Chapter 4 Features and Functions

Scanning With External Instruments

In this configuration, you must set up a scan list to include all desired multiplexer or digital channels. Channels which are not in the list are skipped during the scan. The instrument automatically scans the list of channels in ascending order from slot 100 through slot 300.

For an externally-controlled scan, you must either remove the internal DMM from the 34970A or disable it (see “Internal DMM Disable” on page 145). Since the internal DMM is not used, readings from multiplexer channels are not stored in internal reading memory.

External connections are required to synchronize the scan sequence between the 34970A and the external instrument. The 34970A must notify the external instrument when a relay is closed and settled (including channel delay). The 34970A outputs a Channel Closed pulse from pin 5 on the rear-panel connector (see previous page). In response, the external instrument must notify the 34970A when it has finished its measurement and is ready to advance to the next channel in the scan list. The 34970A accepts a Channel Advance signal on the External Trigger input line (pin 6).

•You can configure the event or action that controls the onset of each sweep through the scan list (a sweep is one pass through the scan list). When the internal DMM is removed (or disabled), the default scan interval source is “timer”. For more information, refer to “Scan Interval” on page 80.

•You can configure the event or action that notifies the 34970A to advance to the next channel in the scan list. Note that the Channel Advance source shares the same sources as the scan interval. However, an error is generated if you attempt to set the channel advance source to the same source used for the scan interval.

•You can specify the number of times the instrument will sweep through the scan list. When the specified number of sweeps have occurred, the scan stops. For more information, refer to “Scan Count” on page 86.

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Agilent Technologies 34970A manual Scanning With External Instruments
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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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