1261B User Manual
Racal Instruments
Ó
1995
Understanding The 1261B 6-9
relative to the ambient temperature, and outputs a
voltage proportional to the maximum temperature
rise at the rear panel monitor connector J414.
C
Calculates the maximum VXI slot temperature and
outputs a voltage proportional to the maximum slot
temperature at the rear panel monitor connector
J414.
C
Provides an RS-232 interface(J412) over which
commands may be received and replies sent by the
EMS.
User Limits On
EMS Monitored
Parameters
Many of the monitored functions provide the capability for the
user to program upper and/or lower limit values. When a limit is
exceeded, the EMS will generate a VXI interrupt (if enabled to do
so) which notifies the user of an alarm condition. Refer to
Chapter 4 Using the Enhanced Monitor
for complete
information.
Timestamps On
EMS Monitored
Events
For many of the monitored functions, a timestamp is saved by
the EMS software. This time stamp indicates the time of the
most recent occurrence of an alarm condition for that monitored
function. The timestamp may be queried by the user via SCPI
commands. The timestamp includes both time and date
information for the alarm. Refer to
Chapter 4 Using the
Enhanced Monitor
for complete information.
EMS Rear Panel
Fan Speed Monitor
A TTL pulse train at the speed (RPM) of each fan is output to the
EMS rear panel Monitor Connector J414. The fans output two
pulses per revolution.
EMS Fan Speed
Control
The speed of the module fans is controlled by either the slot with
the highest absolute temperature or the highest temperature
rise.
If the absolute temperature of any slot e40
E
C, the
module fans operate at full speed. If the temperature rise of any
module slot exceeds 10
E
C, the module fans operate at full
speed.
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