Applic Ations; Four Terminal Resistance Measurements - Time Electronics 1030 MicroCal Technical Manual

5. A pplic ations

5.1. Four Terminal Resistance Measurements

Accurate measurements of low ohm values, such as P.R.T, can be performed by using
the 1030 as a current source and measuring the voltage across the LOAD with a DVM.
From Ohms Law : V/I=R
Ω
°C
-200 18.48
-180 27.08
-160 35.53
-140 43.87
-120 52.11
-100 60.25
-80 68.33
-60 76.33
-40 84.27
-20 92.16
0 100.00
20 107.79
40 115.54
Using this technique, the current passed through to the resistor can be limited to a
known value, and lead resistance does not effect the accuracy of the readings.
1030 Technical Manual
10
Resistance vs Temperature Relationship for Platinum
Resistance Thermometer Detector Element (DIN 43760)
Ω
°C
60 123.24
80 130.89
100 138.50
120 146.06
140 153.58
160 161.04
180 166.46
200 175.84
220 183.17
240 190.45
260 197.69
280 204.88
300 212.02
P a g e | 10
Ω
°C
320 219.12
340 226.17
360 233.17
380 240.13
400 247.04
420 253.90
440 260.72
460 267.49
480 274.22
500 280.90
520 287.53
540 294.11
560 300.65
Ω
°C
580 307.15
600 313.59
620 319.99
640 326.35
660 332.66
680 338.92
700 345.13
720 351.30
740 357.42
760 363.50
780 369.53
800 375.51
820 381.45