Alarm Outputs Connections, DC Power

Preparation for Use 1

Measurement Connections

Alarm Outputs Connections

The eight-terminal rear panel ALARM OUTPUTS connector (Figure 1-7) serves three functions: DC power, alarm outputs, and external trigger input. Each is described below.

TerminalFunction

+Positive Input for DC Operation

–Negative Input for DC Operation

0Channel 0 Alarm Output

1Channel 1 Alarm Output

2Channel 2 Alarm Output

3Channel 3 Alarm Output

TR	External Trigger Input
	Ground Terminal

ALARM OUTPUTS

+– 0 1 2 3 TR

9-16 V

DC PWR

op07f.eps

Figure 1-7. ALARM OUTPUTS connector

DC Power

The instrument may be powered by a dc input between 9 volts and 16 volts allowing remote operation from various battery sources or dc power supplies. Connect the positive lead of the power supply to the + terminal and the negative lead to the - terminal. If the instrument is going to measure voltages greater than 50 volts dc or ac rms, also connect a ground wire between the rear panel ground lug and a suitable earth (safety) ground point (see Figure 1-4).

Alarm Outputs

Terminals 0, 1, 2, and 3 are used to signal alarm conditions for channels 0, 1, 2, and 3 respectively using transistor-transistor-logic (TTL) voltage levels, referenced to the GROUND terminal. Logic high is >+2.0 to <+5.5V dc; a logic low is 0.0 to +0.8V dc. If a channel is not in alarm, the voltage output at a connector terminal is a logical high (nominal +5V dc); if a channel is in alarm, the output is a logical low (nominal +0.7V dc). Alarm outputs are set at the end of a scan interval. See Setting the Alarms in Chapter 2 for more information. If the instrument is operated over the RS-232 computer interface, the ALARM OUTPUTS can be assigned to I/O functions (assuming channels 0, 1, 2, and 3 are not configured for alarms). See the ALARM_DO_LEVEL command, described in Chapter 4.

External Trigger Input

An external trigger input can serve the same function as the front panel SCAN key. A contact closure between TR and GROUND or a TTL logical low applied to TR (referenced to GROUND), will cause the instrument to scan. When the trigger input is removed, scanning will stop. Scanning is initiated on the falling edge of the trigger signal, which must be held logic low for at least 5 us and have been preceded by at least 100 ms of logic high. Logic high is +2.0 to +7.0V dc; a logic low is -0.6 to +0.8V dc. See "Scan Triggering Options" in Chapter 2 for more information.

Perform the following procedure to make connections to the ALARM OUTPUTS connector:

1. Remove the connector from the rear panel.

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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.

Fluke 2635A user manual Alarm Outputs Connections, DC Power, External Trigger Input

Models: 2635A