HYDRA

Service Manual

For the 300V range (Figure 2A-4), the HI signal is again scaled by A3Z4. The input is applied to pin 1 of A3Z4, and a 1000:1 divider is formed by the 10-MΩand 10.01-kΩresistors when switches S3 and S9 are closed in A3Z4. The attenuated HI input is then sent through internal switch S10 to the passive filter and the a/d converter. LO is sensed through analog processor switch S18 and resistor A3R34.

 

S2

 

 

A3R11

 

 

 

A3K17

 

 

 

INPUT HI

 

 

 

A3R10

 

 

 

A3Z4

 

 

 

10M

 

 

 

S3

 

 

 

S9

 

 

 

 

S10

PASSIVE

 

 

 

HIGH

 

 

FILTER

 

 

 

A3Z4

 

 

A/D

10.01k

A3R34

 

 

 

 

 

 

 

 

LOW

A3K16

 

 

 

INPUT LO

 

 

 

 

 

 

s14f.eps

Figure 2A-4. DC Volts 300V Range Simplified Schematic (2635A)

2A-54.Ohms and RTDs

Resistance measurements are made using a ratio ohms technique, as shown in Figure 2A-5. A stable voltage source is connected in series with the reference resistor in A3Z4 and the unknown resistor. Since the same current flows through both resistors, the unknown resistance can be determined by multiplying the ratio of the voltage drops across the reference and the unknown resistors by the known reference resistor value.

2A-26

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Fluke 2635A, 2625A service manual 2A-54.Ohms and RTDs
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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.

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