Chapter 3 Features and Functions

Measurement Configuration

DC Input Resistance

Normally, the multimeter’s input resistance is fixed at 10 MΩ for all dc voltage ranges to minimize noise pickup. To reduce the effects of measurement loading errors, you can set the input resistance to greater than 10 GΩ for the 100 mVdc, 1 Vdc, and 10 Vdc ranges.

Applies to dc voltage measurements and is disabled for all other functions.

 

 

 

Input Resistance

Input

Resistance

 

 

 

 

100mV, 1V, 10V ranges

100V,

1000V ranges

3

Fixed

Resistance

ON (default)

10 MΩ

10 MΩ

 

Fixed

Resistance

OFF

Ω

10 M

Ω

 

 

 

 

> 10 G

 

 

 

 

 

 

 

 

 

 

•The input resistance setting is stored in volatile memory; the multimeter selects 10 MΩ (for all dc voltage ranges) when power has been off or after a remote interface reset.

• Front-Panel Operation: Select from the menu the 10 MΩ mode (fixed resistance for all dc voltage ranges) or the >10 GΩ mode. The default is 10 MΩ .

3:INPUT R (MEAS MENU)

•Remote Interface Operation: You can enable or disable the automatic

input resistance mode. With AUTO OFF (default), the input resistance is fixed at 10 MΩ for all ranges. With AUTO ON, the input resistance is set to >10 GΩ for the three lowest dc voltage ranges. The CONFigure and MEASure? commands automatically turn AUTO OFF.

INPut:IMPedance:AUTO {OFFON}

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Agilent Technologies 34401A manual DC Input Resistance, Input R Meas Menu
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34401A specifications

Agilent Technologies 34401A is a highly reputable digital multimeter (DMM), renowned for its accuracy, versatility, and performance in a wide range of measurement applications. First introduced in the early 1990s, the 34401A has become a staple in laboratories, manufacturing environments, and educational institutions due to its robust build and comprehensive features.

One of the standout characteristics of the 34401A is its impressive accuracy, boasting a basic DC voltage accuracy of 0.0035%, making it ideal for precise measurements in electronic testing. The multimeter offers a wide range of measurement capabilities, including voltage (DC and AC), current (DC and AC), resistance, frequency, and continuity test, making it a highly versatile tool for engineers and technicians.

The 34401A utilizes a 6½-digit resolution, enabling the user to measure small changes in electrical signals with remarkable precision. With a sampling rate of up to 1000 readings per second, it can handle dynamic test requirements, providing timely results without sacrificing measurement integrity.

In terms of connectivity, the Agilent 34401A includes a GPIB (General Purpose Interface Bus) for remote operation, allowing users to automate their testing processes and integrate the multimeter easily into larger measurement systems. This feature is particularly beneficial in automated test environments, where speed and accuracy are paramount.

Additionally, the DMM incorporates advanced measurement functions, such as statistical analysis, including mean, standard deviation, and minimum/maximum readings, which provide users with valuable insights into their data. The instrument's user-friendly interface, complete with a clear digital display and intuitive controls, enhances usability and ensures that users can easily navigate its various functions.

Robust software support further extends the capabilities of the Agilent 34401A. It is compatible with a range of software tools for data logging and analysis, enabling users to efficiently document and analyze their measurements over time.

In summary, Agilent Technologies 34401A stands out in the realm of digital multimeters due to its high accuracy, extensive measurement functionalities, and user-friendly features. Whether for research and development, quality control, or educational purposes, the 34401A remains a preferred choice for professionals demanding reliable and precise measurement solutions. Its enduring legacy in the industry speaks to its performance and reliability, making it an essential tool for anyone involved in electronic testing and measurement.
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