CCTL Mark II Subassembly Shipping Procedure Testing and Shipping Report. Page: 8 of 77
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The restoring force returns the seismic system to its original position and in turn
reduces or increases the output of the position-error detector until it reaches null.
The servo system would then be in a "force-balance" condition. The servo current
required to achieve this balance is directly proportional to the acceleration accord-
ing to the equation (Ma = F= Lis). Analog voltage output directly proportional to
the input acceleration is obtained by measuring the drop in current produced across
a known resistor (5).
The accelerometers used for this study produce an output voltage of
+15 volts/g and have a linear response from DC to 150 Hz.
The function of the Geo-Recon system is to provide the electronic balance
and supply +28 VDC to each servo accelerometer. The Geo-Recon systems are also equipped
with Century 409 oscillographs for recording the output over one minute intervals.
The oscillographs were used for periodic signal monitoring only.
All signal output from the accelerometers was recorded directly on a
Precision Instrument eight channel FM tape recorder operating at 1-7/8 ips. Outputs
from two of the triaxial accelerometers at a time were recorded on six channels,
WWV time signal on one channel and voice communication on one channel. This method
(using a tape recorder that has fixed heads with no mechanical resonance) provided
a wide latitude in the amount and type of data that was collected and also eliminated
any potential inaccuracies that could result from mechanical resonance of galvonometers
in an oscillograph recorder. The extent of analysis discussed in a later section of
this paper was possible only with magnetic tape recording of data.
Portable AC power was necessary to operate the tape recorder and to keep
a full charge on the batteries used to provide DC power to the accelerometers. Two
gas operated portable Honda AC-DC generators were mounted on the tractor with exten-
sion cords running back into the trailer. Each generator provided 300 Watts power
for a period of approximately four hours on one tank of fuel. Only one generator at
a time was required for operation of all systems.
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Edgar, J. B. & Tillson, D. D. CCTL Mark II Subassembly Shipping Procedure Testing and Shipping Report., report, January 1, 1971; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1033536/m1/8/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.