GE Vivid 3N Pro Series, Руководство по обслуживанию

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GE M
EDICAL
S
YSTEMS
D
IRECTION
FK091075, R
EVISION
04 V
IVID
3N P
RO
/E
XPERT
S
ERVICE
M
ANUAL
Chapter 6 Service Adjustments 6-19
Section 6-7
Image Quality Calibration
The monitor’s image quality settings may need periodic adjustment due to changes in ambient light.
They can be adjusted using the Contrast and Brightness buttons on the front part of the display
monitor. As the image quality settings are often adjusted, it is recommended to check - and if necessary
recalibrate - these settings on a regular basis.
NOTE: When the monitor is too dark, and the user attempts to compensate by raising the total gain
higher than normal, the resulting image quality may not be optimal.
All display monitor controls, other than the contrast and brightness controls, are factory adjusted for optimum
settings and usually do not require further adjustment. The service representative adjusts the display monitor
to the user’s preference. To adjust controls independently, see the appropriate section below.
6-7-1 Image Quality Calibration for the Vivid 3N 15" Monitor
This section describes how to calibrate image quality related settings for the Vivid 3N ultrasound unit
monitor, configured with software version 2.0 and above.
NOTE: When the system is first switched on, the image may appear to be too dark, or to have too much
contrast. The display monitor takes twenty minutes to warm up before it shows its final contrast,
brightness, and color hues. Perform fine screen calibration only after the display monitor has
warmed up.
1) With the display monitor menu turned off, press the button (to adjust contrast) or the
button (to adjust brightness) on the front of the monitor.
2) Press the or button on the front of the monitor to decrease or increase the selected
value. These recommended settings are stable and do not drift over time, but may vary from
monitor to monitor. Adjust these recommended values to meet your specific requirements. For
example, cardiac users may prefer greater contrast, in which case set the contrast to 90 or even
100. Radiologists may prefer less contrast, in which case set the contrast to below 80
NOTE: Always perform the calibration in similar lighting conditions to those where the unit will be used.
If the unit is to be used in different lighting conditions, perform full calibration in both dark and
light conditions. It is suggested that you write down the brightness and contrast settings for both
conditions, so that the monitor can be reset to the calibrated values.
3) Press the
Exit
button twice to close the on-screen menu. The scanning screen is displayed.
4) Perform monitor calibration as described in 6-8-2 "Monitor Calibration" on page 6-23 .
Table 6-16 Vivid 3N 15" Monitor Brightness and Contrast Settings
Dark Room Light Room
Brightness
65 85
Contrast
80 100