Chapter 3 Signal Connections
© National Instruments Corporation 3-23 NI 660x User Manual
Transmission Line Effects
Transmission line effects can degrade the signal and cause measurement
errors. Use twisted-pair wires to connect external signals to the device to
improve impedance matching and signal integrity. The NI 660x provide
onboard series termination to reduce signal reflections when it drives an
output.
For reflection problems that occur when the device drives the signal,
use parallel AC termination at the destination. When using a National
Instruments SH68-68-D1 cable, the recommended values for R
P
and C
P
are
68 W and 150 pF, respectively.
PFI 24 30
PFI 25 30
PFI 26 65
PFI 27 65
PFI 28 33
PFI 29 33
PFI 30 68
PFI 31 68
PFI 32 42
PFI 33 39
PFI 34 42
PFI 35 41
PFI 36 39
PFI 37 41
PFI 38 36
PFI 39 36
Table 3-9. Signals and D GND Pin Number on 68-Pin Connector Block (Continued)
PFI Number Pin Number for D GND
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