Appendices

E

Binary Upload of Logged Data (LOG_BIN?) (2625A only)

The raw data output array contains the information listed below. Note that the number of floating point values is equal to the number of channels in use, plus one. (The totalizer count is always present in the data, and is stored as a floating point number.)

∙Time stamp (BCD format)

byte0: hours

byte1: minutes

byte2: seconds

byte3: month

byte4: date

byte5: year

∙Temperature units, measurement rate, and I/O

byte6: temperature units and rate (0x10 bit means degrees Fahrenheit, else Centigrade; 0x01 bit means fast rate, else slow rate)

byte7: Alarm outputs

byte8: Digital I/O

∙Totalizer value as 32-bit single-precision IEEE floating point number stored using the byte ordering shown below. The format of this number is explained under "Floating Point Conversion".

byte 9: MMSB of float

byte 10: MLSB of float

byte 11: LMSB of float

byte 12: LLSB of float

∙Measurement data; only defined channels are included (exactly like LOG?query); same floating point format, but with a wider range of values. NaN (Not a Number) is used to indicate open thermocouple, and plus or minus Inf (infinity) to indicate overload. The bit values for NaN and Inf are explained in the next section.

byte 13: MMSB of float

byte 14: MLSB of float

byte 15: LMSB of float

byte 16: LLSB of float

bytes 17-20: Second measurement result, if any

bytes 21-24: Third measurement result, if any

..........

Since the ASCII decoding (explained above) creates data multiples of three in length, it is possible that there will be one or two unused bytes at the end of the decoded byte stream.

Floating Point Conversion

ANSI/IEEE Std 754-1985, "IEEE Standard for Binary Floating-Point Arithmetic," describes the single-precision floating point format used to return measurement data. This standard defines the format for single-precision floating point as:

X= (-1) s 2(e-127)x 1.m where

s = sign

e = exponent m = mantissa

E-3

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Fluke 2620A, 2625A user manual Floating Point Conversion, Appendices
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2625A, 2620A 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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