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Optional Geophone Element Specifications

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Содержание BHG-2

Страница 1: ...ne Controller BHGC 4 Geophone Controller BHGC Rechargeable Battery Option Operation Manual Geostuff www Geostuff com info geostuff com Sales Geostuff 12996 Somerset Drive Grass Valley CA 95945 U S A phone 530 274 4445 fax 530 274 4446 Service Geostuff 1579 Lupine Lane Lincoln CA 95648 U S A phone 916 258 1090 ...

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Страница 3: ...echanism will operate very slowly or not at all o The BHG 3 compass mechanism must be correctly positioned for proper operationC Read the directions If the mark on the compass housing is aligned with the clamp spring the longitudinal compass will point towards magnetic North If the housing is rotated the geophone can be adjusted to point to a different direction o Do not apply more than 36 volts t...

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Страница 5: ...ws either BHG to operate in very large boreholes The cable includes a waterproof connector on the wet end high strength copperweld conductors and a Kevlar braid for additional strength beneath a Polyurethane jacket The cable is also available as an extension cable with waterproof connectors on each end to provide a temporarily longer cable A multi takeout cable is available to create Astrings of b...

Страница 6: ...annel 12 or 13 on a 24 channel seismograph The Longitudinal geophone will be connected to pins 3 4 and the Transverse geophone will be connected to pins 5 6 The Longitudinal geophone points toward the clamp spring To operate the clamp mechanism without a controller apply a DC voltage directly to pins 1 2 of the connector If the positive terminal is connected to pin 1 and the negative to pin 2 the ...

Страница 7: ...oles and it can be omitted in cased holes See the illustration in this manual for the proper installation of the kit The standard geophone elements are OYO Geospace type GSC 20DM Omni 15 Hz natural frequency with a 2400 ohm coil 10 14 28 and 40 Hz elements are also available Specifications for the geophone elements are included in this manual The geophone elements can be field replaced by any reas...

Страница 8: ...er is applied to pins 3 red and 4 black The process is automaticC just position the geophone at its desired depth and clamp the geophone in the hole Then apply power to pins 3 and 4 The positive voltage must go to pin 3 and should be between 15 and 36 volts DC The mechanism will draw some current for a few seconds while the geophone is rotated then the current will drop off sometimes the current w...

Страница 9: ...eophone elements The internal mechanism of the BHG 3 rotates the geophone one revolution When the body of the geophone is rotated a point is reached where the mechanism stops tracking the compass and instead reverses itself makes a full turn in the other direction and re synchronizes with the compass If you turn the geophone assembly slowly and listen you can hear this happen as the motor will run...

Страница 10: ...power to the clamp motor which will collapse the spring and loosen the geophone in the borehole RECORD This position is used to record seismic data This is also the off position since it is the only position which does not power the geophone motors Always keep this switch in the RECORD position except when intentionally operating one of the motors CLAMP Switches power to the clamp motor which will...

Страница 11: ...place in the borehole When there is no load on the spring the current with be 1 3 to 1 2 amp depending on brand of motor used You may see pulsations as the motor turns indicating the revolution rate As the spring starts to compress against the side of the borehole the current will increase to perhaps 1 amp This will be your clue that the geophone is clamped in the borehole Stop the motor at this p...

Страница 12: ...r into the power source before connecting the output leads to the controller The green LED light indicates that the power is on Then connect the charger leads to the External Power binding posts matching the colors between the clips and the binding posts After the battery has been connected to the charger the red LED will light up and the green LED will go off This indicates that the charger has g...

Страница 13: ...eel threads should have a small amount of anti seize compound applied to prevent the connectors from Agalling together The system is normally wired as follows Wire BHG Color Pin No Function White 1 Vertical geophone and motor power Yellow 2 Verterical geophone B and motor power Red 3 Longitudinal geophone and orientation mechanism power Black 4 Longitudinal geophone B and orientation mechanism pow...

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Страница 15: ...than the other pins patch around a defective conductor To use it it is necessary to re wire the dry end connector and the inside of the tool The spare wire is green and can be connected in parallel with the defective conductor Geophone Signal Problems If one or more of the geophone signals is missing or noisy they can usually be checked with a common ohmmeter The standard 15 Hz geophones have a co...

Страница 16: ...Schematic for a user constructed controller for a BHG 2 geophone ...

Страница 17: ...Schematic for a user constructed controller for a BHG 3 geophone ...

Страница 18: ...BHG 2 Component View ...

Страница 19: ...BHG 3 Component View ...

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Страница 24: ...Standard Geophone Element Specifications ...

Страница 25: ...Optional Geophone Element Specifications ...

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