Guralp Systems CMG-3ESPCD User Manual
Page 34
CMG-3ESPCD Digital Broadband Seismometer
Calibrating the 3ESPCD
together with a suitable duration and amplitude, and click Inject now.
A new data stream, ending Cn (n = 0 – 7) or MB, will appear in
Scream!'s main window containing the returned calibration signal.
3. Open a Waveview window on the calibration signal and the returned
streams by selecting them and double-clicking. The streams should
display the calibration signal combined with the sensors' own
measurements. If you cannot see the calibration signal, zoom into the
Waveview using the scaling icons (
) at the top left of the
window or the cursor keys.
If necessary, drag the calibration stream Cn up the Waveview window,
so that it is at the top.
4. If the returning signal is saturated, retry using a calibration signal with
lower amplitude, until the entire curve is visible in the Waveview
window.
5. If you need to scale one, but not another, of the traces, right-click on
the trace and select Scale.... You can then type in a suitable scale factor
for that trace.
6. Pause the Waveview window by clicking on the
icon.
7. Hold down SHIFT and drag across the window to select the calibration
signal and the returning component(s). Release the mouse button,
keeping SHIFT held down. A menu will pop up. Choose “Broadband
Noise Calibration”.
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Issue B - November 2013