[Elecraft] K3 SN 3757 resistance checks fail ?
Hi K3 friends. I am Ramiro, EA1ABZ. I have almost finished K3 assembly and I have reached resistance checks in page 45 of the assembly manual. The measured resistance in U 12 is 445 omhs, and the manual states that this resistance should be greater than 500 ohms (although in some K3 it may be only slightly greater than 500 ohms). Mi measurement is below 500 ohms. Do you think that I should search for a fault.? U13 resistance is 420 ohms, greater than 150 ohms, as manual says. Thank you very much. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 SN 3757 resistance checks fail ?
2009/12/26 Ramiro Aceves ea1...@gmail.com: Hi K3 friends. I am Ramiro, EA1ABZ. I have almost finished K3 assembly and I have reached resistance checks in page 45 of the assembly manual. The measured resistance in U 12 is 445 omhs, and the manual states that this resistance should be greater than 500 ohms (although in some K3 it may be only slightly greater than 500 ohms). Mi measurement is below 500 ohms. Do you think that I should search for a fault.? U13 resistance is 420 ohms, greater than 150 ohms, as manual says. Thank you very much. I have made resistance checks at U12 with another multimeter (cheaper one, the first one was a FLUKE 175 ) and I get more than 2 kohms, forward and reverse polarity. I have made some investigation: The fluke uses 7 V to make resistance measuremens, and the cheaper one uses 0.6 V, so that could explain the diference. What do you think?, Do you think that I sould worry about the resistance checks or continue doing the Initial Power On Check? Thanks Ramiro. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3 SN 3757 resistance checks fail ?
Ramiro, Yes, the higher voltage can cause solid state active devices to conduct and give you false resistance readings. 73, Don W3FPR Ramiro Aceves wrote: 2009/12/26 Ramiro Aceves ea1...@gmail.com: Hi K3 friends. I am Ramiro, EA1ABZ. I have almost finished K3 assembly and I have reached resistance checks in page 45 of the assembly manual. The measured resistance in U 12 is 445 omhs, and the manual states that this resistance should be greater than 500 ohms (although in some K3 it may be only slightly greater than 500 ohms). Mi measurement is below 500 ohms. Do you think that I should search for a fault.? U13 resistance is 420 ohms, greater than 150 ohms, as manual says. Thank you very much. I have made resistance checks at U12 with another multimeter (cheaper one, the first one was a FLUKE 175 ) and I get more than 2 kohms, forward and reverse polarity. I have made some investigation: The fluke uses 7 V to make resistance measuremens, and the cheaper one uses 0.6 V, so that could explain the diference. What do you think?, Do you think that I sould worry about the resistance checks or continue doing the Initial Power On Check? Thanks Ramiro. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.722 / Virus Database: 270.14.120/2587 - Release Date: 12/26/09 03:27:00 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
