WebDAQ 504

The WebDAQ series are primarily stand-alone loggers. The data is always collected to the local storage (non-volatile memory). To receive relatively “live” data from the current job over the network, the Rest API can be used by a programmer. Up to 10000 samples can be read/requested each time. We provide Rest API examples in LabVIEW, C#, VB, and Python. If you need access to data during a sampling session, then use the Rest API, and the data it returns is in engineering units. Alternatively, you can map a Network folder or an FTP server, and the WebDAQ can automatically send its binary data files to that location in parallel to saving the data to its own memory. The data is sent at the end of the job (not live), and is binary (requiring conversion before being usable).

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Yes, real time data and alarm status can be accessed using the REST API. The FFT, however, is performed real time and cannot be transferred using the REST API. FFTs would need to be performed dynamically using the real time data collected from your WebDAQ 504. The REST API can be downloaded from https://www.mccdaq.com/downloads/WebDAQ/REST-API/1.0.0/

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The digital I/O on the WebDAQ 504 is not setup for use with a Tachometer signal. The isolated digital I/O lines can be used as triggers to start or stop the acquisition or as alarm outputs. However, we do have other vibration DAQ devices that support a tach input. Please take a minute to review our DT9837 series or our DT9857E series DAQ devices for details. https://www.mccdaq.com/pdfs/specs/DT9837-Datasheet.pdf https://www.mccdaq.com/pdfs/specs/DT9857E-Datasheet.pdf

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Referring to the hardware specs, there are only 31 possible sample rates. (fM ÷ 256)/n, where n is any integer from 1 to 31. The lowest rate is 1.652 kS/s and the fastest is 51.2 kS/s. The WebDAQ 504 hardware is not capable of sampling at any other rates. You should only request one of the 31 possible rates. Outcomes using other rates are not known and not supported. MCC strongly recommends that the WebDAQ web interface (not the REST API) be used to create or modify schedules, jobs and device settings.

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The digital trigger input is sampled by software running on the logger, and therefore it can have a variable delay. I am seeing a delay of around 30 mS. If you have a spare AI channel on the WebDAQ 504, you could bring your trigger signal in on an AI channel. Triggering off of an AI input channel (rising slope) will have a faster response. I am seeing a delay of just one A/D sample.

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The file format from our WebDAQ 504 is not compatible with Data Translation’s QuickDAQ application. The supported file formats are as follows: .csv (delimited ASCII), .uff (ASCII), .uff (Binary), .bin (Binary). For a detailed description of each file format please refer to our WebDAQ 504 Help File at: https://www.mccdaq.com/PDFs/Manuals/WebDAQ/help/en/datafiles.html?WEBDAQ504

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Start by creating a job. In the Acquisition tab of the Job Editor dialog, select "Duration" from the Stop Settings drop down and set the samples per channel to collect data for the desired duration. Once the remaining job setting are configured, click Finish. Next, click the gear icon next to "Schedule" to open the Schedule Settings dialog. In the Schedule Settings dialog, set the schedule repeat settings to the desired interval and click OK.

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Yes, the WebDAQ 504 is compatible with most IEPE transducers which include microphones. The data can be displayed in dBs but is not saved to file using the dB format, it's saved in its raw state. The WebDAQ 504 was designed with the intent that our customers would analyze the data using use a different software package for data analysis.

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Yes; remove the onboard jumper W1 to start the WebDAQ whenever the power adapter is plugged in and receiving power. If a power loss occurs, the device will restart automatically when power is restored. You may also want to configure the Schedule to start on power up so it runs when power is restored. Refer to http://kb.mccdaq.com/KnowledgebaseArticle50733.aspx for more information.

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The maximum sample rate for the WebDAQ 504 is 51,200.00 Hz. Yes, the frequency or Sample Rate is adjustable. There are 31 sample rate steps that you can use for the WebDAQ 504. To calculate your sample rate, simply take the fastest rate of 51,200.00 and divide it by one of the 31 steps. Ex: 51,200.00 Hz/31 = 1,651.6129 Hz (minimum sample rate)

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The WebDAQ series does not support synchronization through a “Master/Slave” configuration, where the timing and clock signals are shared. This type of synchronization is not supported. Current options for synchronizing multiple WebDAQs are as follows:

• Use the “Date&Time” option on each WebDAQ to start your acquisition at the same time.
• Use an “External Digital” start trigger to start your WebDAQs at the same time.
• Use an “External Analog” start trigger to start your WebDAQs at the same time.

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