HP Agilent Spectrum Analyzer 8595E  CAL AMPTD error - Page 1
Forum section: electronics / repair

author: charlyd
author_rank: Frequent Contributor
timestamp: February 01, 2020, 04:37:06 pm
content: hello after i got my 8595E in a few days ago, and did some test i got a NBW gain failed error in CAL AMPTD. my optionlist is 004,041,103,130.i guess NBW is related to option 130 what can i do to fix this? ( last night the cal. AMPTD. was ok one time and 15 min later failed.)unit gives no errors at startup and no freq. uncal or somethingmy SG stops at 2100Mhz and apart from what i see on youtube from an other 8595E Sa, is that my BAND 1 looks bad/dead. is there a way todo a real test of band 1 2.75GHz - 6.5GHzi read on this forum to use my 5GHZ wireless and connect.. is that a good test?

author: charlyd
author_rank: Frequent Contributor
timestamp: February 01, 2020, 06:52:24 pm
content: For the second part of my question the YIG or YTF driver. i found a troubleshoot part in the manual for the YTF driver. chapter 4 verify the YTF driver.Are there simple measurement checks i can do, on or arround the YIG. to see if these are what they should be? as a diagnose.

author: Miti
author_rank: Super Contributor
timestamp: February 01, 2020, 10:25:59 pm
content: The display looks OK.

author: charlyd
author_rank: Frequent Contributor
timestamp: February 02, 2020, 12:57:24 am
content: hi miti, thanks for your response. i think in the middle picture i miss some harmonics..about 2 div. amptd is overall slightly low.

author: analogRF
author_rank: Super Contributor
timestamp: February 02, 2020, 04:05:01 am
content: Quote from: charlyd on February 01, 2020, 04:37:06 pmthe picture does not show how your band 1 is. It looks normal. The harmonics of cal signal above 2.9GHz are very small.you calibration values dont look ok. see the service manual, there you can see a sample of normal cal constants.if the calibration fails intermittently (passes sometimes and fails sometimes) it is likely that your attenuator has bad contacts. I have had that problem in 8596E and 8595E, both cases it was the attenuator which is repairablethe amplitude is way too low in that calibration picture.try to play the attenuator contacts several times and then run the cal againHowever, it can also be something wrong in the RBW filters...your LO is fine, dont waste time on troubleshooting the YTO and specially not the YTO driver. If there is a hole in the YIG sweep, you can search for it with a small span and moving the center freq, if YTO amplitude goes down at some point you will get freq uncal or unlock error. I am pretty sure our YTO is fine..."amplitude out of spec for >3GHz" can mean a lot of things, it does not necessarily mean SYTF is bad. You need to first observe what the "out of spec" is.

author: charlyd
author_rank: Frequent Contributor
timestamp: February 02, 2020, 09:56:17 am
content: this is the pictures after i  preset. yes it is low all over the bands from what i found on youtube.. see pictures attached to this post.ok my attenuator have bad contacts you say, that can be a good check.. you are talking about A3A5 i assume..the attenuator which is repairable..yes indead the ampltd is very low if i compare again...so is it that you try to tell me that if the YTO or driver fails /is wrong, i should get one of these errors: freq uncal or unlock error.and confidence test is also succesfull.i dont get these that s true.!@analogRF you say :try to play the attenuator contacts several times and then run the cal again. did you open the attenuator itself? if yes what is there to do maybe?or do i understand you wrong?i was looking in the manuals i have but where do i get the cals examples where you talk about aboveyou said : you calibration values dont look ok. see the service manual, there you can see a sample of normal cal constants

author: analogRF
author_rank: Super Contributor
timestamp: February 02, 2020, 03:09:25 pm
content: the amplitude is not low all over the band. The 300MHz is right at -20dB as it should be. the first few harmonics are also goodthe small differences are due to calibration. your cal constants dont look normal, compare with sample values in the service manual.it does seem your high band might be dead or very off tuned. still it does not necessary mean the SYTF driver is bad, in fact most of the timeit is the SYTF itself that is faulty or it could be out of cal. You do need a sig gen that goes beyond 3GHz, even a cheap ebay synthesizer board would help. Just playing with the SYTF driver when you dont have any means to check signals in that band is waste of timestill I would suggest you first make sure the attenuator is ok and consistent and then try to fix the issue of AMP CAL first (that should be fixedeven if the high band is bad). Just play with the attenuator many times when you are at 300MHz center freq and cal signal connected. If the amplitude remains constant by changing attenuator, it means it is working ok. Search the forum for attenuator repair, also there are videos on youtube. If you are very careful you can open the attenuator and clean the contacts and change the tiny rubber o-rings that get stiff or even break apart by aging.

author: analogRF
author_rank: Super Contributor
timestamp: February 02, 2020, 03:28:51 pm
content: no, I didnt mean you should open the attenuator right away! First just check the contacts and see if it has any problem. I meant play with the contacts from the front panel up-down keys and see if the signal amplitude remains constant. if it doesnt then attenuator has issueshave you run the service routines in chapter 4? That should be your starting point. They test quite a bit of the hardware including the YTF driver. If one of those service routines fails then you can follow the troubleshooting.sample/default CAL data is in the service manual, somewhere towards the end of the manual, maybe chapter 13 or 14 ...also some of the basic adjustments in chapter 2 can be done without any sig gen. I think high freq sig gen was only needed for freq response adjustment , everything else can be done quite easily. But first you need to find out the problem with CAL AMP failure. Do the service routines first

author: Miti
author_rank: Super Contributor
timestamp: February 02, 2020, 03:54:48 pm
content: The easiest way to check the attenuator is to apply a 0dbm within the frequency range of your SG, span about 10MHz, place a peak marker then play with the attenuation. The peak marker reading should stay at or very close to 0dbm. If it changes between iterations or it bounces, you need screwdrivers.

author: charlyd
author_rank: Frequent Contributor
timestamp: February 02, 2020, 05:01:41 pm
content: maybe it is good to say i dont have a SG which goes into band 1. i have one on e the bench wiating for this SA to be working ;-)and i have a working SG HP 8656B ( upto 990Mhz ). so i can do some test. this having said…i addend the sample above under the #1 pictures. what does it say?i have option 130 installed. i read somewhere that a quick test -to see if it is related to #130- is pulling the board a do a new FREQ. followed by a AMPTD cal. this way i make my troubleshoot area smaller.is that right, or am destroying crucial settings?for option 130 there should be a foldout 11-1. to see how it interacts with the unit. couldn t find iti will go through chapter 4 tomorrow.@Mitithanks testing tips for the attenuator. i love them, which can make much progression with little effort.

author: charlyd
author_rank: Frequent Contributor
timestamp: February 03, 2020, 08:30:38 am
content: hi from what if found it looks like my 08591-60055 is broken as many people have this issue. a new card is on its way..BTW while making this unit to be a future workbench gair. does anybody have firmware updates. ( if i am right we are talking about the content of 4 eproms )and for the 8595e the latest version i found wasfw.980615can anybody upload these?

author: Miti
author_rank: Super Contributor
timestamp: February 03, 2020, 11:57:18 am
content: Quote from: charlyd on February 03, 2020, 08:30:38 amHow did you conclude that? That is an option card, you can remove it and the SA should still work , is just that the RBW can’t go below 1kHz if I remember. You may be rushing things.Edit:Quote from: charlyd on February 03, 2020, 08:30:38 amWhat version is your FW? My 8594E has 980615, the 8591E has 9803xx and still works well. I don't know if it's worth upgrading.

author: analogRF
author_rank: Super Contributor
timestamp: February 03, 2020, 12:14:46 pm
content: totally agree with Miti here

author: MarkL
author_rank: Unknown
timestamp: February 03, 2020, 01:46:21 pm
content: On the firmware question...https://www.eevblog.com/forum/testgear/hacking-old-hp-spectrum-analyzers/msg2287293/#msg2287293

author: Miti
author_rank: Super Contributor
timestamp: February 04, 2020, 07:08:07 pm
content: @MarkLI got somewhat intrigued by this FW upgrade thing and I compared what I have, with the binaries in that collection. My 8594E has 980615 but 8591E has 940315 so it could take an upgrade. The processor board is 08590-60342 and it has two AM27C020 EPROMs installed. If I look at the Rev. L 98.06.15, it has 4 hex files inside. Does it mean that, if I want to upgrade to 980615, I have to program/ populate all four EPROMS?Do they preserve the calibration map or it needs a full calibration after the upgrade?Do I get any benefits from doing that or it’s just a waste of time?

author: MarkL
author_rank: Unknown
timestamp: February 04, 2020, 08:43:19 pm
content: Quote from: Miti on February 04, 2020, 07:08:07 pmYes, you need four EPROMs starting with version 95.02.21.I also have a 8591E with an old version processor board, 08590-60356. It currently has four 95.09.14 EPROMs installed.QuoteThat's an excellent question but I don't know. I did an upgrade on a 8595E and I don't recall that it wiped out the cal data, but there were other problems with that unit.I'd highly recommend you follow the "fill-in-the-chart" cal backup procedure in the service manual before attempting to move to a different version. (You should do the backup anyway, as a matter of good care and feeding if you haven't already done so.)QuoteSome of the fixes in that above linked post/document have some fairly concerning bugs that were resolved. Like, "CAL data loss, DLP erasure, blank-screen lockup, etc." Unfortunately, it's really not enough information to know anything about the bugs or the conditions that cause them.I personally like running the latest available on my TE. Shame on me if I stumble across a bug that's already been fixed and then it ends up wasting even more of my time by interrupting my work AND doing the upgrade.I wouldn't make it emergency. Order some EPROMs and do it when you have some spare time. I would keep the old EPROMs handy so it's easy to go back if something goes sideways with the "new" EPROMs. They'll likely be pulls.

author: Miti
author_rank: Super Contributor
timestamp: February 05, 2020, 02:06:21 am
content: Thanks Mark!Yes, that was the first thing I did when I got it, I saved the calibration data. But is the flatness data and the attenuator corrections all I need to save? It is not too much to restore if needed, but I see much more data there.Also, I quote from the revision history: "Intro of 2X memory (4 2-megabit EEPROMS)". Do you know what EEPROMs are used? 27C020 is an EPROM not EEPROM.

author: MarkL
author_rank: Unknown
timestamp: February 05, 2020, 02:28:40 am
content: Quote from: Miti on February 05, 2020, 02:06:21 amThe 8591E needs timebase, flatness, and attenuator to be backed up. Once this data is restored, you can run the self-cal procedures described in the section "Instrument Calibration after Reloading the Correction Constants" to re-compute everything else.The 27C020 is certainly an EPROM. "EEPROM" in that document is a typo. I've done the same thing many times myself. I hardly ever deal with EPROMs anymore and my fingers are always typing "EEPROM" instead.https://octopart.com/search?q=AM27C020&currency=USD&specs=0

author: charlyd
author_rank: Frequent Contributor
timestamp: February 06, 2020, 03:41:43 pm
content: for the Original Eproms do we talk about the 120ns or the 150nsbtw assuming each model has it own eprom version, what is the latest version for the 8595E ?or are all software versions of series 859X compatible for all unit of the 859X series so version from the 8594E can be used in the 8595E? would sound really strange for me.

author: MarkL
author_rank: Unknown
timestamp: February 06, 2020, 06:41:23 pm
content: Quote from: charlyd on February 06, 2020, 03:41:43 pmThe ones I pulled out of my 8595E when doing the upgrade are 150ns (08590-80216 and 08590-80217, both AM27C020-150DC). So, 150ns or faster will work. I didn't analyze the processor read cycle time, so I don't know if anything slower, like the 200ns version, would work.At some point, HP moved from 1Mb to 2Mb EPROMs. If you have a model with 1Mb EPROMs and you want to upgrade to the latest version for 2Mb EPROMs, I think you have to adjust some jumpers to accommodate the larger EPROMs. The jumpers are shown in the CLIP schematic, but there's no table saying how they should be configured. Maybe it's buried in a document somewhere, or it could ultimately be worked out from the schematic.The EPROMs are the same for all the 859xE models, but there are some subtleties for older models described here:https://www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=458427&nid=-11143.0.00&id=458427

author: charlyd
author_rank: Frequent Contributor
timestamp: February 07, 2020, 03:57:45 pm
content: Hi MarkL great post thanks ok in my 8594E it is fw. 98 06 15 can i connect that with a letter still L or M ?... but dont see the logo so no M i assume ;-)my 94E has the Tadinran Battery boarding my 95E has the yellow CR2477 bat. on the ram board. i think i will add the jumpers and more info if i see differences.So markL your experience is that i don t need todo other settings then rerun the internal well known Freq. & Amptd Cal. after i swapped out the eproms

author: MarkL
author_rank: Unknown
timestamp: February 07, 2020, 07:15:23 pm
content: Quote from: charlyd on February 07, 2020, 03:57:45 pmMy recollection is that cal constants (flatness, etc.) were preserved across an upgrade, but ALWAYS do a backup.As far as that document is concerned, M only adds the Agilent logo. But you say "no logo"? You should see the "hp" logo in the upper left. If not, your display might not be adjusted correctly.

author: charlyd
author_rank: Frequent Contributor
timestamp: February 07, 2020, 09:02:40 pm
content: aaah in the upper left corner yes i think so yes.. i thought when powering on a big logo but ok i understand. thanks!

author: Miti
author_rank: Super Contributor
timestamp: February 07, 2020, 09:22:30 pm
content: I don’t think that’s the logo they are talking about. My 8591 with 84 version still shows the logo.

author: charlyd
author_rank: Frequent Contributor
timestamp: February 08, 2020, 04:34:04 pm
content: So maybe still a big HP BOOT logo.ok today i did some diagnosing about the CAL AMPTD failed. i removed option board 130 and placed jumper W1 on the log ampl. and then did the cals again. and yes passed....CHECK!+-+ YIG Problems +-+but still my amplitude is a bit low and gone after 2.9 GHz .. and it think it has todo with YIG problems. So time for real testing But how can i test that without have a SG above 2.1 GHz. Does YTF cal in the unit say anything.Are there some tips , things you need to know/do to find out the band 1 is ok or not ok+-+ option 130 board +-+i understand there is not much info or schematich on the Option board 130.But who has debugged the board? any points to start maybe.i see some testpoints on the option 130 board (TP) is it handy to get an extension card for it or is there not really anything to repair on that board?Who jumps in...

author: Miti
author_rank: Super Contributor
timestamp: February 09, 2020, 02:28:31 am
content: Buy one of these:https://www.banggood.com/35M-4_4GHz-PLL-RF-Signal-Source-Frequency-Synthesizer-ADF4351-Development-Board-p-1129041.html?rmmds=myorderand one of these:https://www.banggood.com/3Pcs-3_3V-8MHz-ATmega328P-AU-Pro-Mini-Microcontroller-With-Pins-Development-Board-For-Arduino-p-980290.html?rmmds=myorder&cur_warehouse=USAEdit: You'll need one of these as well:https://www.banggood.com/3_3V-5V-USB-to-TTL-Converter-CH340G-UART-Serial-Adapter-Module-STC-p-1232728.html?rmmds=search&cur_warehouse=CN

author: charlyd
author_rank: Frequent Contributor
timestamp: February 16, 2020, 08:43:53 am
content: ok i have two problems. For one problem i got an other option 130 board 08591-60055 in and the tested that in the 8595E .. result Working now.This rises the next question is it possilbe to repair the board.so i can use it in my 8594E. now i have two boards and i can compare for diagnosing. i saw a lot of test points and this block diagram of the Narrow resolution bandwidths.are there extender boards for these models SA?connector type :AMP Brand 5-534204-5 on the card. ( see picture )connector type:AMP Brand 5-102567-4 on the motherboard ( see picture ). -> Connector Header Through Hole 60 position 0.100" (2.54mm)If somebody can help me out with one or both of these connectors from a broken card or motherboard, please pm me.it is a start.

author: charlyd
author_rank: Frequent Contributor
timestamp: February 17, 2020, 10:04:34 pm
content: In post #5 i was told by@analogRF you say : try to play the attenuator contacts several times and then run the cal again. i decided to refurbish the attenuator rubbers.

author: analogRF
author_rank: Super Contributor
timestamp: February 17, 2020, 11:06:20 pm
content: Quote from: charlyd on February 17, 2020, 10:04:34 pmwas it intermittent? if it was not, there is no need to mess with it really. Mine was intermittent and although it would work perfectly for a long time after playing the contacts several times but if i didn't use the SA for a couple of weeks, then the next time it would go crazy again so I had to repair it.It's just the o-rings that dry up and break apart. Dont use any kind of oil. I bought a bag of o-rings from china and they have worked for me on many occasions but how long they will last I will never know...

author: Miti
author_rank: Super Contributor
timestamp: February 19, 2020, 02:54:48 am
content: Quote from: MarkL on February 05, 2020, 02:28:40 amI ordered 5 EPROMs from UK, erased them, programmed 4 of them and my HP8591E has a new firmware, 980615. The only side effect was that it initialized the user memory and I've lost the EMC personality but that was quickly re-loaded. The calibration did not remapped, it stayed the same.Edit: It passed calibration and confidence test after upgrade.

author: Bicurico
author_rank: Super Contributor
timestamp: February 19, 2020, 02:11:04 pm
content: Hi,I have a HP 8594E with the CAL AMPTD error.I built the crystal shorts (but the resistors I used add up to 89.x Ohm instead of 90.0 Ohm - hopefully that is not critical).Then I followed the first part of 2.5 Crystal Alignment.I got a much better Marker Delta as described on page 52.This did not fix the CAL AMPTD error.So i carried on with the LC Alignment and LC Centering. This did not fix the CAL AMPTD Error either.I then tried the LC Amplitude correction, but was not able to finish it due to wife calling...However, the LC alignment and centering instructions seem wrong to me - it seems that the author did a copy&paste of the steps to move the shorts and they make no sense. I did follow this, positioning the shorts as I thought it should be, but I am not 100% certain I did it correctly.I will try to repeat this ASAP.Any suggestions, tips and tricks are welcome.Thanks,Vitor

author: analogRF
author_rank: Super Contributor
timestamp: February 19, 2020, 02:39:14 pm
content: CAL AMPTD error is not always the result of filter misalignment.also you dont need to mess with all filters...just notice on which RBW(s) you are getting bad results.in any case I would mess with filter alignments as a last resort after everything else is ruled out...

author: Bicurico
author_rank: Super Contributor
timestamp: February 19, 2020, 03:09:02 pm
content: I tried to swap A13, A12 and A11 between a known good unit and the problem remained. I assume that A13 and A11 need to be aligned for each specific SA, but I was kind of hoping that swapping A12 would solve the error.As it did not, I tried to do the crystal alignment. Truth is that I never had done it before and as a hobbyist, reading the manual is not 100% clear, so it took me a lot more time than expected and I still am not 100% sure I did it right.Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: February 19, 2020, 06:40:23 pm
content: Quote from: analogRF on February 19, 2020, 02:39:14 pmCAL: RES BW AMPL FAIL occures when Res BW is set to 3MHz.Any ideas?Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: February 19, 2020, 07:14:00 pm
content: After tuning LC it fails at 300kHz.

author: analogRF
author_rank: Super Contributor
timestamp: February 19, 2020, 07:27:58 pm
content: I would try to troubleshoot the circuit board first and if all signals are ok then proceed to mess around with the tuning. at least that's how I approach my repairs.all RBW >= 100KHz are handled by the two LC filters. The two crystals are shorted by a FET or MOSFET i think. If that Fet is not shorting the crsytalwhen RBW>=100KHz, then you get errors. Different RBW>=100KHz are selected by changing the bias on two varactors in the LC filters.so you must make sure those 4 BW control signals are coming and they are within range and the bias transistors (for the varactors) are OKif the biasing transistor is ok in one of the LC poles and dead in the other you can tune it kinda half ass but it will fail in some of the RBWsthere are 3 BW control signals that come into the bard and a 4th one is generated from one of them on the board. I dont have the schematicon my work computer here to tell exactly where and what they are...so I would suggest you first focus on the BW control signals being in rangethe varactor biasing circuit being ok and the XTAL filters being shorted by the FET or MOSFET when BW>=100KHzif all is ok then perhaps tuning will be necessarythere are quite a few things that can go wrong on that board, it's not just the alignment. I think sometime ago someone had a problem where a capacitor on that board was drifted in value quite a bit...so I guess that could be one possibility too even though it's rare...

author: charlyd
author_rank: Frequent Contributor
timestamp: February 19, 2020, 08:36:54 pm
content: unless, you have option 130. it is a easy check to pull the option board . it fixed mine.after that i put in a other 130 board and all in calibration. but of course not all amptd errors are related to the 130 board. and for sure when it is not in..so my last repair point is the amptd is a bit low ( see below) . But i found a new rubber set so i wanna swap them. i saw this could be an easy job and worth doing to refurbish the attenuator.Comparing both pictures. Leftside -Internet Picture- and rightside -my picture-.My amplitude looks much less from what i see from nearly all harmonics..

author: Bicurico
author_rank: Super Contributor
timestamp: February 19, 2020, 09:02:00 pm
content: I am getting CAL: SPAN SENS FAIL now...arghhh!

author: analogRF
author_rank: Super Contributor
timestamp: February 19, 2020, 09:11:26 pm
content: you need to go back to the basics, I bet the original error was not even because of the RBW filters...check the supplies for voltage and ripple and run the self diagnostic tests in the manual and see what you get for different tests

author: charlyd
author_rank: Frequent Contributor
timestamp: February 21, 2020, 08:05:55 pm
content: hello how can help me out with the Part Number: 08595-90001 (Mar91. The 8595A is no longer sold by Keysight)

author: analogRF
author_rank: Super Contributor
timestamp: February 21, 2020, 08:16:18 pm
content: you mean this?https://literature.cdn.keysight.com/litweb/pdf/08595-90001.pdf?id=834233why do you need this manual? yours is E model which is very different

author: charlyd
author_rank: Frequent Contributor
timestamp: February 22, 2020, 10:22:22 am
content: hello ah yes this is the one thanks analogRF. ah ok.. is it really so different,i came across the PDF tip somewhere on the keysight forum. so now i understand it is not very usefull then.So back to the 08590-90316.pdf, 8590DE-CLIP.pdf, 8590E-L-CLIP.pdf. that is already a lot but maybe there is something i missed. Is there more usefull documentation for the 8595E?i try to figure out if there is a way of simply testing my YIG. without have specific tools. i got the tip to order a cheap chinese SG which goes to arround 4GHz but with all the issues in china this can take up month to arrive.i ordered a 5.6" LCD in china it will arrive in june somewhere they told me, the supplier live in the corona area.i mean is there something to compare. like the yig input/output ( with the Cal signal connected or so. )for example, what should i see on the input?did anybody do some measurements in "the none working" situation and later in the "the working situation".i found this.

author: analogRF
author_rank: Super Contributor
timestamp: February 22, 2020, 12:25:39 pm
content: as I mentioned multiple times before, your YTO is fine. It is working otherwise you would not see a stable signal at ANY frequency at allAlso you would get unlock errors. Just tune the analyzer to different frequencies with span < 2MHz and if you dont get unlock error, your YTO is working which I am sure it is. Dont need to feed any signal.your SYTF is probably not working and the only way to check is to have a high freq signal generator, there is no other way around it. Even if it is the switch that is bad not the YIG tuned filter, still you need a signal gen to check out the output of the device and by t he way the switch is embedded within the YIG tuned filter, so if it is bad the whole YTF must be replacedif you have another SA that goes to 6.5GHz, one thing you can do is to use your YTO (of the 8595E) as signal generator and feed it to the SYTF of your 8595E and let it sweep and then look at the output of the SYTF on the other SA.Your YTO covers 3.92-6.82GHz when you sweep from 0 to 2.9GHz (up conversion) and it covers 3.12-6.82GHz when you sweep from 2.8 to 6.5GHz (down conversion). 8595E does not use LO harmonics for mixing in the high band.EDIT: actually if you have access to another SA, you can just simply use the LO output of that SA as a signal gen and feed it to your 8595E and check the high band. Dont need to disassemble any cables.

author: analogRF
author_rank: Super Contributor
timestamp: February 22, 2020, 12:27:42 pm
content: have you tried all the diagnostic tests in the service manual? I think one of the tests checks the YTF driver and at least you can see if the driver is ok

author: MarkL
author_rank: Unknown
timestamp: February 22, 2020, 06:16:38 pm
content: I noticed that the CAL output is not looking clean. Perhaps I've not seen enough CAL outputs on this series, but I've never seen one with a spur in the middle. See photo.Maybe there's something wrong with the CAL output? Is that spur around 800MHz? Can we get a closer look at it? What is the exact frequency?I'm assuming you don't have another SA. What model SG do you have? If it has a flat output you could at least confirm most of the low band is ok. You could use your SG to slowly sweep the range up to 2.1G and look for anomalies. Turning on trace B and setting it to MAX HOLD can be useful to capture the envelope at the same time. Use the same settings you used for the cal screen shot.If the envelope is flat, maybe it's the CAL output and for some reason the harmonics are dropping off at the higher end.Can you find a frequency on the SG that causes a spur at ~800MHz?If you reduce the RBW to lower the noise floor, can you see the CAL signal in the upper band? It looks like there's a tiny peak there.As others have said, a signal source that covers the high band is really needed. Among the other suggestions, you could also get a passive frequency doubler (or other multiplier). They're relatively inexpensive. They need a fair amount of drive input from your SG, but they have a lot of good harmonics beyond double that could be useful for at least a go/no-go look at the high band. Minicircuits.com has a wide range of options (https://www.minicircuits.com/WebStore/Multipliers.html).

author: analogRF
author_rank: Super Contributor
timestamp: February 22, 2020, 06:22:35 pm
content: the CAL output is normal. It does look like that and does have a lot of harmonicsif you have access to another SA, as I explained, you can use th LO output of that SA as signal gen and crudely check your 8595E. it cannot show you how accurate the high band is because LO output is usually not that flat over frequency but at least you can check if there are any holes in freq response

author: MarkL
author_rank: Unknown
timestamp: February 22, 2020, 06:31:16 pm
content: Quote from: analogRF on February 22, 2020, 06:22:35 pmOk, thanks for the confirmation. Disregard my post.

author: analogRF
author_rank: Super Contributor
timestamp: February 22, 2020, 06:42:53 pm
content: oh, sorry, I just noticed you were talking about that extra spur just below 900MHz. That's not normal, it should not be there. Not sure if it's a byproduct of the SA. It could be the leakage coming from another device in the lab that is operating in that frequency (around 840-850MHz maybe?)Using high quality coax cable and connectors should remove or reduce it if that's the case.one thing that is wrong with that picture is that harmonics should be quite visibly larger even after 2.9GHz but they have disappearedeven below 2.9GHz on my units I see larger harmonic amplitudes. In that picture they fall off very quicklyit could be the frequ response calibration (flatness) that is wrong or lost or it could be the hardware....having a signal gen and checking the output of each stage one by one would quickly show the problem

author: MarkL
author_rank: Unknown
timestamp: February 22, 2020, 10:05:31 pm
content: Ok, so maybe the CAL output *does* need a second look.Unless I missed a clue to the contrary, my point was that all the observations and attempted cal runs done by the OP have assumed the CAL output is ok.I'm challenging that assumption because it's looking a little fishy to me with that spur in there. It's also possible the CAL output is fine, and the spur is a clue to some other problem. But my goal was to devise some way to show what level of confidence to have in the CAL output with the OPs limited equipment.Thesecondthird harmonic also looks a little asymmetric, but it's really hard to tell at that span. There could be additional garbage being obscured.It's possible to use the SG to provide the 10Mhz reference to the SA and move the reference frequency around a little. If that spur is an external influence, it should move around too.Looking at the full span with corrections off might also be interesting.Trying to think of what would be useful with the constraints of the equipment on-hand. Otherwise, with the right equipment, I agree this would take about two seconds.EDIT: Meant third harmonic.

author: analogRF
author_rank: Super Contributor
timestamp: February 24, 2020, 03:42:19 am
content: Quote from: MarkL on February 22, 2020, 10:05:31 pmcalibration of BW filters is done at CF=300MHz and the cal signal is fine there. So that should not be a problem.but the harmonics fall off too quickly and disappear in the high band which they shouldn't. Those two symptoms could be indicationof wrong flatness calibration, bad SYTF (hence no high band or very weak high band), or even mixer problems...I still think that spur is from the outside and maybe it even switches on and off and we only got a still picture of when it was onit is close to uplink and downlink of some GSM and LTE bands. I cannot think of any scenario that would generate that single spur frequencyin this instrument considering all the signal generation schemes that are used in 8595E... still I might be wrong and overlooking something...

author: MarkL
author_rank: Unknown
timestamp: February 25, 2020, 12:23:40 am
content: Sure, it could be a fleeting glitch in that screen shot.Poor to non-existent performance in the high band could also be the result of incorrect mixer bias. I didn't see any mention that the mixer calibration was attempted (CAL MXR).

author: charlyd
author_rank: Frequent Contributor
timestamp: March 02, 2020, 08:04:34 am
content: Guys thanks for all your replies, i will for sure check things later, but first have to wait a while for a good source which is maybe on the way._^___^^^-------\____/---------------------------------^^^^-------------------------------^^^--^^---- taking a long time these days…-----^^but from what i compared to an 8594E as far as the band goes of course the 8595E is arround -6dBm low over the whole spectrum

author: Tekton
author_rank: Newbie
timestamp: March 30, 2023, 10:52:48 am
content: Quote from: charlyd on February 16, 2020, 08:43:53 amHello. I purchased recently a 08591-60055 board. Do you think that works in a 8594E?Thank you

author: satcom
author_rank: Newbie
timestamp: March 30, 2023, 11:30:16 am
content: Quote from: Tekton on March 30, 2023, 10:52:48 amAbout two months ago I bought and installed the 08591-60055 on an HP-8595E.No problem at all!

author: Tekton
author_rank: Newbie
timestamp: March 30, 2023, 11:33:18 am
content: And to assembly it, does it matter which slot is used? The part of my manual referring to “A130 Narrow Bandwidth Assembly” section of Foldout 11-1 is missing. Could you give me some indication for its correct assembly?Thank you so much

author: satcom
author_rank: Newbie
timestamp: March 30, 2023, 12:30:29 pm
content: I hope the attached helps you!