HYDRA

Service Manual

∙A good connection with SMT requires only enough solder to make apositive metallic contact. Too much solder causes bridging, while toolittle solder can cause weak or open solder joints. With SMT, theanchoring effect of the through-holes is missing; solder provides theonly means of mechanical fastening. Therefore, the pca must beespecially clean to ensure a strong connection. An oxidized pca padcauses the solder to wick up the component lead, leaving littlesolder on the pad itself.

Refer to the Fluke "Surface Mount Device Soldering Kit" for a complete discussion of these techniques.

5-3. Error Codes

At reset, the Hydra software performs power-up self-tests and initialization of ROM, NVRAM, Display, EEPROM, and measurement hardware. Self-test failures are reported on the display with "Error" in the left display and an error code (1-9,A,b,C) in the right display.

Several of these error codes might never be displayed. Certainly, errors 4 and 5, which signify a faulty or dead display, could not be reported in the normal (displayed) manner. Other errors might not appear on the display. Therefore, the following additional methods exist for accessing error information:

∙The computer interfaces can be used to determine self-check statususing the *TST? query. Refer to Section 4 of the Hydra Users Manualfor a description of the *TST? response. Note that the extent of theerror-producing damage could also cause the instrument to halt beforethe computer interfaces are operational.

∙The POWERUP? computer interface command can be used to determinewhich errors were detected at power-up. POWERUP? uses the sameresponse format as *TST?; refer to *TST? in Section 4 of the HydraUsers Manual.

∙The keyboard scan lines (A1U4, SWR1-5), which are also used as statusindicators, can be checked as a last resort for accessing errorinformation. The software sets SWR1 (A1U4-21) low to indicate thatthe basic operation of the processor, ROM, and ROM decode circuitryis intact. SWR2 (A1U4-22) is set low if the ROM (A1U8) check passes.SWR3 (A1U4-23) is set low if the external NVRAM (A1U3) check passes,and SWR4 (A1U4-24) is set low if the internal RAM (A1U4) checkpasses. Then, if the display self-check passes, SWR5 (A1U4-25) isset low to indicate that the display is operational.

Table 5-1 describes the error codes.

Note

Each error code is displayed for 2 seconds.

5-4

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Fluke 2635A, 2625A service manual Error Codes, Each error code is displayed for 2 seconds
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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.
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