Guralp Systems CMG-DM16R8 Operating instructions

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
 !"#
$%&' ()
 *+,-
- 
.//
 !! !"#
!/
!!(!01//
!!(  !"# !
"#/   / 
 /&
 2  
//&!&/
 
3' 4$(&4
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5!6
%&!'######################################################################(
4'7
448)+
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69/
64. /,
6$"// / /4
66"/!/ 4
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7':1/";44
74. 4$
7$/ !47
76 :47
775!:4,
7.4<
"!'####################################################################$,
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+1$+
+4$+
+$"3$+
+6"59.$,
+753.5*$,
+3!$,
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./*,&,!/ &:
    9  </  )    ./  !  !!   /
 1/
 !  !/ 
.//( = !/ (
 ' !  / ! &    %
 ( & / ! !(/ /
</    (      47!  >?  !   @  ! 
!!A
5/ 
       "    @   74A&
!(    !  !   
  9!$
/!(  ! 
4! B14!
  /C " 

  "    1  !  

 !   
/     '(  "&
! )
'!@%/%,A=
74)*=
'!@ !'!DA
E
"  ! *"4$4  *"644     

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= //!!!! :F
'GC<
H 4 $
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./!/= ! :!
 C( ! (     IJ -/
!   /  1/      !  1)  
: ///2  
G
.   ! / = !1 !!  
  .1     (  1
!! ( /!/
 
5!
 !" / &/
*./49) 1,
/ 1/! "
///
./*! !! 1/ '
'     ./ '  1!1
1)( #C!&!(
=(1 !  
.'B31)./*' :1/
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6 3'
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4!!! '!! !1@K4J
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!&/  ! / &&
!/ &(1//1 &&
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:./?!  &
!! '  /     "'*- .
: /   &  / !! '  /
! 1@!6!L
!A<1  ! 9/! 1
!  !    /   & 
(  /          ! C&   1
:
.!"!  !@KBJA
/(/'(/47
1@!/A
.!!/! 1/7 F
'!&
 
/471
  !  /  3   / 471
!& //!'!
/
-3 9 /  !( /"
(@A/"3 ./
B*,         1       "  (  
/ ! ./://
/(/"( /"
3     "2        /
/&/"5"3
/// 77 
/ "!
 3'
5!0
D! #-
"!  -!  5"!!  !'!)!6   ./  #-  M/
*--1/(/0  
!   "/  1M/ / 
!1
5!*!6./#-M/N-##5O1/
'D )/./M//
#-!/:! @A (
/
.7/7  5.7!4/ .7!46   3
1//   )   )1   "'*-
@2! C )&( !A
3 #-  =& "'*-   /&  / ) 
"'*-! C
*--P"'*-/)1  )
@/#- ) / )(A
*-P )@A1)1 
89-!589!!'!)!6./! 
/"(
(//"(/
!(
*- )P"/!&
/:C
*-- )P( &"/
:C
*--  ) / 1/ 3" #-P 
" /  :C  /    
/
448)
 ' / "    / ? !  )
>"3!?@"  !A
4 '/ /! )>5!?
/'5!'
H 4 +
'
$ 3 "'*-1@ /!A'

6 ' 4J ' !1 !!  / *, ! 
)>1?@/*,1 !$
J'A4J&/*,1444&$
$41/"4
7 .  :  /  '5  !      /  &
/11"'*-
 ' )/>D ?& >"!?
, 3'
5!0
+ " />'?
' )/'5!1///
, " ./
*
!1
"'*-1 &/! ///
! 
< ' ):/(  "11
3 / (   " 11 / :  /
 1 !!  /  /  ./ 
1 !!///
./  "  3?    C  /    2 
/&!! 
@./   ! / = !   !
/ A
./        >?      
/
     1      /
/ ( = !  /   /
H 4 <
'
(/47!>?! //
4D  /    >(    "?  11&  /
;!4<4;3=4;!4
$"  /     /  /
O(J1
11
6./&/
 )/&/!!! 
>J1? 1 11& >"? /  ! 
C./: )1 (//
# )(/C!"
 & /   / " & 
/          (  
// / )
 3'
5!0
$)! *!
./  !(    !/
!/"/
./! "'33C!)/
 )// ./ 4
 )
."11/ )/"3>QQQQ?&
@1/ QQQQ  / A 3 / C!  1 / 
4
// 1/>?! !
 ! /  ! /   !& :1
( & /     ./
    1   /    / /(
/// )!
 )./ 1  !/ : /
! &!! &//
 !
.! P
H 4 
Firmware revision
System
type
System ID & serial number
Internal clock
Sample rates
DSP filter version
Selected tap, sample
rate and channel
Data port baud rate GPS port baud rate
'
./  1 ! /   1/(  
!1!3/!/
/ /  /    /   >1/?
&  1//  1      /    /  = 
!C !1!
3 /  /( "  
//!!
O/":! !
//(//11  
/1
D> ?"1  !>"?
!/ )! 
"1//( (/ 
!&  !          /1    (
 /
3 "!1  )/P
3"/(E 2 /
 ( 1! &
    /  /   (  
!(   /  ! 2   
 "(/./!1  
/1 /     / ! 
/
4 3'
3-D position requires minimum
of 3 SV’s (Satellites in View)
4 shown here
Position from GPS
Satellite in View number,
elevation, bearing and
either ‘obscured or
Signal/Noise ratio of
signal (30 to 50dB normal)
5!0
./ / 11 1
  /  "      !      !  :C  @2  $
 A!./ 1
(>?&1// (
4
3 " :C /   (  & /
 1 / 1/  /  !   /
  )/1/(/!
./  G    )  / !  
/  "   1  / /
  '(// 
!/1./!/
!1 !1/// )!
>* .' )?L/ 1/
*/1   /(/1

./ !1 1!)!/ 
 / /"!  !  ! 
G/ (       ./ 
 //1 ! %
1//"!!G/( 
  /    5  /  /    /(    /
 / //>!/?@=
1   %  "A  /  @2
A  ("/ !/ 
!//  !! &
>!1?  (      O/       
(
H 4 $
'
/ >?G /( 
>?  3/
! (/1//
1  !1 @  !A / ( 
!1 !!!// ! 
1//>:? 
6 3'
Synchronisation
process commenced
Internal clock synchronised to GPS
Notice time shift of 2 seconds from
17:10:30 to 17:10:32 in this example
Synchronisation control
parameters.(zero ‘drift’ in
the first instance during
coarse adjustment. ‘pwm’ is
a saved parameter)
5!0
./  !     ! /
/1 1P
./ =   :  /    
/!( 
@ 7 RA.(/:&(
4@ST4A(3 !
(//  1/1
= 1/@(URA
@UA
H 4 7
'
.// 1/1&/!!/1&/=
&   !1     ) ) 
/ " )! ( !!C 1 (
/!
./ ( !/  1 !   ! ! 
      / =(      )
/2 !
 3'
Offset or phase
error between
digitiser internal
1Hz and GPS
1pps.Closes in to
less than 5s
Drift or frequency
error between
digitiser internal
clock and GPS
PWM – Pulse
Width Modulation
control signal
applied to a DtoA
to control internal
clock/GPS error
5!0
,-./0.!
3     :  /    !  
  !  !1
 /  /       
".B#. (   /  !  1/ /
  2   ./  !  /      
  (  1! &
///! /!1/
 / /& 
/!/&  
 / & ! / C MC   !
/E(  !
"/1 ( / !! 11&  C!   
(1/!.1(
/1// //1 1111//&(
   !&     
  // !    ! 4 !  !

H 4 +
'
./!( / %
!&: 767%
"S&  #S 7&  "B# S&  !S6&  !
S+
./      /     /    (
( C! ! :/
 3        1/ / 
':"/5!?
69/
./    ':  "    /  5!?  
   /1  : /   !
 !$=! &  1/
/.! & 1/
  !     &    
  !//! 
./ /".B#.
 ! :     ( / &
!( !
:// &!
/   /(! /
!(/ 1
!: 
/ 1/ !"#
/1(  .
//!/ /&/1
!!: !///
./: (C(
1/!:2&G
/&C! ./
!(1//$ !
:  @1&   1A 1//   (  /
:!!! :/! B
./: /( 1!<V/
22/ !&/1&
1: /(//!2V&
4V  7V  / 2 2 !(  D
C! &1/! B!:(
@.!WA/ 1!/: 1 67%&
///!1 7%&%47%
, 3'
5!0
./ !  :  :  /1  /  1
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1/
4
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1/
7
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4  < 4 < 7 <
 7 67  67 47 67
7 47 447 7 447 47
447
6 4 , 6 ,  ,
47 47
4
7
47 4
7
47
4
7
4  < 4 < 7 <
4 7 47 447 7 447 47
447
47 47
4
7
47 4
7
47
4
7
4  < 4 < 7 <
 7 67  67 47 67
, 6 $ , $ 4 $
7 47
447 7 447 47
447
6 7 , 6 ,  ,
4  < 4 < 7 <
/ &//2: 1
  : /   !  !  2
./ :      / ! &
1//)/!@4A1/@&4
7ADC! P
2 5 bandpass
:/1: /!!W4&/4
! B!C! &!: 1/
7%@7V2A<%@<V2A./
!/(1 P
Tap#2 20 s/s Bandpass: 5.0->9.0Hz
./ ! !   / ( 2 !
H 4 <
'
(  /1/: 1
64. /
./ /!! /!: 
".B#. (/ 
 !   ! ( 1  : 
!&/(@".A (
@#.A&  /    / 1  /  ! ! 
!  @".B#.A   3  /    C    :
// &/ &/
        /        1  /  :
//  ./  1)    
   1/ /  !  
./  !!    )    /    (&  /  /
      !    &        /
4 3'
/