7.8.2.1 How to analyze the EMC noise
1.
Switch on the Voluson E-Series system and choose settings which show EMC noise in the ultrasound
image.Typically the ultrasound probe must be contacted (hold in hand/apply to body) to observe EMC
noise.
2.
Disconnect one by one all cords that are connected to the Voluson E-Series system like LAN/Ethernet,
VGA, DVI, S-Video, USB, ... on the ultrasound system-side and observe the EMC noise.
3.
If EMC noise is still present after disconnecting all cables, then use the stand-alone Power Filter
(H48701EL) to power the Voluson E-Series system. Connect the Power Filter between AC mains and
the Voluson E-Series system.
Figure 7-28 Power Filter - Connection Scheme
Note
Make sure, that:
-
the Power Filter (1) is located behind (not under) the Voluson E-Series system.
-
the Power Filter (1) is not close to any metallic devices.
-
the AC mains power cable (3) is not located near/under the Voluson E-Series system.
-
the AC mains power cable (3) is not located close to the short 1m Power Extension cord (2).
4.
Switch on the Voluson E-Series system.
5.
Activate the ultrasound probe and choose settings which show EMC noise in the ultrasound image to
check for EMC noise (EMC noise should be absent). If EMC noise is still present – then check again for
any other conducting connections to the Voluson E-Series; perform step 2.) again.
6.
Connect one by one other cords to the Voluson E-Series system like LAN/Ethernet, VGA, DVI, S-
Video, USB, ... and check for EMC noise.
If a stand-alone UPS (Uninterruptible Power Supply) is available to power the Voluson E-Series
Connect the UPS between AC mains and the Voluson E-Series system in the same manner as shown in
; - instead of the stand-alone Power Filter.
1.
Switch on the Voluson E-Series system.
2.
Activate the ultrasound probe and choose settings which show EMC noise in the ultrasound image to
check for EMC noise (EMC noise should be visible).
3.
Disconnect one by one all cords that are connected to the Voluson E-Series system like LAN/Ethernet,
VGA, DVI, S-Video, USB, ... on the ultrasound system-side and observe the EMC noise.
4.
If EMC noise is still present after disconnecting all cables, then disconnect the AC mains power cord
that supplies the UPS from the wall outlet socket.
If EMC noise is absent, then it is confirmed that the EMC noise source is in the power line of the wall
outlet socket.
5.
If EMC noise is still present – then check again for any other conducting connections to the Voluson E-
Series; perform step 3.) again.
6.
Connect one by one other cords to the Voluson E-Series system like LAN/Ethernet, VGA, DVI, S-
Video, USB, ... and check for EMC noise.
Diagnostics/Troubleshooting
Voluson E-Series Service Manual
5539550APB Revision 6
7-23
Содержание Voluson E Series
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