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Fixed my HP 5345A today!!
Every few months I like to fire up the seldom used HP gear on the workbench.? I really love listening to the Pratt and Whitney jet engines used to cool my HP 8345A.? Being elderly and getting deafer the thrill is diminishing, however.... so I fire the beast up and let her cook for a few minutes... hook it to my 8660D just to do some quite checks.? The ranges all work, except the 100uS gate is showing a horrible .8.8.8.8.8. display. Ackkk!? Run down cellar and I am relieved to find that I did save a 5345A donor carcass.? Four hours later after swapping the front panel, and the boards, the problem is not cleared.? Pouring through the ponderous set of HP 5345A manuals provides little relief...? after some thought I come to realize the counter is fine.? The idiot owner forgot that the default power up for the 8660D is 1 MHz.? Hook her up to my never used or needed 8665A and it works perfectly.? The older I get the more I scare myself.? Any other seniors having special moments??? Peter
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Re: low amplitude readings below 10MHz on a 8591E
¿ªÔÆÌåÓýHi ?in your case ?from 238-247 if you haven¡¯t done it already? ..201 onwards? ?backing up correction constants ? One thing to check is the level of your LO feedthrough amplitude ?..the signal at 0hz on the left hand edge of the display Do frequency 0hz? span 1mhz¡ and see what the level of the LO is? --good ones are around -10db or better. ? By the way you¡¯re 8591? is a bit different on the front end than the 8590e series , yours is more prone to mixer failure but can be fixed . Lots of info on you tube ? Regards Mike g4wam ? ? ? ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen ?
Any recommendations about what paragraph? ? Gr Kees ? ? Op za 18 mrt 2023 om 18:19 schreef Mike Lockley via <mikelockley=[email protected]>:
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Re: low amplitude readings below 10MHz on a 8591E
got it and will start reading.? Any recommendations about what paragraph? Gr Kees Op za 18 mrt 2023 om 18:19 schreef Mike Lockley via <mikelockley=[email protected]>:
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Re: low amplitude readings below 10MHz on a 8591E
¿ªÔÆÌåÓýYou need 08590-90316? from? 2001 8590 series Service Guide ? Are large tome but worth downloading or buying ¸é±ð²µ²¹°ù»å¡¯²õ Mike g4wam ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen ? Hi, Are we talking about the user manual 08590-90301, because there is not much cal data in it other than the normal stuff. I also have the installation, verification & Operation manual. Or are there other manual I need? ? Gr. Kees |
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Re: low amplitude readings below 10MHz on a 8591E
¿ªÔÆÌåÓýThis is now leaning towards a YTO failure¡ªnot good. Definitely do the CAL tests as per the user guide though ? Mike ? ? From: [email protected] [mailto:[email protected]] On Behalf Of KeesHofwegen ? Hi, for laughs and giggles?I just did a new cal and now I got a GAIN FAIL op the AMPTD. ? Gr Kees ? ? Op za 18 mrt 2023 om 11:11 schreef Mike Lockley via <mikelockley=[email protected]>:
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Re: low amplitude readings below 10MHz on a 8591E
Hi, for laughs and giggles?I just did a new cal and now I got a GAIN FAIL op the AMPTD. Gr Kees Op za 18 mrt 2023 om 11:11 schreef Mike Lockley via <mikelockley=[email protected]>:
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Re: low amplitude readings below 10MHz on a 8591E
Just a thought - started with my 8591E losing low end cal signal response with remaining good readings on the high end.? It was the result of a dying YIG.? Started out initially slowly but gradually signals started losing amplitude up the frequency range.? Eventually the cal signals went quiet with just noise.? Was a real head banger until the YIG died.
-- WA4WHL |
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Re: Looking for a feedthrough capacitor
I posted my inquirey on the Wavetek side as well, with some more pics:
/g/Wavetek-test-equipment/topic/97629517#69 Its more on-topic there (Wavetek bought W&G), but a lot less folks around. On the W&G group even less, unfortunately. cheers Martin |
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Re: low amplitude readings below 10MHz on a 8591E
¿ªÔÆÌåÓýHi there, The key to this is that the problem is below 10mhz. The first calibration point is at 12mhz. From what I remember the FM coil in the YTO? does the below 10mhz steps. The main coil in the YTO must be ok as the CAL ?passes. Go into the cal menu and find SERVICE ?CAL and do the tests as shown the user manual Let us know what you find ? Regards ? Mike g4wam ? ? |
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Re: HP 312A wave analyser
On 2023-03-18, at 09:00, ChrisBeee via groups.io <chrisbeee@...> wrote:
Right. The problem is that there are no photocells in today¡¯s equipment, so even googling for ¡°photocell¡± gives you results for ¡°photoresistor¡± (= LDR, Light-dependent resistor) [1]. Common LDRs use CdS (Cadmium Sulfide) as a material, so when you read ¡°CDS photocell¡±, what is meant is a CdS LDR. Wikipedia completely avoids the term ¡°Photocell¡± in its articles about photodetectors [2], but redirects from ¡°Photocell¡± to that. As a more precise term, they use ¡°Phototube¡± [3]. (See why I sometimes like when people use the right terminology in the first place?) Gr¨¹?e, Carsten [1]: ,A%20photocell%20or%20photoresistor%20is%20a%20sensor%20that%20changes%20its,light%20will%20cause%20higher%20resistance. [2]: [3]: |
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Re: HP 312A wave analyser
Brad,
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that rather sounds like an LDR than a photocell to me. You can find them very cheap on eB in different types and sizes. Just give it a try and let us know... Chris On Fri, Mar 17, 2023 at 02:31 AM, Brad Latta wrote:
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Re: 8566B attenuator fix
I think that is most likely true. I haven't seen your circuit, but the one I'm familiar with wuse 24v to switch the couls, but uses 5v for control. If that is the same in your case, that is the probable cause. Not sure, but that is a reasonable guess.
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Cheers ?? Bruce Quoting bagojfalvibagoj@...: I'm starting to have a pretty good understanding of how the electronics supposed to work, at least most of it, but unfortunately I believe all 4 of the logic chips on mine are dead. |
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E4407B Step Attenuator
I am just about done resurrecting a E4407B that I just acquired. The last issue is the RF step attenuator. Stepping from 0dB to 25dB in 5 dB steps works fine. All steps above 25dB fail. I suspect that this attenuator has 4 pads:
5dB,10dB,20dB and 30dB I suspect that the 30dB pad is bad. Does anyone have 30dB pads for these or have an attenuator where the 30dB pad is good? This is a DC-26.5GHz attenuator. Thanks! Sam W3OHM |
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Re: 8566B attenuator fix
I'm starting to have a pretty good understanding of how the electronics supposed to work, at least most of it, but unfortunately I believe all 4 of the logic chips on mine are dead.
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low amplitude readings below 10MHz on a 8591E
Hi All,
I came into the possession of a 8591E and after calibration, I found out that when I connect my marconi 2019A to the SP and set it to 1Mhz and 0dBm the peak is hardly to see amongst the noise, while around 20Mhz it about 24dBm below the reference level and 50Mhz it is as it should be.? Does anybody know what is happening here and what to do about it? Gr. Kees |
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Re: E4407B option AYX Fast Sweep Time Domain
¿ªÔÆÌåÓýMark, ? This would mean that my AYX card probably has a problem. I'll look into it further. Thank You. ? Yves De?: [email protected] <[email protected]> De la part de Mark Bielman ? Hi Yves, ? I'd have to move a bunch of stuff around to do this properly so I rigged up something with my HP8350 sweeper (set to CW) and a 10kHz signal applied to the EXT FM input... ? I can see "something" at 20us sweep time. Not a full sinusoid but just a piece of it. But there is a trace there. (the sinusoid is visible at 4ms) ? Mark ? From: [email protected] <[email protected]> on behalf of Yves Tardif <yves_tardif@...>
Sent: Friday, March 17, 2023 12:53 PM To: [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] E4407B option AYX Fast Sweep Time Domain ? Hi Mark, ? I used a 10 kHz to 182 MHz FM signal here. I put myself in zero span, and the sweep time at 4msec. You can see the modulating signal, because I shifted the frequency of the E4407B to do slope demodulation (I don't have the demod FM option). So, we see a sinusoidal signal. At 4msec of sweep time, the signal is visible, but from 3msec to 20 usec nothing is seen. The range of 3ms to 20usec of sweep time is the range that the AYX option normally gives for 401 points. ? I guess you have different behavior with your AYX option. ? Yves De?: [email protected] <[email protected]> De la part de Mark Bielman ? Yves, ? My unit has this option, apparently no license required. I can set the sweep time to 20us but I am not sure what test you are doing. ? Are you saying that 20us sweep time is NOT displayed on the SA screen? ? Mark ? From: [email protected] <[email protected]> on behalf of Yves Tardif <yves_tardif@...> ? Hi, ? I was lucky enough to find an E4407B, it was defective but I managed to repair it. Currently, I'm doing performance tests to see if everything is working properly. I am at the stage where I have to test the sweep time. This Spectrum has the AYX Fast sweep time domain option. It is written in the Specifications Guide: ? Basic configuration sweep time for span = 0 Hz => (sweep points-1)/100kHz to 4000 sec or 10us to 4000sec for 2 points, and 4msec to 4000sec for 401 points. ? option AYX Fast Time Domain sweep time for span = 0 Hz => (sweep points-1)/20MHz to 4000 sec or 50ns to 4000sec for 2 points, and 20usec to 4000sec for 401 points. ? The AYX card is detected, and it appears in the HARDWARE or SYSTEM menu. Moreover, when I do the sweep time test, the signals appear on the BNC connectors at the back of the unit and are normal, so this card seems to work properly, but the sweep time is functional with a trace displayed on the screen, up to 4msec for 401 point, as if the AYX option was not installed. However, if I remove the card, for 401 points, the sweep time refuses to go lower than 4ms, with the card, the same test shows a minimum sweep time is 20usec as written in the technical document about this AYX option. ? In the installation manual, it seems that just inserting the card, activates this function, there is nothing else to do...there is really little detail. The card is in slot #3, I tried in slot #4 for the same behavior. ? Anyone have an idea, is the card defective? ? -Yves |
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Re: E4407B option AYX Fast Sweep Time Domain
¿ªÔÆÌåÓý
Hi Yves,
I'd have to move a bunch of stuff around to do this properly so I rigged up something with my HP8350 sweeper (set to CW)
and a 10kHz signal applied to the EXT FM input...
I can see "something" at 20us sweep time. Not a full sinusoid but just a piece of it. But there is a trace there.
(the sinusoid is visible at 4ms)
Mark
From: [email protected] <[email protected]> on behalf of Yves Tardif <yves_tardif@...>
Sent: Friday, March 17, 2023 12:53 PM To: [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] E4407B option AYX Fast Sweep Time Domain ?
Hi Mark, ? I used a 10 kHz to 182 MHz FM signal here. I put myself in zero span, and the sweep time at 4msec. You can see the modulating signal, because I shifted the frequency of the E4407B to do slope demodulation (I don't have the demod FM option). So, we see a sinusoidal signal. At 4msec of sweep time, the signal is visible, but from 3msec to 20 usec nothing is seen. The range of 3ms to 20usec of sweep time is the range that the AYX option normally gives for 401 points. ? I guess you have different behavior with your AYX option. ? Yves De?: [email protected] <[email protected]>
De la part de Mark Bielman ? Yves, ? My unit has this option, apparently no license required. I can set the sweep time to 20us but I am not sure what test you are doing. ? Are you saying that 20us sweep time is NOT displayed on the SA screen? ? Mark ? From:
[email protected] <[email protected]> on behalf of Yves Tardif <yves_tardif@...> ? Hi, ? I was lucky enough to find an E4407B, it was defective but I managed to repair it. Currently, I'm doing performance tests to see if everything is working properly. I am at the stage where I have to test the sweep time. This Spectrum has the AYX Fast sweep time domain option. It is written in the Specifications Guide: ? Basic configuration sweep time for span = 0 Hz => (sweep points-1)/100kHz to 4000 sec or 10us to 4000sec for 2 points, and 4msec to 4000sec for 401 points. ? option AYX Fast Time Domain sweep time for span = 0 Hz => (sweep points-1)/20MHz to 4000 sec or 50ns to 4000sec for 2 points, and 20usec to 4000sec for 401 points. ? The AYX card is detected, and it appears in the HARDWARE or SYSTEM menu. Moreover, when I do the sweep time test, the signals appear on the BNC connectors at the back of the unit and are normal, so this card seems to work properly, but the sweep time is functional with a trace displayed on the screen, up to 4msec for 401 point, as if the AYX option was not installed. However, if I remove the card, for 401 points, the sweep time refuses to go lower than 4ms, with the card, the same test shows a minimum sweep time is 20usec as written in the technical document about this AYX option. ? In the installation manual, it seems that just inserting the card, activates this function, there is nothing else to do...there is really little detail. The card is in slot #3, I tried in slot #4 for the same behavior. ? Anyone have an idea, is the card defective? ? -Yves |
KB2LMN
Martin
Sam Reaves