USB-2408 Serie

For the USB-2408 (and USB-2416), do not use the Composite VIs. Instead, use the analog input VIs, and both your voltage and thermocouple channels will be read properly. Here is a link to an FAQ with an example VI: http://kb.mccdaq.com/KnowledgebaseArticle50396.aspx

War diese Antwort hilfreich? Ja (0) / Nein (0)

InstaCal does play a role in configuring the analog channels of the USB-2408, but not in configuring its digital channels. Also close InstaCal all the way before launching LabVIEW (do not have both applications open). Below is a knowledgebase article that includes a downloadable example VI that uses the digital channels for both input and output in LabVIEW: http://kb.mccdaq.com/KnowledgebaseArticle50354.aspx

War diese Antwort hilfreich? Ja (0) / Nein (0)

Hello, Interrupt on Change is not supported by the USB-2408. Please contact Sales Engineering at 1-800-234-4232 Ext-3 for assistance with selecting a product that supports Interrupt on Change.

War diese Antwort hilfreich? Ja (0) / Nein (0)

Figure 7 in the USB-2408’s hardware manual (PDF) shows the typical differential thermocouple connections. Differential is required for thermocouples, to best reject noise common to both wires of a thermocouple. Attempting to read a thermocouple in single ended mode will have too much noise to be useful. Also be sure to set the datarate (not the sample rate) to either 50 Hz or 60 Hz, depending upon your local power grid’s frequency, to help reject that particular noise. Our ULx driver (through our underlying UL driver) for LabVIEW handles the cold junction compensation and linearization for you. This is rather complex and there is rarely a benefit of attempting to performing them yourself (also our ULx driver does not give you a way to read the CJC sensor alone).

War diese Antwort hilfreich? Ja (0) / Nein (0)

The USB-2408 Series hardware does support using a mix of Single-Ended (SE) & Differential (DIFF) Inputs, together in the same acquisition. You must designate each channel pair as either SE or DIFF, usually done in InstaCal, or done in DAQami if that is the software package being used. Take care to note which channel numbers to have your software sample from (as the numbering is different between SE and DIFF).

War diese Antwort hilfreich? Ja (1) / Nein (0)

The USB-2408 is supported by two of our “Out of the Box” applications, DAQami and TracerDAQ. Either application will allow you to acquire and generate data. DAQami and TracerDAQ also support data logging to a file and allow for file conversion to a CSV format, for use within Excel.

War diese Antwort hilfreich? Ja (1) / Nein (0)

There is no user-accessible offset adjustment on MCC’s thermocouple measurement devices. No offset adjustment should be required to meet specified accuracy for USB-2408 units that have been in service for < 1 year (since factory calibration). If you feel that the temperatures are offset on the order of 1 or 2 deg C, then try preventing excessive airflow over the USB-2408’s screw terminals. An error of 10’s of degrees indicates an incorrect setting for your type thermocouple wire. If the offset error is << 1 deg C, then it is most likely within the overall accuracy spec of the USB-2408, or it could be error in the thermocouple itself or in the standard that you are comparing the USB-2408 to.

War diese Antwort hilfreich? Ja (0) / Nein (0)

The lowest input range supported on the USB-2408 and USB-2416 is +- 0.078125V. You can select any of the supported inputs ranges when in single ended or differential mode. Open circuit detection is only supported when in thermocouple mode.

War diese Antwort hilfreich? Ja (0) / Nein (0)

Hello VH - Be sure to not have InstaCal and DASYLab open at the same time. The result may be that channel settings made in InstaCal are not picked up by DASYLab. Drag the Analog Input module, from the MCC-DRV module list, to the worksheet. Double click on it, and note that this module defaults to one channel. Double click on additional channels at the top (to turn a blue channel icon to orange). The result, after you close the window, will be additional channel terminals appearing on the right side of the module icon.

War diese Antwort hilfreich? Ja (1) / Nein (0)

Hello JP – the Upgrade price to go from DASYLab Version 10 to Version 13 would depend on which version of DASYLab you currently own (Lite, Basic Full, Pro) Please give us a call to discuss this upgrade. Yes, we will give you the $49 credit that you spent on DAQami towards a DASYLab upgrade.

War diese Antwort hilfreich? Ja (0) / Nein (0)

Hello JP, Yes, you can use 2 or more USB-2408s on a single PC to increase your channel count. Each USB-2408 will require its own USB port. Below are the software packages that will support multiple USB devices: TracerDAQ PRO, Universal Library for Windows, UL for Android, ULx for NI LabVIEW, and DASYLab. Based on our discussion yesterday, you have DASYLab BASIC v10. My recommendation would be to upgrade your current license to v13. Your other options would be to upgrade to TracerDAQ PRO or use one of the supplied programming libraries and develop your own custom program. At this time DAQami only supports 1 USB device so if your desire is to use DAQami then you will need to purchase the USB-2416.

War diese Antwort hilfreich? Ja (1) / Nein (0)

Yes, the $599.00 price for the USB-2408 includes our MCC DAQ CD which includes InstaCal, TracerDAQ (virtual Instrument suite), the Universal Library for Microsoft .NET, the UL for Android , and our ULx drivers for NI LabVIEW. Yes, with the use of a shunt resistor you can measure current using the USB-2408. For example if we were to assume that you have a 4-20mA input signal you could use a 250 ohm shunt resistor which would create a voltage drop of 1-5 volts with 1 volt equal to 0.004A and 5 volts equal to 0.020A. To calculate your resistance value simply use Ohms law (I = E/R).

War diese Antwort hilfreich? Ja (0) / Nein (0)

Hello Serchu, Yes, our DAQ devices are compatible with DC based LVDT sensors. Our expertise here at MCC is with our DAQ hardware but the LVDT sensors that I am familiar with generally require a 10 -30 VDC excitation source and output a +- 5 volt or a 4-20 mA signal based on its displacement.

War diese Antwort hilfreich? Ja (0) / Nein (0)

The legacy UL for LabVIEW did not support 24 bit A/D data, and thus it cannot be used for voltage measurements on the USB-2408. Temperature measurements do work, so thermocouples could be used. If you can’t update to a newer LabVIEW version, you could make analog measurements by directly calling the cbVIn function in our DLL. Contact our Technical Support folks for more info if needed.

War diese Antwort hilfreich? Ja (0) / Nein (0)

Hello Eric, There are two likely issues you may be seeing. First there is a known issue, listed in the ULx help file that is specific only to LabVIEW 2009. Secondly, independent of the LabVIEW version: For the USB-2408 and USB-2416, all channels are considered to be “voltage” channels, not temperature channels, even if some of your channels are measuring thermocouples. There is an FAQ on this topic here: http://kb.mccdaq.com/KnowledgebaseArticle50481.aspx

War diese Antwort hilfreich? Ja (0) / Nein (0)

Measurement Computing recently released Android (tablet/smartphone) support for several USB products. Unfortunately, the USB-2408 is currently not one of them. You can view all of the Android supported hardware here: http://www.mccdaq.com/daq-software/universal-library-android.aspx

War diese Antwort hilfreich? Ja (0) / Nein (0)

With LabVIEW closed all the way, configure one or more channels in InstaCal for thermocouple type N, and also set the datarate to 60 Hz (for best noise rejection). Then close InstaCal and launch LabVIEW. Now when you make a voltage measurement on those channels, the data will automatically be returned in Degrees Celsius. i.e. you do not need to know the CJC value, since our driver will perform all the calculations for you.

War diese Antwort hilfreich? Ja (2) / Nein (0)

Hello Paolo - please see the below KB article for more information on this topic: http://kb.mccdaq.com/KnowledgebaseArticle50584.aspx

War diese Antwort hilfreich? Ja (0) / Nein (0)

Thank you for your inquiry. I reviewed your question and the USB-2408-2AO will support your application requirements. One thing to note is that the USB-2408 series supports an aggregate sample rate of 1000Hz. So if you need to sample your inputs at a faster rate you will require a different product. The -2AO version also supports 2 analog outputs. However, I do not see a requirement for analog outputs therefore, if you need a faster 24 bit DAQ device our USB-2404-10 would be a good choice. As for software I would recommend that you use our DASYLab graphical programming language. Please feel free to give us a call if you would like to discuss this further.

War diese Antwort hilfreich? Ja (0) / Nein (1)