Coil and shunt resistance values affect the sensitivity, damping and pole values. To calculate poles, zeros and sensitivities for L-4As built with other resistor values, click here.

These responses assume that the input resistance of the attached amplifier or datalogger is at least 2 orders of magnitude larger than the shunt resistor. If this is not the case, total damping will not be 70% and the poles will not describe the system accurately.

Manufacturer |
Model |
Frequency / Period |
Coil Resistance |
Shunt Resistance |
Sensitivity |
RESP Filename |
Source |
Comments |

Sercel | L-4A | 2 Hz / 0.5 s | 500 Ohms | 810 Ohms | 51.5 V/M/S | RESP.XX.NS150..SHZ.L4A.500.810.2.51_5 | Sercel | |

Sercel | L-4A | 2 Hz / 0.5 s | 2000 Ohms | 3238 Ohms | 102 V/M/S | RESP.XX.NS151..SHZ.L4A.2000.3238.2.102 | Sercel | |

Sercel | L-4A | 2 Hz / 0.5 s | 5500 Ohms | 8905 Ohms | 171 V/M/S | RESP.XX.NS152..SHZ.L4A.5500.8905.2.171 | Sercel |

*Mary Templeton 3/7/2013*