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Appendix A
Specifications for
Relay Outputs
Power Requirement
1
With all relays carrying 120 mA and all inputs driven to 28 V, the total power dissipation can approach 20 W. The maximum
switching capacity in PCI and CompactPCI systems must be derated according to the ambient temperature. (The PXI chassis
has built-in fans to handle 25 W per slot.)
6527 User Manual
Number of channels................................24, each with two terminals that
Relay type ...............................................Normally open form A solid-state
Max switching voltage
AC....................................................30 V
DC....................................................60 VDC
Max switching capacity ..........................120 mA
Common-mode isolation ........................60 VDC
On resistance (see Figure A-2) ...............35
Output capacitance .................................55 pF at 1 V
Off leakage current (max).......................200 nA
Relay set time (max)...............................3.0 ms
Relay reset time (max)............................3.0 ms
Power-on state ........................................Relays open
Overcurrent protection on outputs, typical at 25 °C, V
Current limit ....................................260 mA
Shutdown time.................................1 µs
Overcurrent duration (max).............1 second
+5 VDC (±5%) .......................................500 mA max
Power available at I/O connector............+4.5 to +5.25 VDC, fused at 1 A
are isolated from other channels
relays
30 V
(channel-to-channel and channel-
to-computer)
A-2
(42 V peak)
RMS
1
(42 V peak)
RMS
max; 25
typ
= 7 V
relay
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