Preparing for Operation 2

Instrument Preparation

DC Power

2-7.

The instrument operates from any dc voltage between 9 and 16 volts. Power consumption is a nominal 6 watts. To connect the ALARM/TRIGGER I/O connector to the rear panel, complete the following procedure:

1.Remove the ALARM/TRIGGER I/O connector from the packing material or instrument rear panel.

2.Loosen the wire clamp screw for the associated terminal.

3.Feed the wire into the gap between the connector body and the wire clamp.

4.Tighten the wire clamp; do not overtighten and crush the wire.

5.Repeat steps 2 through 4 for each wire.

6.Insert the connector in the rear panel.

Grounding and Common Mode Voltage

2-8.

Connect the instrument chassis to a good earth ground (Figure 2-2) to prevent a common mode voltage from gradually raising the chassis to a high potential. For example, if you measure the voltage across a resistor in a 50V dc circuit, the instrument reads the resistor voltage and ignores the 50V dc common mode voltage. Since the impedance between the channel’s inputs and chassis ground is not infinite, a common mode voltage gradually leaks to the chassis ground. A good earth ground prevents the chassis from rising to the common-mode voltage (50V dc in this case).

Universal Input Module Connections

2-9.

Connections to the Universal Input Module (Figure 2-3) use the H (high) and L (low) pairs of terminals for each of the 20 analog input channels. Complete the following procedure to make connections.

PWarning

To avoid electric shock, remove all inputs from live voltages before opening this module. Input wiring may be connected to live voltages.

1.Remove the module from the rear panel by pressing the release tab on the bottom of the module and pulling the module free of the connector.

2.Loosen the two large screws on top and open the module.

3.Connect the wires to H (high/positive) and L (low/negative) for each channel.

4.Thread these wires through the strain-relief pins and out the back of the module.

2-7

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Fluke 2640A, 2645A user manual DC Power, Grounding and Common Mode Voltage, Universal Input Module Connections
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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.
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