Re: [Discuss-gnuradio] USRP heating up !

[Matt Ettus]

Can you measure the current draw of the system?

matt

Quoting Javs <address@hidden>:

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> Matt,
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> I tried the following and observed this:
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> >During normal operation, the AD chips can get pretty warm.  Try >this:
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> >1 - Take off all daughterboards.
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> >2 - Plug in the the USRP.  Do not run any software.  Leave it for a >few
> minutes.
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> >  Every chip other than the power supply on there should be at room temp.
> The LED should be flashing about 2-3 times per second.
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> Power supply and the Cypress chip(?) are a little higher than room
> temperature. LED at 3Hz.
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> >3 - Run some of the examples, and quit them normally (no ctrl-C).  >A few
> minutes later the FPGA and AD chips should be back to room >temp.  The LED
> should be flashing slower.
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> FPGA is warm. AD chips get warmer and so does the cypress chip. LED at 1hz.
> And they do NOT get back to normal temp.
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> >4 - Run a receive program (like usrp_fft).  After a few minutes, >the AD
> chip should be just slightly warm.
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> Yes it is !
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> >5 - Leave the receive program running.  In another window start up >a
> transmit program (like usrp_siggen).  The codec chips should get >pretty hot,
> but not painfully hot.  The FPGA should only show the >slightest hint of
> warmness.
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> At this stage when I run simultaneous Tx (siggen) and Rx (usrp_fft) programs,
> the Codecs get pretty hot. To the extent that I cannot lay my fingure and
> rest it for about 3-5 secs (burning sensation). The FPGA is slightly warm and
> the FX2 stays somewhere between the codecs and FPGA.
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> >6 - Quit the receive program.  The chips shoul get much cooler now.
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> >7 - quit the transmit program.  Everything should return to room >temp.
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> The temperature drops down a bit, but still hot(definitely NOT at room
> temperature). I am concerned if there are any hidden processes going on in
> the codecs even after I close the programs which are causing this heat?
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> I understand that I am not using specific numbers to pinpoint the degree of
> heat, but I hope I gave the picture.
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> Thanks in advance.
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> Javs
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