The NI 4022 is an accessory PXI module that consists of a high-speed, high-precision amplifier that conditions signals for acquisition by measurement devices. This document also contains information on how to use and program the module.

6线保护和电流pxi放大器模块—pxi‑4022由一个高速、高精度放大器组成，用于调节采集信号。 pxi‑4022的保护功能使得用户可以使用6线电阻测量方法来测量复杂印刷电路板或电缆测试应用中的并联电阻。

6-Wire Guard and Current PXI Amplifier Module—The PXI‑4022 consists of a high-speed, high-precision amplifier that conditions signals for acquisition. With the guarding functionality, you can make 6‑wire resistance measurements for resistors connected in parallel on complex printed circuit board layouts or cable test applications.

PXI-4022具备不同的应用其中一个最常见的应用是小电流的前置放大器。 您可以使用PXI-4022测试很小的电流．PXI-4022通过对电流的放大，以及把电流按照设备不同的量程配置线性转化成0 to ±10 V 的电压，这样的一个电压能够通过DMM准确的测量，然后在软件中再转化成电流．. 因为PXI-4022是将电流转化成电压，所以DMM中任何测量电压的例子都能够使用．只有一小部分需要改动结合PXI-4022使用DMM。 您只需使用niDMM 4022 Control.vi就可以配置PXI-4022。 这 …

2023年11月22日 · The NI PXI-4022 guard and current amplifier module implements a feedback ammeter with less than 20 μV of burden voltage on its 100 nA current range. When combined with the NI PXI-4071 DMM (measuring the output voltage), you can possibly achieve precise current measurement sensitivity at 0.5 pA or better.

Description: 6-Wire Guard and Current Amplifier. Manufacturer: National Instruments Corporation.

2024年5月4日 · The PXI-4022 is not supported by the nidmm Python module. In order to control it via Python you will need to call the raw C function niDMM_ 4022 Control(). Python offers multiple mechanisms for this, e.g. ctypes.

With the guarding functionality, you can make 6-wire resistance measurements for resistors connected in a network, on complex printed circuit board layouts, or cable test applications. For low-current measurements, the NI PXI-4022 amplifier and high-precision resistors create a feedback current amplifier.

2023年10月22日 · ni pxi-4022 保护和电流放大器模块可在 100 na 电流范围内实现负载电压低于 20 μv 的反馈电流表。 当与 NI PXI-4071 DMM（测量输出电压）结合使用时，您可以实现 0.5 pA 或更高的精确电流测量灵敏度。