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Rcal (shunt) Resistor PF2310 Deflection Estimates
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These tables are used to estimate output values from the Ames SDS data
system for various settings of Rcal (shunt) resistors on the Precision Filters
2310 amplifier card.

Maximum value for PF2310 Vout is ±10.24 volts, also input limit of Preston A/D signal converters. In SDS Counts, maximum value is ±32767.


Equation 1: Rcal value (volts) = (gage resistance • exc • gain) / (gage resistance + 2 • rcal resistance) / 2

Balance Calibration Rcal Value


Equation 2: INCAL value (counts) = Rcal value in volts • 3200

Balance Calibration INCAL value

Download NASA Ames Rcal (shunt) Resistor Gage Resistance (MS Excel spreadsheet).


For Gage Resistance of 350 ohms

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

350 ohm Gage Resistance
 Gain = 512, 5 Volts Excitation
 
350 ohm Gage Resistance
 Gain = 512, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 2.731 1.398 4474   160,000 5.463 2.797 8950
140,800 3.103 1.589 5085   140,800 6.207 3.178 10170
120,800 3.616 1.852 5926   120,800 7.233 3.703 11850
100,600 4.341 2.223 7114   100,600 8.683 4.446 14227
80,600 5.416 2.773 8874   80,600 10.833 5.546 17747
60,200 7.246 3.710 11872   60,200 14.493 7.420 23744
50,200 8.685 4.447 14230   50,200 17.370 8.893 28458
40,200 10.836 5.548 17754   40,200 21.672 11.096 35507
30,000 14.499 7.423 23754   30,000 28.998 14.847 47510
20,000 21.685 11.103 35530   20,000 43.371 22.206 71058
10,000 42.998 22.015 70447   10,000 85.995 44.029 140894

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

350 ohm Gage Resistance
 Gain = 1024, 5 Volts Excitation
 
350 ohm Gage Resistance
 Gain = 1024, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 2.731 2.797 8950   160,000 5.463 5.594 17901
140,800 3.103 3.178 10170   140,800 6.207 6.356 20339
120,800 3.616 3.703 11850   120,800 7.233 7.406 23699
100,600 4.341 4.446 14227   100,600 8.683 8.891 28451
80,600 5.416 5.546 17747   80,600 10.833 11.093 35498
60,200 7.246 7.420 23744   60,200 14.493 14.841 47491
50,200 8.685 8.893 28458   50,200 17.370 17.787 56918
40,200 10.836 11.096 35507   40,200 21.672 22.192 71014
30,000 14.499 14.847 47510   30,000 28.998 29.693 95019
20,000 21.685 22.206 71058   20,000 43.371 44.411 142116
10,000 42.998 44.029 140894   10,000 85.995 88.059 281789

For Gage Resistance of 175 ohms

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

175 ohm Gage Resistance
 Gain = Gain = 512, 5 Volts Excitation
 
175 ohm Gage Resistance
 Gain = 512, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 1.366 0.700 2240   160,000 2.733 1.399 4477
140,800 1.553 0.795 2544   140,800 3.105 1.590 5088
120,800 1.810 0.926 2963   120,800 3.619 1.853 5930
100,600 2.173 1.112 3558   100,600 4.345 2.225 7120
80,600 2.711 1.388 4442   80,600 5.422 2.776 8883
60,200 3.628 1.858 5946   60,200 7.257 3.716 11891
50,200 4.350 2.227 7126   50,200 8.700 4.454 14253
40,200 5.430 2.780 8896   40,200 10.859 5.560 17792
30,000 7.270 3.722 11910   30,000 14.541 7.445 23824
20,000 10.890 5.576 17843   20,000 21.780 11.151 35683
10,000 21.685 11.103 35530   10,000 43.371 22.206 71058

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

175 ohm Gage Resistance
 Gain = 1024, 5 Volts Excitation
 
175 ohm Gage Resistance
  Gain = 1024, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 1.366 1.399 4477   160,000 2.733 2.798 8954
140,800 1.553 1.590 5088   140,800 3.105 3.180 10176
120,800 1.810 1.853 5930   120,800 3.619 3.706 11859
100,600 2.173 2.225 7120   100,600 4.345 4.449 14237
80,600 2.711 2.776 8883   80,600 5.422 5.552 17766
60,200 3.628 3.716 11891   60,200 7.257 7.431 23779
50,200 4.350 4.454 14253   50,200 8.700 8.909 28509
40,200 5.430 5.560 17792   40,200 10.859 11.120 35584
30,000 7.270 7.445 23824   30,000 14.541 14.890 47648
20,000 10.890 11.151 35683   20,000 21.780 22.302 71368
10,000 21.685 22.206 71058   10,000 43.371 44.411 142116

For Gage Resistance of 120 ohms

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

120 ohm Gage Resistance
 Gain = Gain = 512, 5 Volts Excitation
 
120 ohm Gage Resistance
 Gain = 512, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 0.937 0.480 1535   160,000 1.874 0.960 3071
140,800 1.065 0.545 1745   140,800 2.130 1.090 3489
120,800 1.241 0.635 2033   120,800 2.482 1.271 4067
100,600 1.490 0.763 2441   100,600 2.980 1.526 4883
80,600 1.860 0.952 3047   80,600 3.719 1.904 6094
60,200 2.489 1.274 4078   60,200 4.978 2.549 8157
50,200 2.984 1.528 4890   50,200 5.969 3.056 9780
40,200 3.726 1.908 6104   40,200 7.452 3.815 12209
30,000 4.990 2.555 8176   30,000 9.980 5.110 16351
20,000 7.478 3.829 12251   20,000 14.955 7.657 24502
10,000 14.911 7.634 24429   10,000 29.821 15.268 48859

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

120 ohm Gage Resistance
 Gain = 1024, 5 Volts Excitation
 
120 ohm Gage Resistance
 Gain = 1024, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 0.937 0.960 3071   160,000 1.874 1.919 6142
140,800 1.065 1.090 3489   140,800 2.130 2.181 6979
120,800 1.241 1.271 4067   120,800 2.482 2.542 8134
100,600 1.490 1.526 4883   100,600 2.980 3.052 9766
80,600 1.860 1.904 6094   80,600 3.719 3.809 12187
60,200 2.489 2.549 8157   60,200 4.978 5.098 16313
50,200 2.984 3.056 9780   50,200 5.969 6.112 19559
40,200 3.726 3.815 12209   40,200 7.452 7.630 24417
30,000 4.990 5.110 16351   30,000 9.980 10.220 32703
20,000 7.478 7.657 24502   20,000 14.955 15.314 49005
10,000 14.911 15.268 48859   10,000 29.821 30.537 97718

For Gage Resistance of 60 ohms

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

60 ohm Gage Resistance
 Gain = Gain = 512, 5 Volts Excitation
 
60 ohm Gage Resistance
 Gain = 512, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 0.469 0.240 768   160,000 0.937 0.480 1536
140,800 0.533 0.273 873   140,800 1.065 0.545 1745
120,800 0.621 0.318 1017   120,800 1.241 0.636 2034
100,600 0.745 0.382 1221   100,600 1.491 0.763 2442
80,600 0.930 0.476 1524   80,600 1.860 0.952 3048
60,200 1.245 0.638 2040   60,200 2.490 1.275 4080
50,200 1.493 0.764 2446   50,200 2.986 1.529 4893
40,200 1.864 0.955 3054   40,200 3.729 1.909 6109
30,000 2.498 1.279 4092   30,000 4.995 2.557 8184
20,000 3.744 1.917 6135   20,000 7.489 3.834 12270
10,000 7.478 3.829 12251   10,000 14.955 7.657 24502

Rcal value in Ohms, Gage Vout in mV, Amp Vout in Volts:

60 ohm Gage Resistance
 Gain = 1024, 5 Volts Excitation
 
60 ohm Gage Resistance
 Gain = 1024, 10 Volts Excitation
Rcal Value Gage Vout Amp Vout Counts   Rcal Value Gage Vout Amp Vout Counts
160,000 0.469 0.480 1536   160,000 0.937 0.960 3071
140,800 0.533 0.545 1745   140,800 1.065 1.091 3490
120,800 0.621 0.636 2034   120,800 1.241 1.271 4068
100,600 0.745 0.763 2442   100,600 1.491 1.526 4884
80,600 0.930 0.952 3048   80,600 1.860 1.905 6096
60,200 1.245 1.275 4080   60,200 2.490 2.550 8161
50,200 1.493 1.529 4893   50,200 2.986 3.058 9785
40,200 1.864 1.909 6109   40,200 3.729 3.818 12218
30,000 2.498 2.557 8184   30,000 4.995 5.115 16368
20,000 3.744 3.834 12270   20,000 7.489 7.668 24539
10,000 7.478 7.657 24502   10,000 14.955 15.314 49005


Rcal DIP switch arrangement PF2310 signal conditioning amplifiers

Balance Calibration Rcal switch



 

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Page Last Updated: December 30th, 2013
Page Editor: NASA Administrator