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
