![background image](http://html1.mh-extra.com/html/racal-instruments/1261b/1261b_user-manual_3120226063.webp)
1261B User Manual
Operating The 1261B 3-10
Racal Instruments
Ó
1995
Rear Panel
Switch and
Connector
Descriptions
Table 3-2, SMS Rear Panel Switches
Switch Reference
Description
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
CHECK
Temp Monitor Check Switch. Set this switch to the
ON
position
to cause the Tmax signal output (J410 Pin 4) to in33.9°C
+/-2°C.
Use a Digital Multimeter to measure the voltage between J410
Pin 4 (Tmax) and J410 Pin 9 (Logic Ground). The voltage
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
Switch Reference
Description
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.
LOGICAL ADDRESS
VXI Logical Address Switch. Refer to
Chapter 2
Enhanced
Monitor VXI Logical Address Switch.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com