Chapter 2
SC-2060 Board
© National Instruments Corporation
2-3
SC-206X Series User Manual
Warnings: When connecting or disconnecting signal lines to the screw terminals, you must power off
the lines. Potential differences between the lines and the SC-2060 ground create a shock
hazard while connecting the lines.
Connections, including power signals to ground and vice versa, that exceed any of the
maximum input or output signal ratings on the SC-2060 board can result in damage to any
or all of the boards connected to the SC-206X Series, to the host computer, and to the SC-
2060 board. National Instruments is not liable for any damages resulting from incorrect
signal connections.
Specifications
The following sections list the specifications of the SC-2060 digital signal conditioning accessory
board. These ratings are typical at 25
°
C unless otherwise stated. The operating temperature range for
this board is 0
°
to 70
°
C.
Optically Isolated Digital Input
Number of channels
Eight
Isolation
Working voltage
300 Vrms (minimum) channel-to-channel or
channel-to-ground
Note:
This product complies with IEC-1010 for Voltage Installation Category II Pollution Degree 2.
Common-mode rejection
Typical
500 V/
µ
s
Minimum
100 V/
µ
s
Data rate
Up to maximum speed of host board (500 kHz)
Propagation delay
t
PLH
= 75 ns (typical) with I
IL
= 7 mA
t
PHL
= 45 ns (typical) with I
IL
= 7 mA
Input
Compatibility
Most TTL and CMOS logic
Input impedance
300
Ω
±
10%, 0.25 W (maximum)
Maximum current
I
IL
= 20 mA (maximum)
Field connections
Two screw terminals per channel
