Appendix A Specifications for
6527 User Manual A-2 www.ni.com
Relay Outputs
Number of channels................................24, each with two terminals that
are isolated from other channels
Relay type...............................................Normally open form A solid-state
relays
Max switching voltage
AC....................................................30 VRMS (42 V peak)
DC....................................................60 VDC
Max switching capacity..........................120 mA1
Common-mode isolation........................60 VDC
30 VRMS (42 V peak)
(channel-to-channel and channel-
to-computer)
On resistance (see Figure A-2)...............35 Ω max; 25 Ω typ
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, Vrelay = 7 V
Current limit....................................260 mA
Shutdown time.................................1 µs
Overcurrent duration (max).............1 second
Power Requirement
+5 VDC (±5%).......................................500 mA max
Power available at I/O connector............+4.5 to +5.25 VDC, fused at 1 A
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.)