Setting the Mx+B Scaling, Examples

Front Panel Operations 2

Setting Operating Conditions

Setting the Mx+B Scaling

Perform the procedure in Figure 2-14 to set the Mx+B scaling for any configured channel. In preparation, the instrument must be in the inactive mode (not scanning or monitoring) and the desired channel must be configured with a measurement function (see Figures 2-4 to 2-9) and selected (see Figure 2-3). To exit at any time, press the C key; however, any Mx+B parameters previously entered will remain. Scaling allows a measurement value (x) to be modified with a fixed multiplier (M) and a fixed offset (B). A channel with scaling other than the default of 1x+0 will display Mx+B when the channel is selected. When scaling is used, only a number is displayed; function identifiers such as ºC, Hz, Ω, VAC, and VDC are removed. If the results from Mx+B scaling are nonsense, double check the signs and multiplier values for M and B.

Examples

Multiplier. If a pressure transducer provides 100 mV for 100 PSI, 200mV dc for 200 PSI, etc., the instrument would read directly in PSI with a multiplier of 1000, or M=+1k and B=000.00. For example, a PSI of 156.98 would display the number 156.98.

Offset. If you are monitoring line voltage of 115V ac and you want the instrument to display the variations above and below 115V ac instead of the actual voltage, the instrument would display the differences by subtracting -115 from the measurements, or B=-115.00 (M=1.0). For example, 117.21V ac would display only the number 2.21; 113.45V ac would display the number -1.55.

Multiplier and Offset. If the instrument is measuring temperature using the ºF scale, but you want it to display the measurements in ºC, the conversion formula ºC=5/9(ºF-32), rewritten in decimal ºC=.55555ºF-17.777, could make the conversion with M=+.55555 (entered as +555.55m) and B=-017.78. For example, 72.2 ºF would display the number 22.28.

Restrictions

Linearity. The transfer characteristic of the transducers or measurement modifications must be linear, with fixed multipliers (M) and fixed offsets (B).

Overload (OL) Display. The decimal point location and scaling (m, X1, k, M) selected for the "B" value determines the scaling for the result. For example, if B=xxx.xx x1, the result will range over ±999.99 only. Anything greater than +999.99 or less than -999.99 will show "OL" (overload).

Clearing Mx+B Scaling from a Channel

To clear Mx+B parameters from a channel, the Mx+B parameters can be programmed to 1x+0 (M=1, B=0), or the channel function can be changed to any other selection, including OFF.

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2635A specifications

The Fluke 2635A is a highly advanced multichannel data acquisition system designed for engineers and technicians requiring precision and versatility in their measurement tasks. This instrument excels in monitoring and capturing data from various sources, making it a valuable tool in laboratories, production environments, and field applications.

One of the standout features of the Fluke 2635A is its ability to support up to 20 measurement channels. Users can simultaneously monitor multiple signals, which is crucial for complex testing scenarios where numerous variables need to be tracked. The device is equipped with a 6.5-digit precision measurement capability that ensures high accuracy and resolution in readings. This level of precision is particularly beneficial in applications such as environmental monitoring, research and development, and industrial process control.

The unit incorporates a variety of measurement modes, including voltage, current, temperature, and resistance, making it exceptionally versatile. The Fluke 2635A not only handles standard signals but also integrates with various transducers, providing extensive compatibility for users engaged in diverse testing applications.

To enhance data management, the Fluke 2635A offers advanced data logging capabilities. Data can be stored internally or transferred to external devices for further analysis. The internal memory can accommodate extensive datasets, which can be crucial in long-term monitoring tasks. Integration with external software enables users to analyze and visualize data effectively, allowing for informed decision-making based on comprehensive results.

The user interface is designed for ease of use, featuring a large, bright LCD display that clearly presents measurements and status information. The device is also equipped with a simple navigation system, allowing users to switch between channels and measurement types without hassle.

In terms of construction, the Fluke 2635A is built to withstand rigorous environments. It features a robust design that ensures reliability and durability, making it suitable for both laboratory settings and field operations. Furthermore, the device supports a wide temperature range, thus enabling usage in diverse conditions.

Overall, the Fluke 2635A is a powerful and flexible instrument that provides precise measurements across multiple channels, supporting a wide range of applications. Its advanced technology, combined with user-friendly features, makes it an essential tool for professionals in various fields. The combination of accuracy, flexibility, and durability solidifies its standing as a trusted choice for data acquisition and monitoring tasks.

Fluke 2635A user manual Setting the Mx+B Scaling, Examples, Clearing Mx+B Scaling from a Channel

Models: 2635A