GE Eagle 1000, Servicing Instructions

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GE Medical Systems EAGLE 1000
Page 50
Information Technologies
Servicing Instructions 227 468 01 Rev.G
2.2.11.4 Interfaces to peripherals
Mechanical interfaces
There is an interface for the patient connections of the three connectable probes (2 x
PRESS, 1 x TEMP).
PRESS:
The measurement input to the two pressure amplifiers is connected floating to the front
panel via the elbow plug-in connector P1 top right along the shortest path via ferrite toroi-
dal cores.
The single pressure input of the system with HELLIGE connectors only permits one pres-
sure transducer to be connected directly to PRESS1. Two invasive pressures can be
measured by inserting an adapter bearing two transducer interfaces to this system input.
This can be affixed to the system using a Velcro strip.
TEMP:
The measurement input to the temperature amplifier is connected floating to the front
panel on the other opposite side via the coded left-hand plug-in connector and ferrite
toroidal cores.
Electronic interfaces
PRESS:
The PRESS channels are identified by resistor coding, even when an adapter is interpo-
sed in systems with a Marquette Hellige connector. Data transfer is on channel 1 of the
ADC.
TEMP:
In model versions with Marquette Hellige round connectors the jack plug socket is scan-
ned for the position of the normally closed contact to detect the presence of the probe
(voltage at T/8 3/4U
z
= 3.53 V (from D7) connected and 1/4U
z
= 1.18 V disconnected
against approx.1/2U
z
= 2.46 V as the threshold at the comparator.