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Rear Panel
Switch and
Connector
Descriptions
Switch Reference
Switch Reference
LOGICAL ADDRESS
Operating The 1261B 3-10
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Table 3-2, SMS Rear Panel Switches
FAULT TEST
Fault Test Switch. Set this switch to the ON position to cause a
fault indication on all SMS front panel health status annunciators
(Voltage, Current, Temperature and Airflow.
NOTE: This switch must be set to the OFF position to allow
normal operation.
Use this switch to perform a quick check of the SMS monitor and
the front panel health status annunciators.
TEMP MONITOR
Temp Monitor Check Switch. Set this switch to the ON position
CHECK
to cause the Tmax signal output (J410 Pin 4) to indicate +33.9°C
+/-2°C.
Use a Digital Multimeter to measure the voltage between J410
Pin 4 (Tmax) and J410 Pin 9 (Logic Ground).
reading should be +3.39 VDC, +/- 0.2VDC, corresponding to +
33.9°C, +/- 2°C.
NOTE: This switch must be set to the OFF position to allow
normal operation.
FAN SPEED
Fan Speed Switch. This switch enables fan speed control when
set the VAR (Variable) position. Set this switch to MAX to run
fans at full speed. In the VAR position the monitoring system
automatically controls the speed of the fans depending on the air
temperature and the amount of cooling required by the modules.
Table 3-3, EMS Rear Panel Switches
FAN SPEED
Fan Speed Switch. This switch enables fan speed control when
set the VAR (Variable) position. Set this switch to MAX to run
fans at full speed. In the VAR position the monitoring system
automatically controls the speed of the fans depending on the air
temperature and the amount of cooling required by the modules.
VXI Logical Address Switch.
Monitor VXI Logical Address Switch.
1261B User Manual
Description
The voltage
Description
Refer to Chapter 2 Enhanced
Racal Instruments Ó 1995
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Troubleshooting
