Triggering, External trigger (pfi 1), External frequency reference input – National Instruments NI PXI-5621 User Manual

Page 7: Calibration

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7

NI PXI-5621 Specifications

Triggering

Modes..................................................... Immediate, software, digital

Sources ................................................... PFI 1, PXI<0..7>, PXI STAR

Export..................................................... PFI 1, PXI<0..7>

Slope....................................................... Rising, falling

Pretrigger depth...................................... Up to 32 MS

Posttrigger depth .................................... Up to 32 MS

Minimum pulse width ............................ 100 ns

External Trigger (PFI 1)

PFI 1 connector ...................................... SMB male

Trigger level ........................................... TTL

Max input voltage .................................. 5.5 V

External Frequency Reference Input

Connector (REF CLK IN)...................... SMA female

Impedance .............................................. 50

Ω nominal

Input amplitude ...................................... –5 to +15 dBm

Max non-operating input level ............... +20 dBm

Max DC input voltage............................ ±3.5 VDC

Frequency range ..................................... 10 MHz ±40 ppm

Crosstalk from reference input............... <–85 dB

Calibration

Calibration interval ................................ 1 year

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