Chapter 4 Features and Functions

34908A 40-Channel Single-Ended Multiplexer

34908A 40-Channel Single-Ended Multiplexer

The module is divided into two banks of 20 channels each. All of the 40 channels switch HI only, with a common LO for the module.

The module has a built-in thermocouple reference junction to minimize errors due to thermal gradients when measuring thermocouples.

 

Channel Switches

 

01

 

20

Backplane

Com

Com

Switch

Internal

Bank Switch

DMM Input

99

98

 

 

21

Reference

40

 

Junction

 

Sensor

 

NOTES:

•Refer to the diagrams on page 20 to connect wiring to the module.

•Only one channel can be closed at a time; closing one channel will open the previously closed channel.

•This module cannot be used to directly measure current or any 4-wire measurements.

•When connecting thermocouples to the screw terminals on this module (not recommended due to the common LO configuration), be sure to provide electrical isolation between thermocouples to avoid current loops and subsequent measurement errors.

•Connections to ac line are not recommended unless you provide external transient suppression.

Maximum Input Voltage: 300 V (CAT I)

20 AWG Typical

 

 

 

 

 

 

 

Maximum Input Current: 1 A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum Switching Power: 50 W

 

 

 

 

 

 

 

 

6 mm

 

 

WARNING: To prevent electrical shock, use only wire that is rated for the highest voltage applied to any channel. Before removing a module cover, turn off all power to external devices connected to the module.

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Agilent Technologies 34970A manual 34908A 40-Channel Single-Ended Multiplexer
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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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