Chapter 4 Features and Functions

General Measurement Configuration

Custom A/D Integration Time

Integration time is the period of time that the instrument’s analog-to- digital (A/D) converter samples the input signal for a measurement. Integration time affects the measurement resolution (for better resolution, use a longer integration time) and measurement speed (for faster measurements, use a shorter integration time).

•Integration time is specified in number of power line cycles (PLCs). Select from 0.02, 0.2, 1, 2, 10, 20, 100, or 200 power line cycles. The default is 1 PLC.

•Only the integral number of power line cycles (1, 2, 10, 20, 100, or 200 PLCs) provide normal mode (line frequency noise) rejection.

•You can also specify integration time directly in seconds (this is called aperture time). Select a value between 400 ∝s and 4 seconds, with 10 ∝s resolution.

• For temperature measurements, the integration time is fixed at

4

1 PLC.

•The only way to control the reading rate for ac measurements is by changing the channel delay (see page 88) or by setting the ac filter to the highest frequency limit (see page 114).

•The specified integration time is used for all measurements on the selected channel. If you have applied Mx+B scaling or have assigned alarms to the selected channel, those measurements are also made using the specified integration time. Measurements taken during the Monitor function also use the specified integration time.

•The following table shows the relationship between integration time, measurement resolution, number of digits, and number of bits.

Integration Time

Resolution

Digits

Bits

 

 

 

 

0.02 PLC

< 0.0001 x Range

41⁄2 Digits

15

0.2 PLC

< 0.00001 x Range

51⁄2 Digits

18

1 PLC

< 0.000003 x Range

51⁄2 Digits

20

2 PLC

< 0.0000022 x Range

61⁄2 Digits

21

10 PLC

< 0.000001 x Range

61⁄2 Digits

24

20 PLC

< 0.0000008 x Range

61⁄2

Digits

25

100 PLC

< 0.0000003 x Range

61⁄2

Digits

26

200 PLC

< 0.00000022 x Range

61⁄2

Digits

26

103

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Agilent Technologies 34970A manual Custom A/D Integration Time, Plc
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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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