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National Instruments · PXI

PXI-6608

The National Instruments PXI-6608 combines eight 32-bit counter/timers with digital I/O and a 10 MHz oven-controlled crystal oscillator (OCXO) for precision timing in PXI systems.

ManufacturerNational Instruments

ModelPXI-6608

Product TypeCounter/timer module with digital I/O

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Counters8 up/down counters, 32-bit

Digital I/O32 static TTL/CMOS lines

Reference oscillator10 MHz OCXO

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Overview

Product overview

Key product information and technical features.

The PXI-6608 adds an oven-controlled reference oscillator to the counter/timer functionality of the 6602. Its stable 10 MHz output can serve as a counter GATE or SOURCE, or provide the PXI backplane reference when installed in slot 2.

NI also documents GPS-referenced timestamping and triggering with the PXI-6608, an external GPS receiver, and appropriate software. This is a system-level application, not a built-in GPS receiver.

Counter inputs and outputs can be routed internally or externally.
Hardware triggering can start multiple counters simultaneously.
Slot-2 operation allows the OCXO to supply a stable reference to other modules phase-locked to the PXI backplane clock.

Verified specifications

Technical data

Verified product specifications.

Counter/timers	8 up/down
Counter resolution	32 bit
Maximum source frequency without prescaling	80 MHz
Maximum source frequency with prescaling	125 MHz
Digital I/O	32 channels; static; TTL/CMOS-compatible
Data transfer	DMA, up to 3 channels; interrupts; scatter-gather DMA
OCXO frequency	10.000000 MHz
I/O connector	68-pin female, SCSI-II type

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National Instruments

Manufacturer

PXI

Modular instrumentation platform

PXI-6608

Counter/timer and reference-clock module

Backplane reference

Installed in slot 2, the PXI-6608 can drive its OCXO reference onto the PXI backplane.

Use slot 2 for OCXO backplane-clock operation; allow the oscillator to warm up as described in NI documentation.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI 660x SpecificationsSpecifications · download.ni.com

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Note to Users: About Your 6608 DeviceOperating Notes · download.ni.com

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Making Accurate Frequency MeasurementsTechnical resource

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Synchronizing and Correlating Measurements to a Global Timebase with GPSTechnical resource

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FAQ

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Product-specific answers based on available technical information.

How does the PXI-6608 differ from the PXI-6602?

NI describes the 6608 as a functional superset of the 6602, adding an oven-controlled crystal oscillator.

Must the PXI-6608 be installed in slot 2?

Slot 2 is required to use its OCXO as the PXI backplane clock. In other slots, the counter timebase follows the existing backplane reference.

Can the PXI-6608 synchronize to GPS timing?

NI documents synchronization using an external GPS receiver providing PPS or DC-level IRIG-B signals, together with appropriate NI software and connections.