Specifications

2645A Specifications A

2645A AC Voltage Measurement Specifications

A-23.

Tables A-27 to A-29 provide 2645A specifications for the ac voltage measurement function.

Table A-27. 2645A AC Voltage General Specifications

Specification

Input Impedance

Maximum Crest Factor

Crest Factor Error

Common Mode Rejection

Maximum Input Voltage

Maximum Volt-Hertz Product

Temperature Coefficient

Accuracy at -20°C

DC Component Error

Characteristic

1 MΩ in parallel with 100 pF

3.0Maximum

2.0for rated accuracy

For non-sinusoidal input signals with crest factors between 2 and 3 and pulse widths 100 µs, add 0.2% to the accuracy specifications.

80dB minimum at dc, 50 Hz/60 Hz ±0.1%, 1 kΩ imbalance, Slow Rate

The lesser voltage of:

30V ac rms from any input terminal to earth.

30V ac rms from any terminal input to any other input terminal.

2x106 Volt-Hertz product on any range, normal mode input.

1x106 Volt-Hertz product on any range, common mode input.

Linear interpolation between 2 applicable points for temperatures between 28ºC and 60ºC, or -10ºC and 18ºC, e.g., if the applicable specification at

28ºC is 2% and the specification at 60ºC is 3%, then the specification at 40ºC is

(3%-2%)x(40-28)/(60-28)+2%=2.375%.

Multiply the -10°C to + 60°C accuracy specification by 2. After 1 hour warm-up. For accuracy between -10°C and -20°C, interpolate linearly.

The presence of a dc voltage will cause an indeterminate error in the reading of the ac voltage on the input.

A-19

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Fluke 2640A user manual 2645A AC Voltage Measurement Specifications, Table A-27 a AC Voltage General Specifications

2645A, 2640A specifications

The Fluke 2640A and 2645A are advanced bench multimeters that represent a significant leap in measurement technology, designed primarily for electrical engineers and technicians who require precision and reliability in their readings. These multimeters are built to cater to complex applications in manufacturing, research, and development.

One of the standout features of the Fluke 2640A and 2645A is their high accuracy. With specifications that can reach up to 0.0035% DC Voltage accuracy, users can trust that their measurements will be consistent and precise. This is especially critical in fields like automated test equipment (ATE) where exact measurements can be crucial for product quality and safety.

Both models incorporate a large, easy-to-read display, making it convenient for users to view measurement results clearly from a distance. They also feature a wide measurement range, capable of handling a variety of tasks, from basic voltage and current measurements to more complex tasks such as resistance and temperature measurements with appropriate sensors.

The multimeters also stand out with their advanced data logging capabilities. The Fluke 2645A, for instance, can store up to 10,000 readings, allowing for extensive data collection and analysis without the need for constant monitoring. This is beneficial for long-term studies or processes that require continual oversight.

Connectivity is another key characteristic. Both the 2640A and 2645A support USB and RS-232 interfaces, which enable easy integration with computers and other devices for seamless data transfer. This feature is important for engineers who rely on software for data analysis and visualization.

Another notable technology included in these models is the Fluke Connect app compatibility, which allows users to remotely monitor measurements from their smartphones or tablets. This capability provides added flexibility, enabling technicians to work hands-free while still keeping an eye on process measurements.

Additionally, the Fluke 2645A comes with a graphical display option, allowing users to visualize measurement trends over time. This graphical representation can be invaluable for diagnosing issues or observing patterns in data.

In conclusion, the Fluke 2640A and 2645A multimeters offer exceptional performance with their high accuracy, extensive data logging, connectivity options, and advanced visualization capabilities. These features make them indispensable tools for professionals in a variety of fields, ensuring that they can achieve reliable results in their measurement endeavors.