Chapter 8 Tutorial

Low-Level Signal Multiplexing and Switching

The 34901A and 34902A multiplexers have an additional relay, called a bank switch or tree switch, which helps reduce channel-to- channel noise (Cadj). The multiplexer channels are divided into two banks. The bank switch isolates one bank of channels from the other, effectively removing any parallel adjacent capacitance from the isolated bank. During a scan, the instrument automatically controls the bank switches.

Bank Switch

Cadj

Channel Source

Switch

Source

Bank 1

Bank Switch

Cadj

Channel Source

Switch

Source

DMM

Bank 2

If you are not using all of the channels on the multiplexer, divide the input signals equally between Bank 1 and Bank 2. For example, if you are multiplexing eight channels using the 16-channel multiplexer, use four channels in the lower bank and four channels in the upper bank. For even better noise immunity, leave one unused, grounded channel between each input channel.

Module

Bank 1

Bank 2

 

 

 

34901A

Channels 1 through 10

Channels 11 through 20

 

 

 

34902A

Channels 1 through 8

Channels 9 through 16

 

 

 

34908A

Channels 1 through 20

Channels 21 through 40

 

 

 

Module Reference

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Agilent Technologies 34970A manual Module Bank
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34970A specifications

Agilent Technologies 34970A is a versatile data acquisition and measurement system that has gained popularity in various industries, including research and development, manufacturing, and education. The primary purpose of the 34970A is to offer an efficient solution for data collection, monitoring, and analysis, which can significantly enhance productivity and accuracy in testing applications.

One of the main features of the 34970A is its modular design, allowing users to customize the system according to their specific measurement needs. The mainframe can accommodate up to three plug-in measurement modules, which can include various types of measurements such as analog, digital, temperature, and frequency. This modularity provides flexibility for users to tailor the system to their requirements, making it highly adaptable to different applications.

Another notable characteristic of the Agilent 34970A is its impressive channel configuration. The system can support up to 120 measurement channels when fully configured, enabling extensive data acquisition without the need for multiple devices. This capability is essential for applications requiring simultaneous monitoring of multiple parameters or locations.

The 34970A utilizes advanced signal processing technologies to ensure high-accuracy measurements. The internal 6.5-digit resolution multimeter provides precise readings, while the device also supports various input types, such as thermocouples and RTDs for temperature measurements. The ability to perform mathematical functions, such as summation and averaging, on the acquired data further enhances its usability.

For data storage and management, the Agilent 34970A features built-in memory for storing up to 20,000 readings. Users can also easily transfer data to a PC through the RS-232 interface or GPIB (IEEE 488) for further analysis and reporting. Additionally, it offers the capability to program automatic data logging and scheduling of measurements, which streamlines the testing process and reduces manual intervention.

In terms of user interface, the 34970A is equipped with a large graphical display that provides clear visualization of measurement data and easy navigation through settings and options. The menu-driven interface makes it accessible for users of all skill levels, simplifying the setup and operation of the device.

Overall, the Agilent Technologies 34970A stands out for its modularity, high channel capacity, advanced measurement technologies, and user-friendly interface. As a reliable and efficient data acquisition system, it is well-suited for a wide range of applications, making it an essential tool for engineers and technicians looking to enhance measurement precision and efficiency.
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