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這PXI國家儀器公司-2548(零件號:778572-48)是一個通用交換模塊有單刀雙擲獨立繼電器(SPDT)。這鎳PXI-2548 開關模塊通過控制一系列繼電器來改變每個通道上的電阻，從而再現(xiàn)基于電阻的裝置的行為。該器件能夠快速、精確地波動電阻，分辨率低至0.25ω，非常適合硬件在環(huán)(HIL)認證中重現(xiàn)環(huán)境條件。每個PXI可編程電阻模塊都利用前面板上的37針D-SUB連接器來訪問所有通道，此外還有一個2x2微型連接器，用于與PXI數(shù)字萬用表(DMM)簡單關聯(lián)。驅(qū)動軟件提供了一個基本的用戶界面，可以確認溫度或電阻單位的輸入，并配置每個通道的電阻，而不需要專門控制單個繼電器。

在……上倪PXI-2548可編程電阻是模擬基于電阻的信息源和輸出行為的測試模塊，包括:電位計、RTD、分壓器和電橋元件。每個通道上的總電阻(在前端連接器端子上估算)是通過利用繼電器操縱電路路徑電阻來控制的，繼電器通過分立的電阻專門布線。PXI可編程電阻模塊自動控制通過I/O連接器顯示的電阻估計值，支持在HIL認證中使用，在各種模擬框架條件下執(zhí)行快速框架測試。

該型號提供2.7 GHz的帶寬、2.7 GHz %3C1.0 dB的插入損耗(典型值%3C0.7 dB)、2.7 GHz %3C1.7的VSWR(典型值%3C1.5)和板載繼電器計數(shù)。

The National Instruments PXI-2548 (Part number: 778572-48) is a General-Purpose Switching Module that has single-pole and double-throw, independent relays (SPDT). The NI PXI-2548 Switching Module reproduces the conduct of resistance‐based gadgets by controlling a progression of relays that varies resistance over each channel. The capacity to rapidly and precisely fluctuate resistance, with resolution down to 0.25 Ω, makes this gadget well‐suited for reenacting environmental conditions in hardware‐in‐the‐loop (HIL) approval. Each PXI Programmable Resistor Module utilizes a 37‐ pin D‐SUB connector on the front board to give access to all channels and additionally has a 2x2 Micro‐Fit connector for simple association with a PXI Digital Multimeter (DMM). The driver software gives a basic UI that acknowledges inputs to units of temperature or resistance and configures the resistance over each channel, without expecting to specifically control individual relays.

On the NI PXI-2548, programmable resistors are test modules that imitate the conduct of resistance-based information sources and outputs, including: potentiometers, RTDs, voltage dividers, and bridge elements. The total resistance over each channel, estimated over the front connector terminals, is controlled by manipulating the circuit path resistance by utilizing relays to specifically route through discrete resistors. PXI Programmable Resistor Modules automatically control the estimations of resistance showing up through an I/O connector, empowering utilization in HIL approval, which performs fast framework tests amid an assortment of simulated framework conditions.

This model offers 2.7 GHz of bandwidth, Insertion loss at 2.7 GHz <1.0 dB (typical <0.7 dB), VSWR at 2.7 GHz <1.7 (typical <1.5) and onboard relay counting.