HYDRA

Service Manual

4-3. Performance Tests

When received, the instrument is calibrated and in operating condition. The following performance verification procedures are provided for acceptance testing upon initial receipt or to verify correct operation at any time. All tests may be performed in sequence to verify overall operation, or the tests may be run independently.

If the instrument fails any of these performance tests, calibration adjustment and/or repair is needed. To perform these tests, use a Fluke 5700A Multifunction Calibrator or equipment that meets the minimum specifications given in Table 4-1.

Each of the measurements listed in the following steps assumes the instrument is being tested after a 1/2 hour warmup, in an environment with an ambient temperature of 18 to 28 degrees Celsius and with a relative humidity of less than 70%.

Note

All measurements listed in the performance test tables are made in the slow reading rate unless otherwise noted.

Warning

Hydra contains high voltages that can be dangerous or fatal. Only qualified personnel should attempt to service the instrument.

4-4. Accuracy Verification Test

1.Power up the instrument and wait 1/2 hour for its temperature to stabilize.

2.Connect a cable from the Output VA HI and LO connectors of the 5700A to the VΩ and COM connectors on the Hydra front panel. Select the channel 0 function and range on Hydra and the input level from the 5700A using the values listed in Table 4-2. Press MON to measure and display the measurement value for channel 0. The display should read between the minimum and maximum values (inclusive) listed in the table.

4-5. Channel Integrity Test

Verify that the Accuracy Verification Test for channel 0 meets minimum acceptable levels before performing this test.

1.Switch OFF power to the instrument and disconnect all high voltage inputs.

2.Remove the Input Module from the rear of the instrument. Open the Input Module and connect a pair of test leads to the H (high) and L (low) terminals of channel 1. Reinstall the Input Module into the instrument.

3.Connect the ends of the test leads together to apply a short (0 ohms).

4.Reconnect power, and turn the instrument ON.

5.For channel 1, select the 2-terminal ohms function and 300-ohms range on Hydra.

Press MON and ensure that the display reads a resistance of less than or equal to 4.0Ω. (This test assumes that lead wire resistances are less than 0.1Ω.)

6.Open the ends of the test leads and ensure that the display reads "OL" (overload).

7.Press MON to stop the measurement.

4-4

Page 143 Page 145
Page 144
Image 144
Fluke 2635A, 2625A service manual Performance Tests, Accuracy Verification Test, Channel Integrity Test
Page 143 Page 145

2635A, 2625A specifications

The Fluke 2625A is a sophisticated data logger designed for a wide range of industrial and laboratory applications. This versatile instrument excels in capturing and monitoring temperature and voltage measurements with precision and reliability. One of its standout features is its ability to record data from various sensors, making it ideal for environments where comprehensive data acquisition is critical.

Equipped with a large LCD display, the Fluke 2625A provides clear and user-friendly access to real-time measurement data. Its graphical interface allows users to visualize trends and monitor readings easily, which significantly enhances usability. The device supports a variety of input types and can connect to thermocouples, RTDs, and other sensors, offering great flexibility for various measurement tasks.

The Fluke 2625A employs advanced measurement technologies that ensure accuracy in data logging. With a high sampling rate, it captures fast-changing signals while maintaining data integrity. The device features a built-in memory that allows for extensive logging, accommodating long-term monitoring tasks without requiring constant oversight. Users can set it to log data at specified intervals, offering customizable solutions for different monitoring needs.

Another significant characteristic of the Fluke 2625A is its robust communication capabilities. The device supports USB and RS-232 interfaces for easy connectivity with computers and other devices, making data transfer and analysis seamless. This feature is especially beneficial for users who need to compile or analyze large sets of data quickly.

Furthermore, the Fluke 2625A is designed with durability in mind. Its rugged construction makes it suitable for challenging environments, including those with high levels of vibration, dust, or moisture. This reliability ensures that the device can withstand the rigors of fieldwork while still delivering accurate measurements.

In summary, the Fluke 2625A is a powerful data logger that combines versatility, accuracy, and reliability. Its user-friendly interface, advanced measurement technologies, and robust design make it an essential tool for professionals in various industries, from manufacturing and HVAC to research and development. Whether monitoring temperature changes in a laboratory or assessing voltage levels in an industrial setting, the Fluke 2625A stands out as a trusted solution for effective data logging and analysis.
Top Page Image Contents