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NI 5421 Specifications 24 ni.com
Start Trigger
DDC CLK IN
Clocking
Format
DDC Data Output signals change on the rising edge of
DDC CLK IN.
—
Frequency
Range
10 Hz to 105 MHz —
Input Duty
Cycle
Tolerance
40% to 60% —
Input Jitter
Tolerances
300 ps pk-pk of Cycle-Cycle Jitter, and 1 ns rms of
Period Jitter.
—
Table 8.
Specification Value Comments
Sources 1. PFI<0..1> (SMB front panel connectors)
2. PFI<2..3> (DIGITAL DATA & CONTROL front panel
connector)
3. NI PXI-5421—PXI_Trig<0..7> (backplane connector)
NI PCI-5421—RTSI<0..7>
4. NI PXI-5421—PXI Star trigger (backplane connector)
5. Software (use function call)
6. Immediate (does not wait for a trigger). Default.
—
Modes 1. Single
2. Continuous
3. Stepped
4. Burst
—
Edge Detection Rising —
Minimum
Pulse Width
25 ns. Refer to t
s1
at NI Signal Generators Help»Devices»
NI 5421»NI <bus>-5421»Triggering»Trigger Timing.
—
Table 7. (Continued)
Specification Value Comments