|
Sensor
|
Calibration pieces used
|
Acceptable departure
from full calibration
values
|
Sampling
interval
(cm)
|
Spatial
resolution
(cm)
|
|
Full calibration
|
Calibration check
|
|
Gamma density
|
Stepped Al/H2O (6, 5, 4, 3, 2, and 0 cm Al)
|
Distilled water
|
± 100 cps
|
1
|
0.5
|
|
P-wave velocity
|
Distilled water
|
Distilled water
|
± 1 µs
|
1
|
2
|
|
Noncontact resistivity
|
Saline fluids (35, 17.5, 8.75, 3.5, 1.75, and 0.35 g/L)
|
3.5 g/L saline fluid
|
± 10 mV
|
1
|
2
|
|
Magnetic susceptibility
|
Impregnated resin calibration piece
|
Impregnated resin calibration piece
|
± 5 SI
|
1
|
2–3
|