GE FC091194, Руководство по обслуживанию

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GE M
EDICAL
S
YSTEMS
D
IRECTION
FC091194, R
EVISION
02 V
IVID
7 / V
IVID
7 PRO S
ERVICE
M
ANUAL
7 - 60 Section 7-4 - Acquisition Diagnostics
7-4-3 Beamformer Calibration
When following the steps in 7-4-2 - Start System Test on page 7-59 , the default screen will be the
Calibration Screen.
From the Calibration Screen you can;
• Do DC Offset Calibration (DC Offs. Cal) of the A/D converters in the Front End.
• Reset the calibration (Cal. Reset) to the factory default setting.
• Show a graph regarding the calibration (Show graph).
• Deselect/Select channels are used in manufacturing to isolate noisy channels (Channel Control).
With a linear probe connected to the system, it is possible to disconnect groups of channels either
on the TX Board or on the RX Board to isolate the noise source.
• The buttons in the lower part of the screen are used for board testing (see 7-4-4 - System Test on
page 7-61 ).
To start a test, click the respective button.
The “LEDs” in Figure 7-55 will change color when a test has been done;
• Green indicates that the test passed.
• Red indicates that the test failed.
Figure 7-55 Calibration Dialog
Channel Control
(used for factory
tests)
DC Offs. Cal
Cal. Reset
Show graph
“LEDs”
Gray - Test not done
Green - Test Passed
Red - Test failed