GE FQ000040, Руководство по обслуживанию

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GE
D
IRECTION
FQ091019, R
EVISION
2 V
IVID Q
N S
ERVICE
M
ANUAL
5-14 Section 5-3 - Front End Unit
5-3-3-7 Probe Management
5-3-3-7-1 Mechanism
The RFI Board performs the following probe management functions:
• Controls the selection of a probe connector
• Senses the Probe type
• Senses the Scan Plane Angle on TE probes
• Senses the Probe temperature
• If the temperature exceeds the maximum temperature, the RFI stops scanning and disables
Tx voltage.
The temperature references are set to 41.3
o
C and 43.0
o
C
• If the temperature reading falls below minimum temperature, the RFI stops scanning and disables
Tx voltage.
The minimum temperature references are set to 15
o
C. A temperature reading as low as 15
o
C
indicates a probe temperature-sensing error.
Table 5-3 RFI Board - Input DC Voltages
Input Description Connector - PIN# Connected From
+3.3 V DC voltage from PS P14 1-4 From PS
HVP_IN Fixed DC high v80 V P14-9 From PS
HVN_IN Fixed DC high voltage -80 V P14-11 From PS
+THV Transmit high voltage
varies from 0 to +50 V P14-12 From PS
-THV Transmit high voltage
varies from 0 to -50 V P14-14 From PS
+5 V_IN DC voltage from PS P14-16 From PS
-5 V_IN DC voltage from PS P14-20 From PS
+12 V_IN DC voltage from PS P14-18 From PS
1.8 V DC voltage from PS P1421, 22 From PS