GE MEDICAL SYSTEMS
D
IRECTION 2392751-100, REVISION 3VIVID™ 4 SERVICE MANUAL
6-14 Section 6-7 - Calibration
6-7-3 Beamformer Calibration
NOTE: IMPORTANT - Do not perform BF Calibration after operating in CW or PW scanning modes since
validation will fail. Perform the BF Calibration procedure only after 2D scanning mode.
Beamformer (BF) calibration is performed to calibrate each of the two BF input’s ADC channels. The
system calibrates the ADC to zero when there is no signal in the input. These bias voltages are stored
in the back end. When changing the BFs, swapping the BFs, or changing the hard disk, perform the BF
calibration procedure.
1) Access the calibration options, as described in the Calibration section, page 6-11.
2) Trackball to the Calibration button and press Select. The bias voltages for each channel are
validated and stored in the back end.
Note: If necessary, Trackball to the Validation button and press Select to validate the currently
saved bias voltages for each channel without performing calibration.
6-7-4 Video Grabbing Calibration
Video Grabbing calibration is performed when the system’s Y/C Video Output is connected to the
Y/C Video Input.
1) Access the calibration options, as described in the Calibration section, page 6-11.
2) Trackball to the Video Grabbing button and press Select. The Video Grabbing window is
displayed, as shown below:
Figure 6-8 Video Grabbing Window
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