Noise Picked Up From The Air; Noise Received Through The External Cables; Doppler Noise; Intermittent Noise - GE LOGIQ Totus Basic Service Manual

Direction 5936427, Rev. 1
7-6-2

Noise picked up from the air

Table 7-20
Noise is coherent -"penlight noise"
pointing down in the picture due to the
fact that the noise is received on all
channels.
Noise is a problem on a single probe.
Noise is a problem on a single probe
port.
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Noise received through the external cables

Electromagnetic Interference (EMI) from radio frequencies, magnetic fields, and transients in the wiring.
The noise can enter the LOGIQ Totus through the mains power cable, probe cable(s) or any other
external connected cable(s).
Disconnect cables that are not needed for the basic use of the LOGIQ Totus:
• Network cable
• Cables to any external peripherals
• ECG cables and other cables connected to the Patient I/O
Verify whether the noise changed or disappeared when the cables were removed.
Often, this type of noise is due to grounding problems in the mains power system or when the LOGIQ
Totus is sharing a power line with other equipment.
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Doppler noise

Doppler noise symptoms can be horizontal stripes or spikes.
Table 7-21
Horizontal stripes
Spikes
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Intermittent noise

Intermittent noise can be caused by other equipment.
Table 7-22
Intermittent noise
Intermittent noise present around the clock
Intermittent noise present at certain times
GE HealthCare CONFIDENTIAL
Noise Conditions Picked Up from the Air
Symptom
The electromagnetic
interference (EMI) from
radio frequencies,
magnetic fields, and
transients in the air.
Noise Conditions for Doppler
Symptom
Typically an analog
problem caused by the
UAC-T or UCO-T
Typically a digital
problem caused by
either the UAC-T or
UCO-T
Noise Conditions for Intermittent
Symptom
Chapter 7 Diagnostics/Troubleshooting
Cause
Test whether the noise is picked up by a probe cable.
Test with another probe.
Move the LOGIQ Totus to another location to if the noise
persists.
Cause
Determine if one of these boards is the cause:
• Transmit & Receive board (UAC-T)
• Probe interface board (UCO-T)
Determine if one of these boards is the cause:
• Transmit & Receive board (UAC-T)
• Probe interface board (UCO-T)
Check equipment that is turned on and off near the scanner.
Check the clock.
Check equipment that is turned on and off near the scanner at
certain times.
LOGIQ Totus Basic Service Manual
Solution
Solution
Solution
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