1261B User Manual
Racal Instruments
Ó
1995
Operating The 1261B 3-9
WHAT YOU SEE
ON THE FRONT
PANEL
WHAT IT MEANS
WHERE TO VERIFY
Temp LED Green
or
“System OK”
·
Maximum slot temperature
#
75
E
C
·
Maximum slot temperature rise
#
20
E
C
·
J410 Pin 4 on SMS
or
J414 Pin 4 on EMS.
100mV per
E
C, 0
E
C
corresponds to 0 V
·
J410 Pin 5 on SMS
or
J414 Pin 5 on EMS.
100mV per
E
C, 0
E
C
corresponds to 0 V
Use J410 or J414 Pin 9 or 10
as ground reference.
Airflow LED Green
or
“System OK”
·
Module cooling fans are operating
above acceptable limit
Fan Speed
$
900 RPM (SMS units)
or
Fan Speed
$
2000 RPM (EMS units)
·
J410 Pin 6, 7, 8 on SMS
or
J414 Pin 6, 7, 8 on EMS.
2 Pulses per Revolution, TTL
Pulse Train
Use J410 or J414 Pin 9 or 10
as ground reference
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