Guralp Systems CMG-40T - Manual (Page 27)

Operator's guide
2. Select the calibration channel corresponding to the instrument, and
choose Broadband Noise. Select the component you wish to calibrate,
together with a suitable duration and amplitude, and click Inject now. A
new data stream, ending
Cn (n = 0 – 7) or MB, should 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.
Drag the calibration stream Cn across 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.
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