HYDRA

Service Manual

Table 5A-1. Error Codes (2635A) (cont)

Error

Error 9

Error A

Error b

Error C

Error d

Description

A/D Converter Not Responding

This error is displayed if communication cannot be established with the 6301Y Microcomputer (A3U9).

A/D Converter ROM Test Failure (A3U9)

All bytes of internal ROM for the 6301Y Microcomputer (A3U9) (including the checksum byte) are summed.

A/D Converter RAM Test Failure (A3U9)

Complementary patterns are alternately written to and read from each location of the 256 bytes of RAM internal to the 6301Y Microcomputer (A3U9).

A/D Converter Self Test Failure

The Analog Measurement Processor (A3U8) is programmed to do self test measurements.

Memory Card Interface Not Installed

The Microprocessor checks the system at power-up to determine whether the Memory Card Interface is installed.

5A-4. General Troubleshooting Procedures

Hydra allows for some fault isolation using self-diagnostic routines and descriptive error codes. However, these features are somewhat limited and do not provide in-depth troubleshooting tools.

Hydra incorporates a semi-modular design; determining modules not related to a problem constitutes the first step in the troubleshooting process.

As a first step, remove the Memory Card Interface (A6) from the Hydra Databucket (2635A). Refer to Section 3 of this manual for removal procedures. If removal of this assembly results in improved instrument operation, refer to the Memory Card Interface troubleshooting found later in this section.

Measuring the power supplies helps to isolate a problem further. Refer to Table 5A-2 and Figure 5A-1 for test point identification and readings. If power supply loading is suspected, disconnect the Display PCA at A1J2. If this action solves the loading problem, proceed to Display Assembly Troubleshooting elsewhere in this section. Otherwise, refer to Power Supply Troubleshooting.

Table 5A-2. Preregulated Power Supplies (2635A)

Preregulated Voltage

-8.9V -30.9V +9.2V -8.6V

Measurement Points

A1CR13-2 to A1TP1 A1TP4 to A1TP1 A1CR5 cathode to A1TP30 A1CR7 anode and A1TP30

Resulting Supply

VEE

VLOAD

VDD, VDDR

VSS

If the power supplies appear to be good, check the Display clock signal (DCLK (A1R85) and E clock signal (A2U4-1)). This clock signal is not symmetrical; it should be about +5.0 volts for about 325 nanoseconds and then near 0 volts for about 651 nanoseconds. If it is not correct at either measurement point, remove the Display Assembly and check the Display clock again at A1R85. If it is now correct, the problem is most likely on the Display Assembly. If it is still incorrect, the problem is probably in the Digital Kernel on the Main Assembly.

5A-6

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Fluke 2625A 5A-4. General Troubleshooting Procedures, Error Codes 2635A, Measurement Points, Resulting Supply
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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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