* 地震計 CMG-3ESPC (Güralp) [#k0e6c9b6]


** Pictures [#v4af505a]
*** Seismometer [#pc885af2]
#ref(seismometer.JPG,,15%);

*** Break Box [#pc885af2]
#ref(breakbox.JPG,,15%);

**How to Use [#ede3edff]


+ Prepare a power supply. You need ''bipolar 12V''.
+ Connect the power supply and the break box by a power supply cable.
The power supply cable is the one with 2 wires at the end (one is red, the other black). Connect the red-colored cable to +V, and the black one to -V.
+ Connect the seismometer and the break box by the thickiest cable
+ Connect the cable you haven't connected to the "RECORDER" terminal of the break box. This cable has ""3 output"": ''green'', ''white'', and ''yellow''. These correspond to ''NS'' , ''EW''(horizontal) and ''Z''(vertical). 
+ Turn on the power supply.
+ Push "ENABLE" button and "UNLOCK" button at the same time for 7 seconds. Then the "BUSY" LED will light. After a moment, the outputs will fluctuate around 0. If not, push "ENABLE" and "CENTRE" in the same way. Then the instrument start to calibrate its position to the center.
** Parameters [#v3c56c1c]
*** Response function [#x0cfeb6f]

#ref(Response.png,,70%);
#ref(ResponseFunction_CMG.png,,17%);

*** Output assignment [#g22c060a]
| output | direction|
| green | N-S |
| white | E-W |
|yellow | Z (vertical) |



*** zero & pole [#gab190ad]
| pole (Hz) | zero (Hz)|
| 5.89 x 10^{-3} + 5.89 x 10^{-3} i | 0 |
| 5.89 x 10^{-3} - 5.89 x 10^{-3} i | 0 |
| 80 | |
| 160 | |
| 180 | |

*** Gain [#reeacf06]
|axis|Gain|
|NS|991|
|WE|992|
|N-S|991|
|W-E|992|
|Z|980|

** Noise Level [#bce4b3f6]
will be written someday.

** Reference [#bee926e2]
- [[Manual>https://www.guralp.com/documents/MAN-C3E-0001.pdf]]
- [[Calibration sheet>https://granite.phys.s.u-tokyo.ac.jp/wiki/Lab/index.php?plugin=attach&pcmd=open&file=CalibrationSheet.pdf&refer=AndoLabInstrumentsSeismometer]]



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