Guralp Systems CMG-CD24 User Manual

Page 50

CMG-CD24

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.

4. Drag the calibration stream Cn across the Waveview window, so

that it is at the top.

5. If the returning signal is saturated, retry using a calibration

signal with lower amplitude, until the entire curve is visible in
the Waveview window.

6. 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.

7. Pause the Waveview window by clicking on the

icon.

8. 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.
If it doesn't it is likely because you have not selected at least two

signals (calibration and the returning components)

9. Choose Broadband Noise Calibration.

Issue C