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Our cesium-vapor magnetometers do not require periodic calibration in order to maintain the accuracy as described in our published specification when the instrument is operated within specified environmental ranges. Geometrics cesium-vapor magnetometers are manufactured and tested based on the discoveries and the basic designs of Carian Associates (U.S. Patent 3,071,721). This method of total magnetic field measurement relies upon the measurement of the optical absorption of a particular cesium spectral frequency by the cesium vapor enclosed in a small glass cell. This method is similar to those used in the measurement of atomic emission and absorption frequencies using spectroscopic reference cells. The technique thus relies on well-known fundamental quantum mechanical constants for accurate and precise measurement of the magnetic field. As a result, no adjustments to the sensor are needed in order to correct or maintain its accuracy and Geometrics sensor and sensor driver electronics are designed to either work correctly or to not work at all and to report both the strength of the magnetic field as well as the strength of the electrical signal produced by the working sensor. In this way, the signal strength measurement provides a direct indication of the operational state of the magnetometer while it is running and serves to alert the operator if the magnetometer encounters environmental conditions that are outside of its operating range. Occasional maintenance of the instrument at Geometrics facility should be performed when the instrument's internal diagnostics indicate substandard performance as described in the operator's manual. Please contact Geometrics Support for technical advice and additional information pertaining to your specific Model.

An issue that can be encountered with seismic work is when older geophones that are in your kit are no longer available. It is advised to not mix and match phones especially when doing reflection. It is the customer’s responsibility to determine if using the newer 4.5 Hz geophones with older 4.5 Hz geophones will work for their situation, site requirements, etc. When purchasing new geophones from Geometrics, check the response curve for the old geophones you have vs the new ones we sell. Model Information: 4.5 Hz Response Curve_13-105-030D is for the old phones with the discontinued element. GS-ONE LF 2450 specs_Vert_147-00198_[13-105-090D] is the current phones we sell. RTC-4.5hz-395-Spec-Curve_147-00155 [13-205-004.5D] Mixing geophones is not best practice, but they can be mixed so long as you understand the effect on the data when doing so. For surface wave and refraction surveys, it is OKAY, and not a big deal. When performing seismic reflection, mixing same frequency geophones with different response curves is not recommended. Even if not doing reflection, if the results of the data will potentially be used in court of law, or research uniformity is required, then all the geophones will need to be the same. Do your own research as ultimately the decision to either mix or not mix same frequency geophones with different response curves is up to you. Here are the 4.5 Hz geophone datasheets with response curve information: Geospace 4.5 Hz 380 Ohms Geophone datasheet (PN 13-105-030D) RT Clark 4.5 Hz 395 Ohms Geophone datasheet (PN 13-205-004.5D) Geospace 4.5 Hz GS-ONE LF 2450 Ohms Geophone datasheet (PN 13-105-090D) For more information please contact seismicsupport@geometrics.com