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6. DATA REDUCTION
Table 3 shows the readout position, theoretical gage factors, and experimental data derived from
batch calibrations for each model of strain gage. (Individual calibrations are available at an
additional cost; contact Geokon for more information.)
Model:
Readout
Position:
Theoretical
Gage Factor:
Typical Batch
Factor
Typical Gage
1
Factor
Experimental
Data:
1
The exact Gage Factor is determined by actual calibration, there is no Batch Factor to apply.
6.1 Readout Box Position A
Model 4204 must be read in position A (choose digits mode on the GK-404). On the GK-403 and
GK-405, the readout is the period, which then must be converted to digits using the formula:
6.2 Readout Box Position B
For gages read in Position B, gage factors must be applied to the change in readings. These gage
factors are either average gage factors for that batch of gages, or gage factors from individual
calibrations.
4200
4202
D
E
3.304
0.391
0.97 to
0.91
0.98
N/A
N/A
3.237
0.356
Table 3 - Embedment Strain Gage Factors
Digits=
Equation 1 - Period to Digits Conversion
4204
4210
A
B
N/A
N/A
N/A
N/A
1.422
0.3568
0.3624
N/A
0.3423
2
Hz
1000
4212
4214
B
B
N/A
N/A
N/A
N/A
0.3665
N/A
N/A
15
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