High-Speed Recording of Frequency Trigger Points
At CAS DataLoggers we occasionally have customers in the power generation industry whose application involves a quickly-fluctuating waveform. These technicians need to accurately determine the frequency of a given waveform at each of its cycles. This can occur when manufacturers and servicers need to ensure the stability and reliability of their generators. For these applications, we offer real-time ADwin-Light Data Acquisition Systems for accurate frequency monitoring and analysis.
Identifying Fluctuating Waveform Frequencies:
In our most recent example, our customer is working in a power generation application and is investigating a rapidly-fluctuating waveform. This user wants to know its cause, so he needs a way to measure frequency easily. Here our given waveform takes the form of a sinewave, with peaks and valleys like those seen using an oscilloscope or when analyzing the AC power from a wall outlet.
Here our user is concerned with locating the waveform’s Trigger points, which mark the time between two given points in a waveform; for example two points immediately preceding each peak. In our application,
• Period is denoted as p
• Frequency is denoted as f
• The formula we use to find a given frequency is f = 1/p.
In this case, working with a power line’s frequency at 60Hz AC, the period of interest is equal to 16.667 milliseconds. This requires a high-speed system to record.
Capturing Trigger-Point Data:
Our customer is using the ADwin-Light-16 Real-Time DAQ and Control System for flexible signal generation. Consulting for this application, we first define a reference point called the trigger level. Our custom program does this by sampling the waveform very quickly (in this instance at 10 kZ).
The program commands the ADwin datalogger to start a clock, to identify the waveform’s trigger level, and then to sample data until it records the trigger point for a second time. In this way, the user then knows--at a high degree of accuracy--the time between those two points (the peak to peak). This also enables ADwin to calculate the frequency (f) of 1/p (here the trigger level).
ADwin acquires and evaluates input signals to monitor limit values. Users can also set up complex controls by using the ADwin’s capability of synchronously outputting multiple analog and digital signals on a time- or event-triggered base. The ADwin’s processor clock can capture data at extremely small increments as small as 25 nanoseconds. Depending on how fast we sample, we know the time length between the pair of events with extreme accuracy.
Frequency Monitoring Program:
Using the ADbasic programming environment, we developed a short program of just 40 lines which performs this frequency data acquisition. The program instructs the ADwin Light-16 to record the time duration between our two trigger levels. The program below took about 45 minutes to write:
DIM VAL,LAST_VAL AS LONG
DIM NEW_TIME, OLD_TIME, TIME_DIFF AS LONG
DIM TIME_DIFF_SUM, TIME_DIFF_AVG AS LONG
DIM WAIT_TIME AS LONG
DIM NUM_AVG_POINTS, AVG_COUNT AS LONG
DIM FREQ AS FLOAT
DIM TRIG_LEVEL AS LONG
DIM MIN, MAX AS LONG
'Intialize values for sampling
GLOBALDELAY=4000 '10 kHz sample rate
TRIG_LEVEL = 35000 ' voltage (in A/D counts) for marking start/end of cycle
NUM_AVG_POINTS = 5 ' number of cycles to average
WAIT_TIME = 400000 ' Wait for 1/2 cycle(10 msec.)to prevent false trigger
'Intialize variable for averaging
TIME_DIFF_SUM = 0
AVG_COUNT = 0
VAL = ADC(1)
IF (VAL > TRIG_LEVEL) THEN
NEW_TIME = READ_TIMER()
TIME_DIFF = NEW_TIME - OLD_TIME
IF (TIME_DIFF > WAIT_TIME) THEN
PAR_1 = TIME_DIFF
OLD_TIME = NEW_TIME
TIME_DIFF_SUM = TIME_DIFF_SUM + TIME_DIFF
IF (AVG_COUNT > NUM_AVG_POINTS)THEN
TIME_DIFF_AVG = TIME_DIFF_SUM / NUM_AVG_POINTS
TIME_DIFF_SUM = 0
AVG_COUNT = 1
FREQ = 1 / (TIME_DIFF_AVG * 25.0e-9)
FPAR_1 = FREQ
Many data acquisition systems on the market can sample frequencies, but ADwin hardware is capable of the high speed needed to capture all this frequency data in one cycle. Other data acquisition systems typically have to sample data over 5-10 cycles, having slow averages and too long a window to capture much data. Meanwhile ADwin’s processor clock and resolution can acquire frequency data at speeds of 25 nanoseconds, all during a single cycle for effective frequency analysis.
Additionally, ADlog software can log the values if required. ADwin has many post-measurement capabilities to work with the data—for example, users can view statistics such as standard deviation and Avg/Min/Max.
To learn more about ADwin Real-Time DAQ Systems, or to find the ideal solution for your application-specific needs, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit our website at www.DataLoggerInc.com.
Computer Aided Solutions, LLC. dba CAS Data Loggers is a distributor of data loggers, paperless recorders and data acquisition equipment.
CAS DataLoggers, Inc.
8437 Mayfield Rd.
Chesterland, Ohio 44026
This release was published on openPR.
Permanent link to this press release:
Please set a link in the press area of your homepage to this press release on openPR. openPR disclaims liability for any content contained in this release.
You can edit or delete your press release High-Speed Recording of Frequency Trigger Points here
News-ID: 364690 • Views: 398
More Releases from CAS DataLoggers
New Delphin LoggitoLab Compact Data Acquisition System
Delphin Extends Popular Loggito Family for Laboratory Applications CAS is pleased to announce that Delphin Technology has added a new version of the popular Loggito data logger/data acquisition systems targeted at laboratory and portable applications. The new LoggitoLab offers plug-and-play connectors for thermocouples and/or banana plugs to simplify the sensor connections. The LoggitoLab is ideal for research and development, educational, or industrial application where sensors must be repeatedly connected and disconnected.
New ProfiSignal 20 Software Package From Delphin
CAS is pleased to announce the new ProfiSignal 20 (PS20) software package from Delphin Technology. This software provides platform independence by allowing data collected with Delphin data acquisition systems to be visualized and analyzed on a PC, tablet, or smartphone. ProfiSignal 20 is available in several versions depending on the application requirements. The “Go” version can be used for quick visualization, monitoring, and archiving of measurement data. It includes configurable single
CAS Reaches Over 600 COVID-19 Vaccine Monitoring Kits Shipped!
Since the rollout of COVID-19 Pfizer and Moderna vaccines at the end of December 2020, CAS has been hard at work meeting the demand for vaccine temperature monitoring kits. This demand has only increased with the addition of the Janssen/Johnson & Johnson vaccine and the expansion of vaccines available to the general public in the United States. As of Monday, March 15th, 2021, CAS has now shipped over 600 COVID-19
New Wireless IoT ProfiSens Series from Infinite Informatics
New ProfiSens Wireless IoT Series from Infinite Informatics CAS DataLoggers is pleased to introduce the new AERINOS ProfiSens wireless IoT series from Infinite Informatics. The series includes a family of wireless sensor nodes and a cellular Data Gateway which forwards data and sends SMS alarm messages. Using ProfiSens, you can deploy anywhere using your own IoT network. The ProfiSens series includes the following components: ADU-700: Low power data concentrator with a cellular modem ADS-101:
More Releases for ADwin
Scanning Electron Microscope Loop Control Using ADwin
ADwin-Gold-II DAQ System Offers High-Speed Control scanning electron microscope application photoCAS DataLoggers supplied the control solution for a university physics department conducting research using a scanning electron microscope (SEM). SEMs generate extremely high-resolution (on the nanometer level) images by focusing a narrow electron beam to scan the sample. Part of the beam is absorbed by the material being scanned, but about 10-20% of the electrons are reflected off the surface. These
Cold Atom Physics Experiments Controlled by ADwin
ADwin-Pro-II Real Time Data Acquisition & Control CAS DataLoggers provided the data acquisition and control solution for a professor of physics, specifically focusing on cold atom physics at a major university. They began running an experiment producing ultracold quantum gases containing either bosons and fermions. The experiment took place under high vacuum inside a pyrex glass cell. Researchers collected the atoms in a magneto-optical trap (MOT) which consisted of 6 laser
ADwin for Plastic Injection Molding Process Monitoring
Control Shot Injection with an ADwin Gold System Recently CAS DataLoggers interviewed a long-time customer using an ADwin-Gold Real-Time Data Acquisition & Control System. Read on to learn how his plastic injection molding business has benefitted from high-speed data acquisition—and how your business can do the same. Q&A Session Q: You have been using the ADwin Gold system for plastic injection molding process monitoring of your equipment for several years now, how do
ADwin for Test & Control of Rotating Machines
Real-Time Data Acquisition Systems for Machine Test Stands Automotive test bench applications require real-time test and measurement to increase PQ and to lower recall rates. To achieve this, the use of data acquisition and control systems is especially common in test stand setups. In particular, product quality technicians and test system integrators who need to view accurate data from rotating/spinning parts in motors, car engines, etc. are often concerned with the
Intelligent Data Logging Using an ADwin
Data Logging with Real-Time Pre-Processing of Data ADwin Real-Time systems are ideal for intelligent data acquisition and control applications. Utilizing the programmability of the local CPU in the ADwin, users can run real-time datalogging and/or control programs with kHz execution speeds up to the MHz range. CAS DataLoggers offers these systems along with technical support-- contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit our website at www.DataLoggerInc.com. ADwin’s
Jager-ADwin Releases New Software Update
Ver. 6.00.08.01 Adds Support for MATLAB, LabVIEW CHESTERLAND, OH—June 20, 2016 Jager-ADwin has just released a new version of the ADwin CD-ROM. Version 6.00.08.01 adds more support for MATLAB and LabVIEW, improved cache management, and several minor bugfixes. ADwin data acquisition and control systems are ideal for applications in automotive test, laboratory data acquisition, product R&D and more. The new ADwin CD-ROM is ready for download at CAS DataLoggers on our ADwin