Design Con 2015

Battery operated unit detects PIM in remote locations

-December 19, 2012

Last year, I was given the assignment to write an article about passive intermodulation (PIM). That was when I first spoke to the team at Anritsu about their PIM test analyzer, and just recently they gave me an update. The big news is that now the analyzer is truly portable, because they significantly shrunk the size (it is one quarter of what it used to be) and it is battery operated (lasting more than 2.5hours). This makes testing for PIM in remote radio head and indoor distributed antenna systems finally possible. Rooftop sites can benefit from it too (see picture).

So, you might ask, what are the specs on this new PIM Master MW82119A.  The device tests at 40W and, of course, includes the company’s “distance to PIM” feature, which provides insight to where the PIM problem is, even if it is outside the antenna system. Power can be adjusted down to 0.3W look for PIM on lower-power systems. There are six new models, covering the upper and lower 700 MHz bands, 850 MHz, 900 MHz, 1800 MHz, 1900 MHz, and 1900/2100 MHz.

The PIM Master also includes standardized testing set ups, and you can stamp your test with GPS information (this functionality is an option). The unit has an A/C  and an automotive adapter, both recharge the battery. Another neat feature is that (with an optional USB power meter), it can be operated in power meter mode.

The unit has several operating modes, including PIM vs time measurement (new mode), swept PIM measurement (mostly for factory testing), and the aforementioned distance to PIM measurement. It also has report management capabilities, allowing you to overlay PIM plots (comparing different lines), store the results, and create one unified test report that includes PIM, VSWR, distance to fault, and distance to PIM.

As you likely know, Anritsu has many handheld units, so these PIM Master ones are designed withstand the same rugged conditions as the company’s other portable products. The team tells me that each unit is subjected to a 50hour burn in, 2 hour thermal cycles.

More information:
Delivery is 4 to 6 weeks.
Product web page

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