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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
Functional Description 4-3
headroom requirements and specifications for each power converter range.
Type 1 and Type 3
The type 1 power converter is designed for use in a VXI 3.0 chassis and the type
3 power converter is designed for a VXI 4.0 chassis and utilizes the additional
power pins and can supply more current. Installing a type 3 power converter in a
VXI 3.0 chassis is allowed but it is up to the user to limit the number of active
channels to prevent damage to the chassis.
Table 4-1: Power Converter Type 1 and Type 3 Ranges
Range
V+ Nominal Voltage
V- Nominal Voltage
-12 to +12
+16V
-15.6V
-15 to +5
+9.6V
-19.2V
-10 to +10
+16V
-14.1V
-5 to +7
+12V
-9.6V
-5 to +15
+19.2V
-9.6V
0 to +22
+28.8V
-4.5V
-2 to +20
+26.4V
-6V
Type 4
The type 4 power converter has a reduced voltage range and better power
distribution of the VXI backplane supplies.
Table 4-2: Power Converter Type 004 Ranges
Range
V+ Nominal Voltage
V- Nominal Voltage
-7 to +7
+14.4V
-11.7V
-15 to +2
+9.6V
-18.9V
-10 to +9
+16.8V
-14.1V
-3 to +7
+14.4V
-7.2V
-5 to +5
+14.4V
-9.6V
0 to +16
+24V
-4.5V
-2 to +14
+21.6V
-6V
Inter-Module Control
The T940 inter-module configuration is determined by jumpers and the primary to
terminator order is right to left. The following sections describe the T940 inter-
module implementation.