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Re: I'm officially lost now with this 8753ES

 

Yes, PNG is great for screen shots. The problem with the 8753D/ES graphics is that the firmware guys didn't do the best job. They added a graphics dump, but they only implemented jpg. To make it worse, you can't download it via GPIB, it has to be stored to a floppy. At least, I don't see a command to download the JPG via GPIB. If anyone here knows how, please let me know.

In order to make the process simple, I use John Miles' utility, but that one does not have PNG. It does have GIF and BMP (in addition to PCX). Next time, I will try a GIF. One of our forum members here sells a product which can do screen grabs via GPIB, but I haven't tried it. That almost certainly can produce a PNG. Anyway, I will stop here and we can discuss this in a new thread, if desired.

Vladan
Re: HP 3563A (3562A) A9 FFT

morestainless
 

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.??
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
Re: I'm officially lost now with this 8753ES

 

¿ªÔÆÌåÓý

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.?


Peter

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

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
Re: I'm officially lost now with this 8753ES

 

¿ªÔÆÌåÓý

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.?


Peter

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

YO Coil Drive Test-1.jpg

Re: I'm officially lost now with this 8753ES

 

¿ªÔÆÌåÓý

What is the file you sent? ?Neither my iphone nor Win10 machine knows what to do with it.?


Peter

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>
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


YO Coil Drive Test.pcx
YO Coil Drive Test.pcx

Re: 8662A output oddity

 

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, 18 Mar 2019, 12:43 Jim Miller, <hpagilent@...> wrote:
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

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
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
Re: 5385A error 52

 

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
Re: HP 83592 - Low output power on low bands

Pete Manfre
 

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...

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...

Yig Filter Pin SW 1.JPG

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
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
Re: 8662A output oddity

 

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
Re: 8662A output oddity

 

Hi, there should be a lit star in the upper right corner for settings which not give a calibrated display, right?
G?ran
Re: 8662A output oddity

 

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.
--------------------------------------------

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
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

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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