Sib Geofiz Pribor Ltd
2. Performance specifications
When measuring geophone (geophone string) specifications, the Tester pre-calculates
the rated value of any parameter to be measured and, based on this value, chooses the
test signal amplitude and the measuring channel parameters and, consequently, the
range of measurements. Therefore, the Tester performance specifications presented in
2.1 – 2.5 are valid provided the deviation of the measured quantity from its rated value
is no more than ±50%.
All performance specifications of the Tester are given for normal environmental
conditions.
2.1. Geophone natural frequency
Measurement range: 1.5 Hz to 100 Hz;
Relative measurement error: no more than ±1%;
Resolution: 0.01 Hz.
2.2. Geophone damping
Measurement range: 0.1 to 0.85;
Relative measurement error: no more than ±1.5%;
Resolution: 0.001
2.3. Geophone sensitivity
Measurement range: 0 to 6553.5 V/(m/s)*;
Relative measurement error: no more than ±2%;
Resolution: 0.1 V/(m/s).
*The sensitivity is calculated based on the results of measuring other geophone
parameters using the reference value of the geophone moving mass provided by the
geophone manufacturer.
2.4. Geophone coil electrical resistance
Measurement range: 0 to 65,535 Ohm;
Relative measurement error: no more than ±1%;
Resolution: 1 Ohm.
The electric resistance is determined by direct current measurement.
2.5. Geophone total harmonic distortion
Measurement range: 0 to 30%;
Absolute measurement error: no more than ±0.01%;
Resolution: 0.01%.
2.6. Geophone electrical impedance
Measurement range: 0 to 65,535 Ohm;
Resolution: 1 Ohm.
2.7. Geophone leakage resistance
Measurement range: 1 MΩ to 100 MΩ;
Relative measurement error: no more than ±5%;
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