Re: HP 3563A (3562A) A9 FFT
Anybody have a working A9 FFT board for this machine they would part with?? 3562A and 3563A? use the same board.? Signature analysis shows the global bus chips U511 - U518 are bad as are the two coefficient ROM's - U315 and U317.? Firmware images would also be a possibility as the interface chips are cheap enough.??
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Re: I'm officially lost now with this 8753ES
On 3/18/19 2:05 PM, pianovt via Groups.Io wrote: Thanks, Daun. I posted the image in the .pcx format because of the small
file size and crisp rendering. It seemed fine at first, but now it looks
like an icon. I guess groups.io is not set up for pcx. Your best bet is to use PNG for this. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: I'm officially lost now with this 8753ES
I was able to see Daun¡¯s image, thank you.?
The interesting thing is that my waveform starts somewhat higher. This may be very significant. I did verify that the analog bus is reading correct as the voltages shown match up within tight tolerance to my calibrated scope. I will know quickly when I receive that replacement phase lock board from Pete whether this is the root cause or not.?
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On Mar 18, 2019, at 2:05 PM, pianovt via Groups.Io < pianovt@...> wrote: Thanks, Daun. I posted the image in the .pcx format because of the small file size and crisp rendering. It seemed fine at first, but now it looks like an icon. I guess is not set up for pcx.
Vladan
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Re: I'm officially lost now with this 8753ES
Thanks, Daun. I posted the image in the .pcx format because of the small file size and crisp rendering. It seemed fine at first, but now it looks like an icon. I guess groups.io is not set up for pcx.
Vladan
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Re: I'm officially lost now with this 8753ES
Hi Peter
It's an image file.? I was able to open it with Irfanview.?? I just
saved it as a JPG for you.
Daun
On 3/18/2019 1:41 PM, Peter Gottlieb
wrote:
What is the file you sent? ?Neither my iphone nor Win10 machine
knows what to do with it.?
On Mar 18, 2019, at 1:35 PM, pianovt via Groups.Io < pianovt@...>
wrote:
I checked the YO drive on a couple of 8753ES (Opt
006). Both are very similar. The unit below has a alightly
lower voltage at the start. The other one is right at 3.5V.
Vladan
<YO Coil Drive Test.pcx>
--
Daun E. Yeagley II, N8ASB
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Re: I'm officially lost now with this 8753ES
What is the file you sent? ?Neither my iphone nor Win10 machine knows what to do with it.?
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On Mar 18, 2019, at 1:35 PM, pianovt via Groups.Io < pianovt@...> wrote: I checked the YO drive on a couple of 8753ES (Opt 006). Both are very similar. The unit below has a alightly lower voltage at the start. The other one is right at 3.5V. Vladan
<YO Coil Drive Test.pcx>
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Re: I'm officially lost now with this 8753ES
I checked the YO drive on a couple of 8753ES (Opt 006). Both are very similar. The unit below has a alightly lower voltage at the start. The other one is right at 3.5V. Vladan
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Hi Jim I have not seen anything like this on my 8663A (not exact same instrument, but very similar). These generators has a are very modular build, with lots of cables between the boards. So it should be easy to find the source of the noise.? Get the service manual, and follow the signal, by measuring the signal between each model in the signal path, until you find the bad module/board.
Had to do this to find what board generated spurs at certain temperatures in my generator.?
Br, Askild
On Mon, Mar 18, 2019 at 01:31 AM, jfphp wrote:
There is something wrong with the settings of the SA : VF is too narrow compared with the BW filter. Try with auto for all settings.
All settings on the SA were set to auto. This is the "full band" view of the 8569B for the 0.1-1.7GHz band.?
The problem is not with the SA, the problem I am asking about is in the 8662A: the 8662 generates tremendous broadband noise as it sweeps across 1024.8 MHz as shown in the pictures. At *all* other frequencies it generates a very pure tone as expected.
73, Jim N8ECI
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Re: My $25 "In Poor Shape" 3468A has arrived
John and others following this,
The AZ(auto zero function) and Manual/Auto? functions are two different animals.
The AZ function shorts the input to the DC conditioning amplifier, U101, before each measurement of the customer's input to determine any residual offset of the input due to thermal drift and subtract that offset value from the input being measured.? ?So in principle if the input offsets drift over changes of time and temperature with a shorted input, the display will continue to read ZERO.?
Internal switches inside the input hybrid U102 are called? ? ?MZ -measure ZERO? and? MC -measure CUSTOMER (input)
With Auto Zero ON,? two readings are made for each measurement registered on the display:
[1]:? measure the offsets:? ?(MZ switch ON,? ?MC-measure customer switch OFF)? ? ? ? ? ? ? ?
[2]:? ?measure the customer input:? ?(MC switch ON, MZ switch OFF)? ? ? ? ? ??
[3}:? subtract [1]? from [2] and display the value
If the AZ function is turned OFF, the input remains static with the input constantly applied to the input of U101.? The reading rate in this condition is effectively doubled because the MZ and MC switches are no longer being toggled and all measurements are a measure customer with no new offsets being measured.? The ZERO from the last time AZ was active is subtracted from the customer input until AZ is turned on again.? So if you have AZ turned OFF, it is a good practice to turn it on periodically to get a new ZERO reading if the environment is unstable that may cause the input offsets to drift.
Manual range and Auto ranging is independent of the AZ function.? ?The meter can stay fixed on a given range or auto range with or without the AZ function turned ON.
Hope this helps you,
George? ? ? ? March 18, 2019? ? 11:02 am
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Re: E8357A upgrade questions
Caesar
I am interested in getting the CPU and hard drive. Sent a PM.
1. Is there anything special I need to do for the install? I thought I read somewhere that my front panel needs to be changed? I assume the Bios on the new CPU will be OK.
2. Can I easily revert back if I have an issue??
Tom
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In a few day , I will able to check the hp5386 with the Nationa GPIB PCMCIA card . I suppose the hp5386 is very similar to your counter.
Im not shure to understand very well the problem : you must wait the time out to get response from the counter ?.
If that is your problem / question , there is something not working properly or the setup is not ok , like the string terminator for example.
Best regards
Maurizio
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Re: HP 83592 - Low output power on low bands
I might have a complete spare for a 592 that if I remember has level issues.? ?I will have to look if you are interested.?
Pete wa2odo
On Mon, Mar 18, 2019, 9:34 AM ON7MA < on7ma@...> wrote: Hello
does anybody have a spare part or old HP83592 A/B/C for sale ?
It seems that the RF switch in the End Module HP SYTF ( Yig Filter ) is broken
The part is 5086-7404
I dont think it is repairable
JP
The lower signal does not come through.. control tension is present...
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HP 83592 - Low output power on low bands
Hello does anybody have a spare part or old HP83592 A/B/C for sale ? It seems that the RF switch in the End Module HP SYTF ( Yig Filter ) is broken The part is 5086-7404 I dont think it is repairable JP The lower signal does not come through.. control tension is present... 
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Re: HP 5335A power supply check
Hi Dan,
Considering that your serial number is 2510A, you need the correct manual. I posted an updated manual on the KO4BB site, so feel free to get it there. The change in voltage on the power supply rail was called out in one of the addenda also posted with the manual).
1) At serial number 2336A and above, the +15.7 V specification changed to +15.000 V. So, even though the 5335A is very forgiving, I would align the counter supply to that +15.000 V voltage.
2) IIRC, the procedure you mention calls for the interconnect cable to be removed, and for pins 1 and 16 on the A1 power supply board be shorted in order to bring up the supply (please carefully check my recollection). The power supply will not power on with the cable removed unless these two pins are shorted together.
I work on these units quite often, so please let me know if you have questions, and I will try to answer them. Congrats on acquiring a great instrument!
Regards,
Joe, KN5U
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Re: HP 5335A power supply check
Dan,
There was an addendum that change the power supply voltage from +15.700 to +15.000 VDC. You may download an updated manual from the KO4BB Manuals website along with all updates and addenda.
In order to power up the supplies with the interconnect cable removed, you must install a temporary jumper across pins 1 and 16 (please verify my recollection).
regards,
Joe, KN5U
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On Mon, Mar 18, 2019 at 01:31 AM, jfphp wrote:
There is something wrong with the settings of the SA : VF is too narrow compared with the BW filter. Try with auto for all settings.
All settings on the SA were set to auto. This is the "full band" view of the 8569B for the 0.1-1.7GHz band.? The problem is not with the SA, the problem I am asking about is in the 8662A: the 8662 generates tremendous broadband noise as it sweeps across 1024.8 MHz as shown in the pictures. At *all* other frequencies it generates a very pure tone as expected. 73, Jim N8ECI
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Hi, there should be a lit star in the upper right corner for settings which not give a calibrated display, right?
G?ran
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There is something wrong with the settings of the SA : VF is too narrow compared with the BW filter. Try with auto for all settings.
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On Sun, 3/17/19, morestainless via Groups.Io <lancelotburt@...> wrote: Subject: Re: [HP-Agilent-Keysight-equipment] 8662A output oddity To: " [email protected]" < [email protected]> Date: Sunday, March 17, 2019, 11:41 PM Congratulations on your fine acquisition.? I just got mine going.? Got some voltage and calibration adjustments to do? On Sun, Mar 17, 2019 at 3:32 PM, hpagilent@...<hpagilent@...> wrote: Hi, I recently acquired my first 8662A and while looking at its output on a spectrum analyzer I notice that there is a strange behavior that takes place in an approximate 2MHz span centered on 1024.8 MHz. At 1024.8 the noise floor increases by about 20dB and when tuning on either side of 1024.8 the noise floor decreases until it is completely back to normal at +/- 1 MHz on either side. I have included two pictures - one showing normal behavior and the other with the output tuned to 1024.8. This does not seem to happen at any other frequency in the unit's range. Has anyone else seen this? Thank you! 73, Jim N8ECI
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Re: I'm officially lost now with this 8753ES
Thank you for all that info, it will be helpful.
Regarding my problem, I am still not sure where it is located.? It could either be in the phase lock board or the source assembly.? I will know for sure when I get the replacement phase lock board.? The YTO tuning voltages are enough off from what the service guide says that it could go either way.
With a signal generator as external source, at 1 MHz the unit locks from roughly 500 kHz to 4 MHz so this means the pretune must get to that range (there's the 3.8 MHz osc to work with too).? 200 MHz high is way off.
It might be interesting to feed the YTO with a power supply and see what currents are required at different target frequencies and compare to what the default pretune is in my unit.
To be continued...
Peter
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On 3/17/2019 8:25 PM, pianovt via Groups.Io wrote: On Sun, Mar 17, 2019 at 10:08 AM, Peter Gottlieb wrote:
Regarding the A3 source PCB, I see that it has two 12 bit DACs and a quad
8 bit DAC.? It also has OC drivers for the switchable attenuator that is
an option in the 8753ET.? Does anyone know what all those DACs are used
for?? The coild drive for the YTO comes from the A11 board, so all that's
left are the FM coil on the YTO and the tune input for the 3.8 GHz cavity
oscillator.? What am I missing?
The DACs are part of the leveling loop. In addition to setting the power level, there are various breakpoints and offset adjustments for the level detector and logamp, a slope adjustment, etc. On the ES (and maybe also D), the ALC range was expanded which made this loop very difficult to control.
Also on this board is the bias and temperature compensated varactor drive circuit for the 3.8GHz oscillator. Then, there are also power supply filters for those microcircuits underneath. As far as I remember, the main coil drive merely passes through this board. For Opt. 006 analyzers, there is all the drive circuitry for switching bands. The 8753D/ES analyzers with internal test sets all have step attenuators, so those are also driven from this board.
This board has given me problems more than once. It's a multi-layer board, so tracing it out could take a life time. I have had open vias on it, one board had a cracked pad where that huge power resistor solders in. The design is mecahnically fragile there, but production instructions required bending the resistor after it's soldered into place. I think that may have caused problems on my unit. I also had a leveling loop which oscillated.
But, I don't think any of this is related to your YTO tuning problem. Keep in mind that the reference channel is derived from the last thick film microcircuit. If you have a bad elastomer contact between the microcircuit and the SMA connector, it can cause problems. I can't however explain why the tuning is off only below 1 GHz RF out.
Vladan
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Re: Parting out hp85662A display unit
Thanks for the interest y¡¯all. ?They went as a lot very soon after the post. ?If anything goes awry in the transaction, I¡¯ll let everyone know. ?At least someone go a good deal and they¡¯ll be put to use. ?Correct on the A4A2&3; same for the A4A4 bandwidth boards.
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Dave McGuire
Jempi ( ON7MA )
G?ran Krusell