2635A

Users Manual

Caution

Do not exceed the specified input voltage levels or equipment damage could result.

Measurement Connections

W Warning

To avoid electric shock:

∙When the input module is installed, consider all channels with connections as accessible terminals that may be hazardous live.

∙Disconnect the input module before touching or changing external wiring.

Input connections include the front panel terminals (channel 0), rear panel connections using the Universal Input Module (channels 1 through 20), and I/O functions using the ALARM OUTPUTS and DIGITAL I/O connectors. The instrument is protected from channel configuration errors. For example, accidentally applying 300V ac to a channel configured for resistance measurements will not damage the instrument.

Using Shielded Wiring

Shielded wires and sensors (such as thermocouples) should be used in environments where "noisy" voltage sources are present. When shielded wiring is used, the shield is normally connected to the L (low) input terminals for each channel. Alternate configurations should be examined for each equipment application.

Crosstalk

The instrument allows the mixing of various types of measurement. A phenomenon known as crosstalk can cause one signal to interfere with another and thereby introduce measurement errors. To reduce the effects of crosstalk in making measurement connections, do the following:

∙Keep any input wiring carrying ac volts signals physically separate from the input wiring of other sensitive channels.

∙Avoid connecting inputs with ac volts signals adjacent to sensitive channel inputs. Leave unconnected channels between the inputs, if possible.

∙Avoid connecting inputs with ac volts signals to any channel 10 numbers away from a sensitive channel (i.e., 4-terminal input channels).

∙Avoid tying L (low) or (especially) H (high) inputs of a sensitive channel to earth (chassis) ground. This is very important in resistance measurements.

∙Avoid high-source impedances on sensitive channels, or minimize the capacitance of the sensitive channel to earth (chassis) ground for high impedance inputs.

∙Whenever high ohms measurements (>10 kΩ) must be made accurately, avoid connecting any inputs carrying ac volts signals.

Measurement errors introduced by crosstalk are discussed in Appendix B.

Universal Input Module Connections

For channels 1 through 20, use the H (high) and L (low) inputs on the rear panel Universal Input Module, as shown in Figure 1-5. Perform the following procedure to make connections to the Universal Input Module:

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Fluke 2635A user manual Measurement Connections, Using Shielded Wiring, Crosstalk, Universal Input Module Connections
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2635A specifications

The Fluke 2635A is a highly advanced multichannel data acquisition system designed for engineers and technicians requiring precision and versatility in their measurement tasks. This instrument excels in monitoring and capturing data from various sources, making it a valuable tool in laboratories, production environments, and field applications.

One of the standout features of the Fluke 2635A is its ability to support up to 20 measurement channels. Users can simultaneously monitor multiple signals, which is crucial for complex testing scenarios where numerous variables need to be tracked. The device is equipped with a 6.5-digit precision measurement capability that ensures high accuracy and resolution in readings. This level of precision is particularly beneficial in applications such as environmental monitoring, research and development, and industrial process control.

The unit incorporates a variety of measurement modes, including voltage, current, temperature, and resistance, making it exceptionally versatile. The Fluke 2635A not only handles standard signals but also integrates with various transducers, providing extensive compatibility for users engaged in diverse testing applications.

To enhance data management, the Fluke 2635A offers advanced data logging capabilities. Data can be stored internally or transferred to external devices for further analysis. The internal memory can accommodate extensive datasets, which can be crucial in long-term monitoring tasks. Integration with external software enables users to analyze and visualize data effectively, allowing for informed decision-making based on comprehensive results.

The user interface is designed for ease of use, featuring a large, bright LCD display that clearly presents measurements and status information. The device is also equipped with a simple navigation system, allowing users to switch between channels and measurement types without hassle.

In terms of construction, the Fluke 2635A is built to withstand rigorous environments. It features a robust design that ensures reliability and durability, making it suitable for both laboratory settings and field operations. Furthermore, the device supports a wide temperature range, thus enabling usage in diverse conditions.

Overall, the Fluke 2635A is a powerful and flexible instrument that provides precise measurements across multiple channels, supporting a wide range of applications. Its advanced technology, combined with user-friendly features, makes it an essential tool for professionals in various fields. The combination of accuracy, flexibility, and durability solidifies its standing as a trusted choice for data acquisition and monitoring tasks.
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