R2T.hp42s

@ Convert 10 kOhm NTC resistance to temperature in °C
00 { 98-Byte Prgm }
01▸LBL "R2T"
02 10
03 ÷
04 LN
05 STO 00
06 3.3540154ᴇ-3
07 STO 01
08 2.5627725ᴇ-4
09 STO 02
10 2.082921ᴇ-6
11 STO 03
12 7.3003206ᴇ-8
13 STO 04
14 RCL 00
15 3
16 Y↑X
17 RCL× 04
18 RCL 00
19 X↑2
20 RCL× 03
21 +
22 RCL 00
23 RCL× 02
24 +
25 RCL+ 01
26 1/X
27 273.15
28 -
29 END

@ Conversion frontend for use with the solver application
00 { 39-Byte Prgm }
01▸LBL "T←→R"
02 MVAR "T/°C"
03 MVAR "R/Ohm"
04 RCL "R/Ohm"
05 XEQ "R2T"
06 RCL- "T/°C"
07 END