CENR  55-2 
Volume  XII 
OPERATIONAL  PROCEDURES  FOR  GLOBAL  SUBSURFACE  SYSTEM  (GSS) 
FIELD  DATA  ACQUISITION  (FDA)  LOCATIONS 
14  November  1986
CENTER  REGULATION  55-2 
Volume  XII 
14  November  1S36 
Operations 
OPERATIONAL  PROCEDURES  FOR  GLOBAL  SUBSURFACE  SYSTLM  (GSS) 
FIELD  DATA  ACQUISITION  (FDA)  LOCATIONS 
This  regulation  establishes  the  procedures  for  performing  standard  operations  and  analysis 
functions  at  GSS  FDA  stations.  This  regulation  is  to  be  used  in  conjunction  with  CENR  55-2  Vol 
I  and  addresses  instructions  for  the  GSS  FDA  locations  only.  Instructions  to  alter  any 
requirements  of  this  regulation  from  any  source  other  than  Headquarters/DO  will  not  be  imple- 
mented until  approved  by  Headquarters/DOSB. 
1.  General: 
a.  Data  Channel  Designator.  In  order  to  differentiate  the  GSS  FDA  channels  from  the 
existing  channels,  the  following  changes  to  the  Frequency  Response  section  *>f  the  channel 
designator  system  described  in  Volume  I  are   required: 
(1)  Short  Period.  The  number  2  will  be  used  at  FDA  stations  using  239UC  in*   :'.^36000 
instruments. 
(2)  Long  Period.  The  number  5  will  be  used  at  FDA  stations  using  KS36000 
instrument(s). 
b.  Operations  Room  Environment: 
(1)  The  normal  operating  tolerances  are  50-90  degrees  Fahrenheit  and  10-80%  humidity. 
(2)  Should  the  temperature  exceed  90  degrees  Fahrenheit  or  humidity  fall  below  10%, 
power  the  CT  down  to  preclude  equipment  damage. 
c.  Power.  The  CT  will  be  operated  within  specifications  contained  in  TI  2-CT-l. 
d.  Operations  Area: 
(1)  No  magnet  or  radio  will  be  brought  within  3  feet  of  the  CT  at  any  time. 
(2)  Containers  of  photographic  chemicals  will  not  be  placed  on  the  MOT  table. 
2.  Operation  Procedures. 
a.  Summation  Channel  Operations.  Individual  vertical  array  channel (s)  may  be  deleted  from 
the  STPR,  using  the  Channel  Use  commands,  whenever  channel  state-of-heal th  is  in  question,  and 
during  maintenance  actions  to  preclude  spurious  spikes  and/or  offsets  from  affecting  the  sum- 
mation. Individual  channeKs)  will  not  be  deleted  from  processed  traces  because  of  cultural  or 
wind  noise. 
b.  Outages  Authorized  for  Training  Purposes.  The  Specific  Station  Requirement  details 
each  station's  authorized  training  time.  An  analysis  capability  must  be  maintained  (i.e., 
individual  high  gain  vertical,  infinite  velocity  beam  )  either  on  site  or  at  the  headquarters. 
If  an  analysis  capability  cannot  be  maintained  (i.e.  the  CT  or  CPU1  (and  CPU2  for  high-speed 
stations)  will  be  inoperative),  transmit  a  request  for  outage  using  the  criteria  established  in 
Volume  I,  paragraph  2-6.  This  requirement  is  to  ensure  the  headquarters  is  informed  of  any 
impending  loss  of  data  from  that  station  and  can  approve  or  disapprove  the  outage  as  dictated 
by  mission  requirements. 
3.  Software  Changes/Control.  Centralized  control  of  all  FDA  software  and  supportive  documen- 
tation is  the  responsibility  of  Depot/LG.  All  procedures  for  using  and  maintaining  the  soft- 
ware supporting  the  FDA  (CT  and  RTs)  will  be  provided  to  the  detachment  maintenance  personnel 
by  Depot/LG. 
4.  Recording  Procedures: 
a.     Oevelocorder  Timing.     In  order  to  provide  the  correct  time  output  to  the  develocorders 
(compensating  for  the  CT  and  RT  processing  delays)  the  DATACHRON  timers  will  be  retarded  37.001 
seconds  from  GMT  (ZULU). 
Mo.  of  Printed  Pages:     9 
OPR:     DOSB 
Distribution:     X
2  CENR  55-2,  Vol  XII   14  November  1986 
b.  Real  Time   Visual  Recorder(RTVR) .   The  RTVR  will  be  used  for  signal  monitoring,  equip- 
ment checks  and  data  reporting  (by  use  of  the  eight  CT  analog  channels)  during  periods  of  deve- 
locorder  or  CPU1  outages.  When  used  for  data  reporting,  a  sensitivity  check  will  be 
accomplished  to  verify  channel  gain. 
c.  Station  Processor.  The  STPR  will  record  all  channels  supplied  by  the  CT  and  processed 
traces  on  a  continuous  basis.  When  CPU1  is  anticipated  to  be  inoperative  in  excess  of  eight 
hours,  and  a  spare  is  not  available,   CPU1  and  CPU2  will  be  physically  interchanged,  by  main- 
tenance personnel,  to  maintain  data  processing  and  signal  outputs  to  the  develocorders.  CPU1 
and  CPU2  will  not  be  physically  interchanged  when  CPU2  is  inoperative. 
5.  Calibrations  and  Operating  Tolerances.  All  data  channel  calibrations  (EQUATE,  SSITE,  FREQ 
RESP)  will  be  performed  using  the  CT  and  the  amplitude  factor   specified  in  the  SSR  (for  ampli- 
tude factor  to  millimicron  conversion,  reference  attachment  1).  The  STPR  will  be  used  for 
channel  sensitivity  checks. 
a.  When  an  array  channel  must  be  removed  from  the  STPR  input,  the  Channel  Use  command  will 
be  used,  ^hich   will  automatically  adjust  the  processed  data  gains  to  compensate  for  the  removed 
channel (s).  Following  maintenance,  and  after  the  maintenance  personnel  have  verified  the 
correct  operation  and  tolerance  of  the  channel  (CT  SSITE  cal),  add  the  channel  to  the  STPR  with 
the  Channel  Use  command.  Additionally,  because  the  CT  automatically  equalizes  all  channels, 
STPR  CGAINS  are  not  changed  from  the  values  entered  at  configuration  (when  the  initialized 
operational  program  is  constructed,  the  CGAIM  for  each  channel  is  included). 
b.  Develocorder  Sensitivity  Checks.  Develocorder  sensitivity  checks  will  be  performed  on 
all  display  channels  using  the  Assign  command  at  CPU1  and  the  values  specified  in  the  SSR. 
c.  Calibration  Schedule: 
(1)  Each  CT  channel   is  required  to  be  calibrated  each   Wednesday  at  the  time  specified 
in  the  SSR.  When  a  CT  calibration  with  channel  analysis  (parameter  2  equals  SA  or  EQ)  is  per- 
formed, and  results  are  not  within  CT  tolerances  (i.e.,  scale  factor  not  replaced),  delete  the 
channel  from  processing  (if  contributing  to  a  summation)  and/or  record  the  channel  as  unknown 
(if  individual  display  channel)  until  maintenance  personnel  can  verify  the  correct  operation  of 
the  suspect  channel . 
(2)  Develocorder  sensitivity  checks  will  be  performed  on  each  display  channel  during 
the  first  and  third  week  of  every  month.  Develocorder  sensitivity  checks  may  be  performed  at  a 
date  and  time  convenient  to  the  location. 
(3)  Frequency  responses  will  be  performed,  the  values  normalized,  and  the  results  com- 
pared to  established  tolerances  in  January,  April,  July  and  October.  Frequency  responses  are 
not  required  to  be  recorded  on  film.  The  quarterly  or  final  frequency  response  MOT  printer 
printouts  (analysis  results  table)  will  be  forwarded  in  accordance  with  paragraph  8. 
d.  Unscheduled  Checks  and  Calibrations: 
(1)  Frequency  Response  -  Required  whenever  components  affecting  data  response  curve 
characteristics  are  adjusted  or  replaced  to  include  sensor  repair,  free  period  or  damping 
adjustments,  and/or  RT  replacement. 
(2)  SSITE  CAL  with  scale  replacement  (SA)  -  Required  to  determine  correct  channel 
operations  following  maintenance  action,  and  before  channel  is  added  to  summation  traces  (for 
array  channels)  or  determined  to  be  at  known  gain  (for  individual  channels). 
(3)  Stations  will  perform  unscheduled  calibrations  whenever  channel  malfunctions 
affecting  data   reliability  are  suspected.     Remove  from  the  STPR,  any  suspect  channels  contri- 
buting to  summation  traces  (for  array  channels)  or  record  as  gain  unknown  (for  individual 
display  channels)  until  the  channel  state-of-heal th  can  be  verified. 
e.  Station  Timing: 
(1)  Stations  will  use  the  satellite  receiver  output  for  a  timing  standard 
(2)  The  DATACHROM  timers  will  be  retarded  37.001  seconds  {+/-  0.0005  sec)  from  ZULU 
time  to  compensate  for  the  CT  and  RT  processing  delays. 
6.  Operational  Records,  Logs,  and  Reports.  All  data  records,  logs,  and  reports  will  be  main- 
tained as  specified  in  Volume  I  with  the  following  exceptions: 
a.  Develocorder  Records.  The  DATA  columns  will  reflect  channel  gain  or  status  changes. 
Since  all  display  channels  are  equalized  to  nominal  gain  by  the  CT,  calibration  entries  need 
not  be  annotated  on  the  CEM  Form  49.
CENR  55-2.  Vol  XII 
14  Uovemcer  1986 
b.  Edits-  Calibration  edits  will  consist  of  the  final  SPAL  and  the  final  LPAL/3BAL  equate 
calibrations  {merged  in   chrcnlogical  order  xitn  the  edit  requests)  for  the  first  Wednesday  of 
each  requested  10  day  period.  All  calibration  edits  should  be  long  enough  in  duration  to 
include  all  channels  calibrated  for   any  given  calibration  (i.e.,  *.ne  CT,  even  for  an  EQUATE 
calibration,  will  only  calibrate  one  RT  at  a  time.  The  duration  of  the  calibration  edit  will 
be  dependent  on  how  many  instruments  each  location  has). 
c.  Station  Logs.   In  addition  to  the  items  specified 
reconfigurations  require  documentation  in  the  station  leg. 
in  Volume  I,  all  CT  resets  and 
7.  Aralysis  Procedures.   In  addition  to  the  instructions  contained  in  Volume  I,  the  MMU/SEC 
value  for   FDA  channels  will  be  computed  using  the  period  correction  factors  in  Attachment  2  and 
3  of  this  document. 
3.  Documentation  and  Disposition  Instructions.  MOT  printer  outputs  will  be  forwarded  using 
the  following  guide: 
TYPE  OUTPUT 
FORWARD  TO 
AND 
CT  Configuration 
Output 
Freq  Resp  Pri it-out 
(GET  AR  Table) 
Command  and 
Response  Data 
Depot/LGEB 
cy  to  HQ/TGX/LGM/DOSB 
Depot/LGEB 
cy   to  HQ/TGX/LGM/DOSB 
N/A 
Retain  1  copy  until  next 
configuration,  then  destroy 
Retain  1  copy  until  next 
valid  frequency  response 
Destroy  3  months  after  STPR 
edits  have  been  accomplished 
9.  Terms  and  Abbreviations: 
BBRT  -  Broadband  Remote  Terminal 
CT  -  Central  Terminal 
DOS  -  Digital  Data  Subsystem 
FDA  -  Field  Data  Aquisition 
FSF  -  Field  Site  Facility 
GSS  -  Global  Subsurface  System 
LPRT  -  Long  Period  Remote  Terminal 
MOT  -  Maintenance  Operating  Terminal 
Msec  -  Milliseconds 
RT  -  Remote  Terminal 
SA  -  Sine  wave  generation  with  CT  analysis  with  scaling  factor  replacement 
SI  -  Sine  wave  generation,  no  CT  analysis 
SN  -  Sine  wave  generation  with  CT  analysis,  no  scaling  factor  replacement 
SPRT  -  Short  Period  Remote  Terminal 
STPR  -  Station  Processor 
OFFICIAL 
5  Atch 
1.  Command  Value  Conversion  Table 
2.  Normalized  Frequency  Response  Tolerances 
3.  Period  Correction  Factors  for  23900  and 
KS36000  Short  Period  Sensors 
4.  Long  Period  System  Period  Correction 
Factors 
5.  GSS  STPR  Input  Sensitivity  (INSEMSE)
CEMR  55-2,  Vol  XII    Attachment  1 
14  November  1986 
COMMAND  VALUE  CONVERSION  TABLE 
Command  Amplitude 
Factor 
Cal ibration 
Driving  Force 
Approximate  counts 
Expected 
SPRT 
Blank 
or 
800  Mu 
400  Mu 
200  Mu 
100  Mu 
80,000 
40,000 
20,000 
10,000 
BBRT 
KS-SP 
Blank 
or 1 
800  Mu 
400  Mu 
200  Mu 
100  Mu 
60,  <^0 
30,000 
15,000 
7,500 
BBRT 
KS-LP 
Blank 
or 
20  U 
10  U 
5  U 
2.5  U 
60,000 
30,000 
15,CnO 
7,500 
LPRT 
Blank 
or 
20  U 
10  U 
5  (J 
2.5  U 
60,000 
30,000 
15,000 
7,500
CENR  55-2,  Vol  XII   Attachment  2   14  November  1986 
NORMALIZED  FREQUENCY  RESPONSE  TOLERANCES 
23900/SPRT 
.5  Hz 
.8  Hz 
1.0 
Hz 
I. i?'s   Hz 
2.0  Hz 
2.857  Hz 
4.0  Hz 
MAX 
.3454 
.836 
1.0 
1.0933 
1.0547 
.9968 
.836 
NOM 
.314 
.7962 
1.0 
1.0412 
1.0045 
.9062 
.7273 
MIN 
.2826 
.7564 
1.0 
.989 
.9543 
.8156 
.618 
KS36000  SfVBBRT 
.5  Hz 
.3  Hz 
1.0 
Hz 
1.428  Hz 
2.0  Hz 
2.857  Hz 
4.0  Hz 
MAX 
.3344 
.832 
1.0 
1.082 
1.0642 
1.041 
.8470 
NOM 
.304 
.7925 
1-0 
1.0305 
1.0135 
.9464' 
.7365 
MIN 
.2736 
.753 
1.0 
.979 
.9628 
.8518 
.626 
KS360QO  LP/BBRT  or  LPKT 
.02  Hz    .025  Hz   .0333  Hz  .04  Hz    .05  Hz    .0667  Hz  .1  Hz 
MAX 
1.4467 
1.4300 
1.2516 
1.0 
NOM 
1.258 
1.300 
1.1920 
1.0 
MIN 
1.0693 
1.1700 
1.1324 
1.0 
.7157  .3229  .0603 
.6816  .2936  .0524 
.6475     .2642     .0445
CENR  55-2,  Vol  XII    Attachment  3 
14  November  1986 
PERIOD  CORRECTION  FACTORS  FOR  23900  and  KS36000  SHORT  PERIOD  sEnSOAS 
Gt  =  Magnification  at  a  given  period 
Magnification  at  1   Hz 
Period 
Gt 
6t 
fitT 
0.2 
3.20 
0.31 
1.56 
0.3 
2.90 
0.34 
1.15 
0.4 
2.50 
0.40 
1.10 
0.5 
2.00 
0.50 
1.00 
0.6 
1.67 
0.60 
1.00 
0.7 
1.43 
0.70 
1  .CO 
0.8 
1.25 
0.80 
1.00 
0.9 
1.11 
0.90 
1.00 
1.0 
1.00 
1.00 
1.00 
1.1 
0.89 
1.12 
1.02 
1.2 
0.70 
1.43 
1.19 
1.3 
0.55 
1.82 
1.40 
1.4 
0.44 
2.27 
1.62 
1.5 
0.36 
2.78 
T.85 
1.6 
0.30 
3.33 
2.08 
1.7 
0.250 
4.00 
2.35 
1,8 
0.208 
4.81 
2.67 
1.9 
0.177 
5.65 
2.98 
2.0 
0.154 
6.49 
3.25 
2.1 
0.130 
7.69 
3.66 
2.2 
0.115 
8.70 
3.95 
2.3 
0.100 
10.0 
4.35 
2.4 
0.087 
11.5 
4.79 
2.5 
0.078 
12.82 
5.13 
2.6 
0.070 
14.3 
5.50 
2.7 
0.062 
16.13 
5.97 
2.8 
0.055 
18.19 
6.49 
2.9 
0.050 
20.00 
6.90 
3.0 
0.045 
22.22 
7.42
CENR  55-2  Vol  XII    Attachment  4    14  November  1986 
LONG  PERIOD  SYSTEM"  PERIOD  CORRECTION  FACTORS 
Gt  =  Magnification  at  a  given  period 
Magnification  at  25  SPC 
KS3600O  SENSOR 
Period 
Gt 
1/Gt 
l/GtT 
.1200 
8.333 
.8333 
.1932 
5.176 
.4705 
.2664 
3.754 
.3128 
.3396 
2.945 
.2265 
.4128 
2.422 
.1730 
.4860 
2.058 
.1372 
.5524 
1.810 
.1131 
.6188 
1.616 
.0951 
.6852 
1.459 
.0811 
.7516 
1.330 
.0700 
.8180 
1.222 
.0611 
.8544 
1.170 
.0557 
.8908 
1.123 
.0510 
.9272 
1.079 
' .0469 
.9636 
1.038 
.0432 
1.000 
1.000 
.0400 
.9954 
1.005 
.0386 
.9908 
1.009 
.0374 
.9862 
1.014 
.0362 
.9816 
1.019 
.0351 
.9770 
1.024 
.0341 
.9600 
1.042 
.0336 
.9430 
1.C60 
.0331 
.9260 
1.090 
.0327 
.9090 
1.100 
.0324 
.8920 
1.121 
.0320 
.8750 
1.143 
.0317 
.8580 
1.166 
.0315 
.8410 
1.189 
.0313 
.8240 
1.214 
.0311 
.8070 
1.239 
.0310 
.7836 
1.276 
.0311 
.7602 
1.315 
.0313 
.7368 
1.357 
.0316 
.7134 
1.402 
.0319 
.6900 
1.449 
.0322 
.6666 
1.500 
.0326 
.6432 
1.555 
.0331 
.6198  -  - 
1.613 
.0336 
.5964 
1.677 
.0342 
.5730 
1.745 
.0349
CENR  55-2,  VOL  XII    Attachment  5    14  November  1986 
GSS  STPR  INPUT  SENSITIVITY  (ISENSE) 
SHORT  PERIOD  (SP) 
DDS  ADA 
GAIN 
ISENSE 
MU/COUNT 
ISENSE  VOLTS  EQUIVALENT  (?/?)   at  100MU 
CGAIN  =  1 
CGAIN  =  0.8 
20.48 
0.0244 
0.0191 
10.24 
0.0488 
0.0381 
5.12 
0.0976 
0.07625 
2.56 
0.1952 
0.1525 
1.28 
0.3904 
0.305 
0.64 
0.7808 
0.61 
0.32 
1.5616 
1.22 
0.16 
3.1232 
2.44 
0.08 
6.2464 
4.88 
0.04 
12.4928 
9.76 
0.02 
24.9856 
19.52 
0.01 
49.9712 
39.04 
0.005 
99.9424 
78.08 
DDS  ADA 
GAIN 
LPDARTS  PORT  (LP) 
ISENSE 
MU/COUNT 
ISENSE  VOLTS  EQUIVALENT  (?/?)   at  10U 
CGAIN  =  1 
N/A 
0.333 
0^86 
SAMPLE  DEV  SENS  VOLTAGE  TABLE:  CGAIN  =  1.0 
DEV 
GAIN 
2000 
1000 
500 
250 
100 
1.0 
DDS: 
.0D2" 
.003 
.006 
.012 
.031 
.061 
.305 
.610 
3.050 
.003 
.006 
.012 
.024 
.061 
.122 
.610 
1.22 
6.100 
.006 
.012 
.024 
.049 
.122 
.244 
1.22 
2.44 
12.2 
.012 
.024 
.049 
.098 
.244 
.488 
2.44 
4.88 
24.4 
.024 
.049 
.098 
.195 
.488 
.976 
4.38 
9.76 
48.8 
.049 
.098 
.195 
.390 
.976 
1.95 
9.75 
19.5 
97.6 
.098 
.195 
.390 
.781 
1.95 
3.90 
19.5 
39.0 
195.2 
.195 
.390 
.781 
1.56 
3.90 
7.81 
39.04 
78.08 
390.4 
.390 
.781 
1.56 
3.12 
7.81 
15.6 
78.08 
156.2 
780.8 
.781 
1.56 
3.12 
6.24 
15.6 
31.2 
156.2 
312.3 
1561.6 
1.56 
3.12 
6.25 
12.5 
31.2 
62.5 
312.3 
624.6 
3123.2 
3.12 
6.25 
12.5 
25.0 
62.5 
124.9 
624.6 
1249.3 
6246.4 
6.25 
12.5 
25.0 
50.0 
124.9 
249.9 
1249.3 
2498.6 
12492.8
CENR  55-2,  VOL  XII   Attachment  5    14  November  1S86 
SAMPLE  DEV  SENS  VOLTAGE  TABLE:  CGAIN  =  0.8 
DEV 
GAIN 
2000 
1000 
500 
250 
100 
DOS: 
.001 
.002 
.005 
.010 
.024 
.048 
.239 
.4/8 
2.388 
.002 
.005 
.010 
.019 
.048 
.093 
.476 
.953 
4.763 
.005 
.010 
.019 
.038 
.095 
.191 
.953 
1.91 
9.531 
.010 
.019 
.038 
.076 
.191 
-!<">. 
1.91 
3.81 
19.06 
.019 
.038 
.076 
.153 
.381 
"J 
3.81 
7.63 
38.13 
.038 
.076 
.153 
.305 
.763 
.-  .^3 
7.63 
15.3 
76.25 
.076 
.153 
.305 
.610 
1.53 
3.05 
15.3 
30.5 
152.5 
.153 
.305 
.610 
1.22 
3.05 
6.10 
30.5 
61.0 
305.0 
.305 
.610 
1.22 
2.44 
6.10 
12.2 
61.0 
122.0 
610.0 
.610 
1.22 
2.44 
4.88 
12.2 
24.4 
122.0 
244.0 
1220.0 
1.22 
2.44 
4.88 
9.76 
24.4 
48.8 
244.0 
488.0 
2440.0 
2.44 
4.88 
9.76 
19.5 
48.8 
97.6 
488.0 
976.0 
4880.0 
4.88 
9.76 
19.5 
39.0 
97.6 
195.2 
976.0 
1952.0 
9760.0