用于 34980A 多功能开关/测量单元的 Keysight 34921A 模块是一款通用性最强的多路复用器，适用于一般扫描。它在端接模块上具有低热偏置特性和内置热电偶参考，结合内置数字万用表使用，是理想的温度测量工具。这款高密度的多功能开关具有高达 100 通道/秒的扫描速率，适用于各类数据采集应用。
4 个带熔丝的附加输入（总共 44 个通道）可把最大 1A 的电流送至内部数字万用表，可以在不使用外部分流电阻器的情况下进行交流和直流电流测量。标准的 50针 Dsub 连接器可与标准电缆、端子块或大容量互连解决方案一起使用。
Keysight / Agilent 34921A 40-Channel Armature Multiplexer
The Agilent 34921A module for the 34980A Multifunction Switch/Measure Unit is the most versatile multiplexer for general purpose scanning. It has low thermal offset characteristics and a built-in thermocouple reference on the terminal block, making it ideal for temperature measurements directly to the internal DMM. The dense, multi-function switching with 100 channel/second scan rates addresses a broad spectrum of data acquisition applications.
Four additional fused inputs (44 channels total) route up to 1A of current to the internal DMM, allowing AC and DC current measurements without the need for external shunt resistors. Standard 50-pin Dsub connectors allow for use with standard cables, terminal blocks, or mass interconnect solutions.
The 34921T is a terminal block for the 34921A 40-channel multiplexer and the L4421A 40-Channel LXI armature multiplexer. It offers a built-in thermocouple reference junction that helps minimize errors due to thermal offset when you measure thermocouples. This terminal block is used for discrete wiring. It supports up to 20 AWG wire size typical for <100 connections or 24 AWG for >100 connections. The 34921T is a detachable terminal block with screw-type connections that provides a flexible method for connecting external wiring.
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