HYDRA

Service Manual

Figure 5-7 shows the timing relationships of the 6303Y Microprocessor lines LIR* and WR* to the system clock (E) and the address lines A0..A15. The ROM and NVRAM Chip Enables correspond to the active (low) region shown for the address lines.

If the instrument powers up without any errors, but does not recognize front-panel button presses or computer interface commands, the problem may be in the Counter/Timer (A1U2). Normally, this component generates a regular 50-millisecond interrupt at the IRQ* output (A1U2-9). If this output is low (and never goes high), the Microprocessor (A1U4) is failing to recognize the interrupt or the microprocessor interface to A1U2 is not working correctly. Also check output A1U2-6 for a 10-Hz square wave. If this output is not correct, check for the E clock at A1U2-17, and verify the microprocessor interface signals (CNTR*, D0 .. D7, A0 .. A2, R/W*, and RESET*.)

 

t cyc

 

 

2.4V

 

 

PWEL

PWEH

E

0.8V

 

 

 

 

tAD

t AH1

 

tEr

tEf

A 0~A15 ,

2.4V

 

R/W

0.8V

 

 

 

 

 

tAH2

 

 

t HRW

 

t RWD

PW RW

 

 

RD,WR

 

2.4V

0.8V

 

 

 

t HW2

 

t DDW

t HW1

MCU Write

 

2.4V

D0 ~ D7

 

0.8V

 

 

 

t ACC

t DSR

 

 

t HR

MCU Read

 

2.0V

D0 ~ D7

 

0.8V

 

 

 

t DLR

t HLR

 

 

LIR

 

 

 

 

0.8V

 

 

s38f.eps

Figure 5-7. Microprocessor Timing

5-20

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Fluke 2635A, 2625A service manual Microprocessor Timing
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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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