National Instruments VXI-USB User Manual
Appendix C
Advanced Hardware Configuration Settings
C-6
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Figure C-6. Drive Noninverted External CLK SMB
Trigger Input Termination
Located within the group of CLK10 switches is switch S3, which controls
whether to put a 50
whether to put a 50
Ω termination on the external trigger input SMB.
Figure C-7 shows the setting for a nonterminated trigger input SMB. Use
the default setting of Figure C-7B to terminate the trigger input SMB.
the default setting of Figure C-7B to terminate the trigger input SMB.
Figure C-7. SMB Trigger Input Termination
S3
S4
S5
S6
OUT
IN
S2
From
Onboard
Oscillator
Onboard
Oscillator
From SMB
CLK10 In
CLK10 In
S1
Inverted
Noninverted
A. Does Not Terminate
Trigger Input
B. Terminate Trigger
Input (Default)
S3
S4
S5
S6
S2
S1
ON
OFF
S3
S4
S5
S6
S2
S1
ON
OFF