Hi I'd fashion a simple loop on the end of a coax and use it to "sniff" the RF in the vicinity of the cell. You are after a relative measure, so simply knowing if it drops with time or not should tell you which way to go in the troubleshooting. Normally a spectrum analyzer is a good device to monitor the loop with, there are other ways to do it as well.
Bob On Mar 17, 2013, at 4:50 PM, Dr. Götz Romahn <[email protected]> wrote: > thank you for fast responses. As I wrote in my posting, heating seems to be > ok as reported by the PRS10 diagnostic tools. I agree with Bob and Paul: RF > seems to degrade with warming up, but how can I test this. Remember, lamp and > oscillator of PRS10 are not!!! accessible during operation and what part of > hte oscillator could be the culprit ( and why do you think it is) ? > Goetz > > Am 17.03.2013 20:59, : >> My 2 cents and it is that. The FRS use a higher voltage say 24 V and on >> ignition that drops back. I have also seen on time-nuts older systems that >> actually use an ignition voltage to trigger the lamp. >> But I agree that it sounds like the RF might be low. The bulb does need to >> be heated to get to the right color temperature also. >> >> On Sun, Mar 17, 2013 at 9:03 AM, Bob Camp <[email protected]> wrote: >> >>> Hi >>> >>> Unless the PRS10 is very unusual in it's operation there are two things to >>> check early in the debug process: >>> >>> 1) Is the oven heating up to roughly the right temperature? >>> >>> 2) The lamp is lit by RF energy. If the oscillator / amplifier supplying >>> the RF isn't putting out as much as it should (or what it should) the lamp >>> will not stay lit. >>> >>> I'd bet on number 2 in your case. There are many other possibilities, but >>> I'd check those two first. >>> >>> Bob >>> >>> On Mar 17, 2013, at 5:22 AM, Dr. Götz Romahn <[email protected]> wrote: >>> >>>> dear all, >>>> beeing a silent reader of this list for a while, I now ask my first >>> question. >>>> I have obtained a PRS10 that was declared faulty and it is. The problem >>> I located in lamp assy. >>>> Lamp ignites only after warming up and pushing by a voltage kick from >>> abt. 24V to abt 28V on the -24_heat line for some seconds. PRS10 gets >>> locked there after and rbmon shows a seemingly healthy unit (see >>> attachment). But... within some 15 to 45 minutes later light from lamp >>> degrades as seen through "LAMP VIEW" hole in top board as well as AD9 >>> Photocell I/V going down from 1.68 after ignition to 0.158 and lock is lost >>> of course. Since all heating and voltage diagnostics do stay within >>> accepted limits I suspect some problem within lamp enclosure (see >>> attachment). Your help for further diagnosis and any hints for obtaining >>> spare parts would be appreciated very much. >>>> Cheers Goetz >>>> <PRS10 after >>> ignition.jpg><lamp-assy.jpg>_______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
