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Fluke 2645A, 2640A user manual Alarms, Channel Monitoring, Digital I/O, Totalizer

Models: 2645A 2640A

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2640A/2645A NetDAQ

Users Manual

Alarms

1-7.

Two alarms, Alarm 1 and Alarm 2, can be applied to any configured channel. An alarm condition occurs when a measurement falls below a low alarm value or rises above a high alarm value. You can use alarms to trigger scanning (see “Alarm Triggering”) and to set a Digital I/O line to a logic low (see “Digital I/O” below). NetDAQ Logger displays and records alarm conditions.

If you apply Mx+B scaling as part of the channel configuration, the instrument bases the alarms on the scaled values. When any configured channel is in alarm, the ALARM annunciator is on dim, or bright if a channel in alarm is being used as an Alarm Trigger. When a channel is in alarm, the rear-panel Master Alarm output is asserted (logic low). NetDAQ Logger displays and records alarm conditions.

Channel Monitoring

1-8.

Channel monitoring takes place at the front panel of the instrument. Use the front panel MON key and arrow keys to select a channel for monitoring. NetDAQ Logger also allows the selection of a channel to monitor during scanning. For an example of a front panel display of the instrument during monitoring, see Figure 1-3. The channel monitoring display updates once per second (nominal).

Digital I/O

1-9.

Eight general-purpose open-collector Transistor-Transistor Logic (TTL) digital input/output (I/O) lines are available at the instrument rear-panel DIGITAL I/O connector, terminals 7 through 0 (Figure 1-4). A logic low externally applied to an I/O line is an input; a logic low internally set by the instrument is an output. An output logic low condition takes precedence over an input logic high condition. When the I/O lines are used as inputs, they signal an external condition that can be correlated to the data measurements.

NetDAQ Logger displays and records the status of the Digital I/O as the decimal equivalent of the eight binary bits. For example, 11111111 (DIO7 to DIO0) is represented by decimal 255; 00001111 is represented by decimal 15.

The instrument can display the Digital I/O status in binary format at the front panel with updates each second.

Totalizer

1-10.

The totalizer input counts contact closures or voltage transitions with a maximum count of 4,294,967,295. The connections for the totalizer input line are at the instrument rear panel DIGITAL I/O connector, terminals Σ and GND (Figure 1- 4). The instrument continuously detects the totalizer input on the rear panel independently from instrument scanning and other activities. If the Totalizer

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Fluke 2645A, 2640A user manual Alarms, Channel Monitoring, Digital I/O, Totalizer
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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.