USB-1608G Series

We offer two versions of the USB-1608G Series products. The USB-1608G (w/enclosure and screw terminals) and the USB-1608G-OEM (no enclosure and headers). Unfortunately, there is no enclosure available for the -OEM version since the enclosure used on the USB-1608G version would not give access to the headers to allow for signal connections.

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In that FAQ, the created application installer is asked to install our InstaCal driver set. But the end-user must still manually run InstaCal (the user must launch inscal32.exe) so that the USB-1608G hardware is assigned a board number (usually board # 0). If the user cannot locate the file named inscal32.exe, then the InstaCal driver set was not installed properly by your installer.

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These warnings are because we saved/distribute our VIs in an older version of LabVIEW than you are developing in. Simply re-save the VIs, and then the next time you open your project, you will not get these warnings.

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The USB-1608G series provides no ground isolation. The analog and digital circuits each have their own ground planes. This helps with noise reduction in the circuits. However, they eventually come to a single point connection under the ADC. Measurement Computing does offer DAQ products with isolation. Please contact us at 1-800-234-4232 Ext-3 to discuss the options.

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Unfortunately, DAQ Assistant will only work with National Instrument’s LabVIEW and NI DAQ products. For help with programming your LabVIEW application using our ULx drivers for LabVIEW, please refer to our KnowledgeBase article “Getting Started with LabVIEW and ULx” here: http://kb.mccdaq.com/Search.aspx?Keywords=Getting%20started%20with%20LabVIEW.

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Burstmode is not a setting/choice that is supported by ULx. However, specific to the USB-1608G series, note that when external clock mode is used, it mimic burstmode (i.e. all enabled channels are sampled once per clock pulse). So, if you want to use the on-board (internal clock), then the workaround is to instead wire the timer output of the unit over to its external clock input, specify external clock for the AI, and then start the timer output (using ULx’s counter output VIs) at the desired sample rate.

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The trigger on the USB-1608G series accepts only TTL level, digital input (0 to 5 volt logic). The portion of the data sheet that I believe you are referring to describing the “Retrigger” feature… “In retrigger mode, you can set up repetitive analog input trigger events” is referring to the digital trigger event starting your “Analog Input Scan” so as to capture an analog event, triggered by the TRIG input. Unfortunately, you cannot connect an analog trigger signal. However, the “Retrigger” feature will work the way you have described below in that the trigger will rearm itself and wait for the next DIGITAL trigger event to occur to start another acquisition. Excerpt from the ULHELP: Retriggering Use RETRIGMODE with AInScan() to set up repetitive trigger events. Use the ConfigItem option BIADTRIGCOUNT with cbSetConfig() to set the A/D trigger count. When using RETRIGMODE, set the values for the Count argument (cbAInScan()/AInScan()) and the BIADTRIGCOUNT argument (cbSetConfig()/SetAdRetrigCount()) to an integer multiple of the number of channels in the scan. That way, the entire buffer, or the portion of the buffer defined by BIADTRIGCOUNT, will contain updated data.

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The USB-1608G is not directly compatible with 4-20 mA signals. It lacks the necessary signal conditioning. However, with the use of a low cost, precision 249 ohm resistor placed across the USB-1608G’s +-5 volt differential inputs you can easily create a current shunt which will produce a 1-5 volt drop across the shunt. With 1 volt equal to 4 mA and 5 volts equal to 20 mA.

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The USB-1608G is a multiplexed DAQ device using a single A/D converter. If you need a simultaneous DAQ device, please take a moment to review the following products: USB-1608FS-Plus, USB-1608HS, USB-1602HS, or the USB-1604HS DAQ device.

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You can test the digital output function by running the InstaCal Analog Loopback test. Close your 3rd party program before launching InstaCal – then you choose which digital output bit for it to toggle, and you wire (loopback) it to an analog input channel. You should see a square wave on the screen. The amplitude of the digital output is not adjustable. If the digital output toggles properly in InstaCal, then the issue is with your 3rd party program.

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Hello - I believe you are referring to NI’s SignalExpress. MCC’s ULX driver is not compatible with SignalExpress. ULx is compatible with the traditional LabVIEW graphical programming environment.

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Hello - The USB-1608G will not meet your accuracy requirement of 0.001 volts. The stated accuracy for the +- 10 volt input range is 4075 uV (4.075 mV) and for the +- 5 volt input range is 2266 uV (2.266 mV). To attain a 0.001 volt accuracy you would have to use one of our 24 bit DAQ devices. Like the USB-2404-10. http://www.mccdaq.com/products/product-listing.aspx?oid=1596&r=24 but please do not confuse accuracy with resolution. If you need 0.001 volts of resolution then the USB-1608G will work just fine. Your resolution for the +- 10 volt range would be 0.000305 volts/LSB. I have added a link below to a Knowledge-Base whitepaper on accuracy and resolution. Please do not hesitate to contact MCC with any additional questions. http://kb.mccdaq.com/KnowledgebaseArticle50043.aspx?Keywords=Accuracy

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No. The thermocouple generates a tiny voltage, and even with a 24 bit DAQ there is not enough voltage range on the thermocouple to measure it directly with the USB-1608G. Alternatives are to make a thermocouple pre-amplifier to boost the voltage up to a level where it can be directly read by the DAQ. Also DAQs that do measure thermocouples have internal pre-amplifiers, like the USB-2408 Series DAQ. The DAQs that do measure thermocouples also have an internal reference thermocouple.

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You should get a USB-TC or USB-TEMP for that. They are designed for reading thermocouples, and give temperature directly. Unlike the USB-1608g they compensate for the temperature-dependent voltage drop due to the mismatch between the terminal on the DAQ and the thermocouple wire.

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The USB-1608G was not designed to read thermocouples directly. It lacks 3 things needed: very high gain/amplification, cold junction compensation circuitry, and low pass filtering. Instead choose a product designed with thermocouples in mind, such as the USB-TC or USB-2408.

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Hello Emenyke, Yes, the AI-EXP32 will expand the channel count on the USB-2416 to 64 single ended or 32 differential. My recommendation for a 50 channel analog system with signal isolation would be the Daqlab/2005 with the DBK42 x 4, ISO-5B32-01 modules and a CA-37-4 cable to make the interconnections to the Daqlab/2005 unit.

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For 4-20 mA isolation, MCC recommends the ISO-5B32-01 module. You can review the specifications here: http://www.mccdaq.com/signal-conditioning/ISO-5B32-01.aspx There will be other accessories required for you to interface the ISO-5B32-01 to your USB-1608GX DAQ device. I recommend that you purchase, along with the ISO-5B32-01 modules(s), an ISO-RACK08 backplane (http://www.mccdaq.com/signal-conditioning/ISO-RACK08.aspx), a CIO-MINI37 and a C37FF-2 interface cable. This setup will allow you to make the necessary connections between the ISO-5B32-01 module and your USB-1608GX. Another option would be to purchase our USB-2404-UI which supports channel to channel and channel to ground isolation as well as (4) +- 25 mA input ranges. http://www.mccdaq.com/usb-data-acquisition/USB-2404-UI.aspx

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Hi Lglendening - Yes, It is possible to use 2 or more of our products with the Universal Library API in this manner.

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The USB-1608GX-2AO does not support pretriggering. Please contact Sales Engineering for assistance with selecting a Data Acquisition product that supports pretriggering.

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Yes, the USB-1608GX-2AO with the appropriate software will support concurrent analog input and output operations. The dimensions for the USB-1608GX-2AO are as follows: 5.0 (L) x 3.53 (W) x 1.40 (H). For future reference dimensions for our products can be located in our User’s Manuals. Please feel free to contact us if you have any additional questions.

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Hello - The USB-1608GX-2AO does not support simultaneous sampling of the analog inputs nor does it support synchronized sampling of the analog inputs and outputs. For this you will need to use our USB-1602HS-2AO or USB-1604HS-2AO DAQ devices. http://www.mccdaq.com/usb-data-acquisition/USB-1602-1604-Series.aspx Both devices support simultaneous analog inputs and synchronized sampling of the analog inputs and outputs.

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What you are describing here cannot be accomplished with using the digital input/output bits on the USB-1608GX-2AO. The digital I/O bits on the USB-1608GX-2AO are updated via software and not hardware paced with a clock. If you require a multi-function unit like the USB-1608GX-2AO that supports hardware paced digital I/O then our USB-1616HS-2 or -4 model will work. If you require just digital support then our USB-DIO32HS will do the job.

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Thank you for your inquiry. The Universal Library will support concurrent paced operation of the analog inputs and the analog outputs on the USB-1608GX-2AO device.

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