1261B User Manual
Understanding The 1261B 6-6
Racal Instruments
Ó
1995
The absolute temperature of each thermistor is measured in DC
volts. The non-linear DC voltage generated by each thermistor
is made linear by using an A/D converter, PROM look up table
and D/A converter.
A DC voltage proportional to highest temperature rise of any slot
(0.1V/
o
C) is made output to the rear panel monitor connector
J410. A voltage proportional to the intake air temperature
(0.1V/
o
C) is also output to this connector.
The TEMP LED indicates a fault (red) when the highest slot
temperature
is > 75
o
C or the highest slot
temperature rise
is > 20
o
C.
SMS Voltage
Monitoring
All of the VXI voltages of the 1261B are monitored. If the
absolute voltage value of any of these are not 10%, -
8.75% of the nominal voltage, the front panel VOLTAGE LED
shall indicate a fault (red).
When the front panel Power On/Standby switch is in the Standby
(off) position, the SMS shall indicate a fault when any VXI
voltage is > 0.5 VDC.
SMS Current
Monitoring
The front panel CURRENT LED indicates a fault (red) if the
current drawn from any power supply output exceeds the rated
peak output current by more than 7%. The CURRENT LED is
green when no fault is present.
Enhanced System
Monitor (EMS)
The Enhanced Monitoring System adds a fully VXIbus 1.4
compliant message-based interface, alpha numeric display,
individual VXIbus voltage and slot temperature reading, TTL
trigger in/outputs with programmable delay, and monitoring of
key VXI backplane signals (AS*, ACFAIL*, SYSRESET*).
Refer to
Figure 6-2 Enhanced Monitoring System Module
Block Diagram
and the description below.
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