Sercel SN388 Installation Manual - 1.3.4 Peripheral Equipment

INTRODUCTION

CENTRAL CONTROL UNIT (CCU)

0311267

Issue : April 1998

1-8

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Minimum weight and volume.

For portable dynamite operations, the PAM houses all necessary

electronics to acquire 1200 Channels at 2-ms sample rate, within a 22-kg

unit (0.088 m3).

The APM which, in addition to acquisition itself, performs correlation and

stack operations, is packaged within a single 37-kg unit (0.111 m3), for

configurations up to 1200 Channels at 2-ms sample rate.

To facilitate configuration changes and equipment maintenance, the five

boards dedicated to acquisition and recording are identical and fully

interchangeable between the PAM and APM modules.

1.3.3 MULTI-MODULE INTERFACE

To extend the capacity of the system, an MMI-4 unit is used, allowing up to four

APM or PAM acquisition modules to be connected together (increasing the

capacity up to 4800 channels).

An MMC-4 unit is also available, to attach a camera to up to four acquisition

modules.

1.3.4 PERIPHERAL EQUIPMENT

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Tape drives

Reel or cartridge tapes can be used as magnetic media on SN 388 systems, for

recording in demultiplexed format :

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the MS8TT or SS8TT tape drive provides recording on a widely used 6250

b.p.i. 1/2 inch tape reel, housed in two waterproof and portable units,

specially designed for harsh and portable seismic environments.

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the CD 480 or 488 CARTRIDGE drive makes it possible to record a 3480

IBM compatible cartridge tape, directly in the field. For dual drive

recording, the standard software provides alternate or simultaneous

recording without any additional devices.

For very large configurations, parallel multiple drive recording makes it

possible to override the delay which may be induced by the speed

limitation of a single drive.

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Digital camera

An external digital camera is used to generate a paper record of the acquired

seismic data, either in read-after-write

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 or in play-back mode.

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 with MS8TT tape drive.