HYDRA

Service Manual

Lack of outguard-to-inguard communication activity may be due to improper operation of circuit elements other than A3U9. Using a high input impedance oscilloscope or timer/counter, check for proper Analog Processor (A3U8) crystal oscillator operation. A 3.84-MHz sine wave (260 ns period) should be present at A3U8 pin 37 with respect to A3TP9.

Check the A/D Converter voltage reference:

A3TP12 to A3TP11 (across A3C12) = +1.05V (+0.10V, -0.02V)

Setup the instrument to measure ohms on the 300Ω range. Monitor ohms on a channel with an input of approximately 270Ω. Check that the Analog Processor IC (A3U8) is making A/D conversions. The integrator output waveform at A3TP13 (referenced to A3TP9) should resemble the waveform shown in Figure 5A-6.

 

A3TP13 TO A3TP9

 

0

1V/DIV

5 mS/DIV

 

s48f.eps

Figure 5A-6. Integrator Output (2635A)

Check for channel relay operation by setting up a channel and selecting and de-selecting monitor measurement mode. One or more relays should click each time the monitor button is pressed or channels are changed.

In general, check that the relays are getting the proper drive pulse signals for specific functions and channels and that they are in the correct position.

5A-11. DC Volts Troubleshooting

Setup the instrument to measure a specific channel on the 300 mV or 3V range, and apply an input to that channel. Then trace the HI signal (referenced to the input channel LO terminal) as described in Table 5A-4.

If the input HI path traces out properly, remove the input from the channel and trace continuity through the LO path. Check among A3L4-A3L24, A3K1-A3K14, A3R35, A3R43, and A3U8 pin 11.

5A-16

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Fluke 2625A service manual 5A-11. DC Volts Troubleshooting, Integrator Output 2635A
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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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