometer for Thermistors
2155</span>
<br><span style=" font-size:10pt;font-family:sans-serif">5610-6-B
Thermistor Probe, 1/8" x 6" Stainless
Steel 811</span>
<br><span style=" font-size:10pt;font-family:sans-serif">5611A-11-B
Secondary Reference Thermistor Probe, Silicone
Bead 594</span>
<br><span style=" font-size:10pt;font-family:sans-serif">5611T-B
Secondary Reference Thermistor Probe, Teflon
718</span>
<br><span style=" font-size:10pt;font-family:sans-serif">5640-B
Thermistor Standard Probe, 0 - 60 degC
1745</span>
<br><span style=" font-size:10pt;font-family:sans-serif">5641-B
Thermistor Standard Probe, 0 - 60 degC
2965</span>
<br><span style=" font-size:10pt;font-family:sans-serif">5643-B
Thermistor Standard Probe, 0 - 100 degC
2605</span>
<br>
<br><a href="https://www.elso.sk/teplotna-metrologia/hart-scientific-5641-standards-thermistor-probe-788.html"><span style=" font-size:10pt;color:blue;font-family:sans-serif">https://www.elso.sk/teplotna-metrologia/hart-scientific-5641-standards-thermistor-probe-788.html</span></a>
<br>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Maros.</span>
<br>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">></span>
<br><span style=" font-size:10pt;font-family:sans-serif">>Jan Waclawek
konfera na efton.sk</span>
<br><span style=" font-size:10pt;font-family:sans-serif">>Pondělí Leden
20 11:27:19 CET 2020</span>
<br><span style=" font-size:10pt;font-family:sans-serif">></span>
<br><span style=" font-size:10pt;font-family:sans-serif">>[preposielam]</span>
<br><span style=" font-size:10pt;font-family:sans-serif">></span>
<br><span style=" font-size:10pt;font-family:sans-serif">>Ahoj Marian,</span>
<br><span style=" font-size:10pt;font-family:sans-serif">></span>
<br><span style=" font-size:10pt;font-family:sans-serif">>chcel by vediet,
co je to to "presne merat"... Napr. ja by som v</span>
<br><span style=" font-size:10pt;font-family:sans-serif">>pripade termistora
rozdelil ulohu na dve ciastkove, jedna je meranie</span>
<br><span style=" font-size:10pt;font-family:sans-serif">>odporu a druha
transformacia odporu na teplotu. Kazda z nich ma svoje</span>
<br><span style=" font-size:10pt;font-family:sans-serif">>caro a svoje
finesy a viacero moznych rieseni.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">></span>