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1261B User Manual
Racal Instruments
Ó
1995
Operating The 1261B 3-11
Table 3-4, J410 SMS Rear Panel Monitor
Pin
Signal
Description
1
+5V
+5 V for powering external user
circuitry, etc. (1 A max.)
2
+12V
+12 V for powering external user
circuitry, etc. (1 A max.)
3
+24V
+24 V for powering external user
circuitry, etc. (1 A max.)
4
T
max
Output signal proportional to the
maximum absolute temperature of
the 13 modules (100 mV/
o
C, 0 V
corresponds to 0
o
C)
5
∆
T
Output signal proportional to the
maximum absolute temperature rise
(w/ respect to internal ambient
sensor) of the 13 modules (100
mV/
o
C, 0 V corresponds to 0
o
C)
6
TACH1
TTL output proportional to the speed
of Fan 1 (2 pulses/ revolution)
7
TACH2
TTL output proportional to the speed
of Fan 2 (2 pulses/ revolution)
8
TACH3
TTL output proportional to the speed
of Fan 3 (2 pulses/ revolution)
9,10,28
GND
Logic Ground
11-27,
29-37
RSV
Reserved
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