September, 2021


www.us-tech.com Functional Testing of RF Boards... Continued from previous page


ventional and shielded inserts. In many cases a mating connector would


yield the best RF performance. But, the usage of mating connectors is quite often very impractical for FCT. Also for MMCX, which is a 6 GHz inter-


face, the probe performance can be occasion- ally be even better than the connector — depending on the choice of test device. Consider the following when selecting a


test probe for MMCX.


cal performance or greater RF performance? l


lDoes the project require greater mechani- What is the total budget?


lWhat is the deadline for completion? lHow much space is available


for a test fixture? l


How much space is needed


inside the fixture? l


Does the project call for special cables or connectors?


Probe Tips and Calibration When it comes to test probes


there are several types: press-fit designs with longer dielectric parts, lower frequency ranges, excellent mechanical stability,


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INGUN’s HFS-856 series flange-mounted probe.


and a small form factor, such as INGUN’s HFS-810 probe series; screw-in types, that offer better mounting features and probe retention inside receptacle, such as the INGUN HFS-8x0 series with “M” at the end of the part number; flange mount types, which often come with built-in float that allows the probe to move in the x and y axes during compression to overcome DUT tolerance issues, such as the INGUN HFS-856 series with the respective version for MMCX. A probe-tip calibration


should be considered in order to obtain correct measurement results. With such a calibration method, the electrical perform- ance is measured right at the tip of the probe (which becomes the reference plane). Several different options can


be used to calibrate the probe at this point. One of the easiest ones is to use an electronic calibration module, also known as an “e-cal module,” and connect a 3.5-mm- to-MMCX or SMA-to-MMCX adaptor. Ideally this adaptor is in the probe plate, instead of the DUT, to allow in-situ calibration. But, even if the calibration must take place outside the test


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Mating section of an MMCX connector.


fixture it would be better than not doing any calibration at all. The key point though is not


to add additional cabling or adapter after the calibration is done. That would change the reference plane


and the S-parameter results would not be accurate. A dummy DUT or custom-made cal kit which emulates the outline geometry of the DUT but instead has short, open, load, and through connections at the exact location where the MMCX would sit on the board is another more complex and application-specific method to characterize probe performance. Contact: INGUN USA, Inc., 252


Latitude Lane, Suite 105-106, Lake Wylie, SC 29710 % 803-831-1200 E-mail: sales@us.ingun.com Web: www.ingun.com r


Page 57


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