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RSS FeedsData Acquisition > Starter Kits In Frequency Measurements Part 1, I described why you might need to include frequency as part of a complete data acquisition or data logger measurement. In this part I’ll explain how a data acquisition or logger system typically makes a frequency measurement and point out the pitfalls of each approach. Read More
Category Archives: Data Acquisition
Frequency Measurements, Part 1 of 3
Data Acquisition > Starter Kits Since our newest data acquisition starter kit (DI-149) supports a frequency measurement function I thought I’d burn a few posts to talk about that feature in general terms. In this first part I’ll talk about where frequency measurements are typically encountered with examples of the specific information that can be Read More
First Impressions of the DI-149 Data Acquisition Starter-Kit
Data Acquisition > Starter Kits > DI-149 At first glance, the DI-149 looks very similar to the DI-145, DATAQ’s entry-level starter kit, released earlier this year. A closer look reveals much more. The DI-149 includes eight, fixed-differential analog inputs, four digital outputs a rate channel and a counter channel. Much more robust than its predecessor, Read More
Strain Gage Module Functionality Testing
Data Acquisition > Mixed Measurements > DI-718B Strain gage modules are used in data acquisition products to provide a supply (excitation) voltage to strain gage-based transducers and to amplify the output, which is then passed on to a data acquisition instrument such as the DATAQ Instruments DI-718B. Often, when a test engineer or maintenance technician Read More
Ambient Temp Affects Thermocouple Measurement Accuracy
Data Logger > Thermocouple We had an interesting situation develop recently for a data logger that we resell. If you follow the link you’ll see that this is an inexpensive, thermocouple (TC) data logger that’s actually quite popular. This particular application needed to monitor the temperature of biological samples shipped via FedEx over a four-hour Read More
Capturing the Quake of August 23rd, 2011
Data Acquisition > Software > WinDaq On August 23rd, 2011 an earthquake centered in the state of Virginia, at a depth of 3.7 miles, shook much of the Atlantic seaboard, New England and the Midwest. Felt as far West as Detroit, Michigan, the magnitude 5.4 quake registered atop the JW Marriott Hotel in Indianapolis, Indiana. Read More
Extracting Volume from Flow Using Counters
Data Acquisition > Starter Kits > DI-149 Counters are used in a wide variety of data acquisition applications, from measuring radiation exposure to counting the number parts coming off of an assembly line. A particularly useful counter function is extracting volume from flow. This information is critical in a host of industries. In the aerospace Read More
Single-ended vs. Differential: Confusion Reigns
Data Acquisition > Products There is a persistent quandary out there concerning the difference between single-ended and differential analog input configurations. Specifically, many have the impression that analog inputs configured to be single-ended cannot measure negative-going voltages inputs. I’m not sure where or how this rumor got started, but it’s pervasive and has led many Read More
Be Mindful of Polarity When Making Thermocouple Measurements
Data Acquisition > Thermocouple A little vigilance will save you a lot of time and aggravation when making thermocouple measurements. A common mistakes people make when using thermocouples to acquire temperature data is to assume that the red wire is positive. I know what you’re thinking, “Isn’t it?” Nope. Contrary to popular belief (and what Read More
What’s All This Sink and Source Current Stuff?
Data Acquisition > Current Anyone who has connected to the digital outputs of data acquisition or data logger systems (for example the digital outputs of our DI-2108 and Starter Kits) has wrestled with sink and source current specs, and they continue to be a topic of confusion for many. When does sink current matter, and Read More