Some costly workarounds to such a problem include ordering spare instruments for each test station, hiring an outside calibration service, or construction of an in-house calibration laboratory. Individual instrument to their respective vendor’s factory for calibration. In most cases, test engineers are required to disassemble test stations and send each Typically, this has been viewed as a painful but necessary process involving system disassembly and downtime. Specifically, a traceable source is used by the instrument undergoing calibration to both adjust and verify the quality of measurement.
#LXI EXPERT SOFTWARE VERIFICATION#
Generally a major part of this confidence is achieved through instrument calibration and traceable verification standards. It is critical that test engineers are able to confidently rely on their measurement devices, and the integrity of the data they produce. Utilization of this approach is less accurate than hardware triggering however, Giga-bit Ethernet can provide synchronization times in the hundreds of nanosecond range which may be suitable for slower data acquisition rates common with thermocouple measurements. PTP provides multiple device synchronization while eliminating the need for external cabling between devices. The highest level of precision is obtained when hardware implementations assist in the time stamping of incoming and outgoing network packets or frames delay fluctuations can be in the nanosecond range with this approach.
#LXI EXPERT SOFTWARE DRIVER#
There are several ways in which PTP can be implemented ranging from user level software control, to kernel-level driver modifications, to hardware implementations utilizing dedicated FPGA devices.
Sub microsecond accuracy can be achieved with minimal network and local clock computing resources, and with little administrative attention from the user. The protocol is designed to enable the synchronization of systems that include clocks of different precision, resolution and stability.
PTP defines a precision clock synchronization protocol for networked measurement and control systems. This completely over-the-wire approach provides an ideal mechanism to synchronize multiple instruments separated by hundreds or thousands of meters. LAN synchronization, incorporating the IEEE-1588 Precision Time Protocol (PTP), highlights another fundamental advantage of LXI Class B devices that is ideal for distributed measurements. The Trigger Bus interface simplifies the process of distributing these signals, and when proper cabling and interconnects are used, ensures low channel-to-channel skew. Furthermore, the clock signals are often linked to a system clock such as IRIG-B or GPS for overall time correlation. Many data acquisition applications require a large number of parallel-channel instruments to be synchronized to a common clock or trigger pulse. Common topologies are supported including star, daisy-chain, and hybrid configurations providing the flexibility to distribute the trigger lines as dictated by the application requirements.Īdditional flexibility is realized with the addition of a star hub this device permits very tight trigger tolerances to be maintained throughout a large distribution network. This architecture permits individual lines to be configured as a source and/or receiver and supports external, time based or software generated triggering as well as clock distribution. The LXI Trigger Bus is required in LXI Class A devices, and provides the link between all devices in the test system for both triggering and clock signal distribution Deterministic trigger generation and propagation between multiple devices is accomplished with an eight-channel, multipoint low voltage differential signal (LVDS) interface. As a result of this requirement, the LXI standard defines a high performance trigger interface referred to as TriggerBus. The most accurate and deterministic synchronization mechanism between multiple devices involves the implementation of a hardware trigger interface. IEEE-1588 provides incredible advances in over the-wire synchronization however, there will always be instances where additional accuracy is required.
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