¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: HP8594E : What is really needed when lost of cal data with dead battery?

 

Hi,

This sounds as something that should not be to difficult to automate with your favorite programming language.?
As long as you have a signal generator and power meter on GPIB, together with the SA, and as long as the SA accept setting these cal constants over GPIB.
I'm using Python for the few GPIB programs I have made.

It will of course probably take you as long time to research the GPIB commands, write the program and test it.
But it would very easy if you have to redo it at a later time. And if you share your program, it could save people a lot of time.
Of course other may have different generators and power meters, so then they would have to update the program.

Regards,
Askild


On Wed, Feb 9, 2022 at 4:20 PM tom_iphi via <iphi=[email protected]> wrote:
Hi Nicolas,

I can report from my calibration experience with an HP8593E. I assume there is no big difference in procedures to your HP8594E.
I purchased a used HP8593E to find that is was only calibrated to 18GHz. For the frequency range 18...27GHz there were no correction coefficients, so level readings were way off.

Calibration required a stable generator for the frequency range in question, a high quality splitter and an accurate power meter. You have to take a level measurement with the SA at every single correction grid frequency (there are many!) and write it down. You find those lists in the manual.
Then you have to enter all those numbers point by point into the instrument. I used the front panel keys to do that.
This may be automated via GPIB, but you still need to get the numbers into a computer.
It was very tedious and I refrained from re-calibrating the range below 18GHz. I do not ever want to do this again.
That's why in the same pass I replaced the CMOS memory battery. Now, I should be safe for another 10 years.

Best regards,
Tom

Re: HP detector

 

Hi!
Looking at the 1N831 data sheet, it appears that this is a fairly generic Silicon RF diode, and in fact looks like originally spec'ed as a mixer diode.. I am fairly sure that any HP leaded Schottky diode would work well here, like a 5082-2800 or 2817 type. Maybe even a BAT-85, which I have used on a crappy FR-4 board to over 1 GHz with pretty good flatness. The magic is the coaxial diode mount with the disk resistor & capacitor to give low parasitics in a ~50 ohm coaxial line circuit.
Jeff Kruth

In a message dated 2/9/2022 1:08:43 PM Eastern Standard Time, davewrightsplace@... writes:
?
The HP 8471A OEM diode is 1N831, and there are some on eBay. I have two on the way now.

Left to right in the photo is the input termination resistor, 50 Ohms, some sort of film deposited on the disk between the BNC male center pin and a contact ring to the case. The diode anode lead is soldered directly into the input center pin at 'zero length'. ?The cathode lead passes through the center of a disk capacitor, measured as ~1500pf, and on to the center pin of the output BNC female.?

The assembly process will require care in soldering, I imagine it will go as: input R first, then output C, then screw gold plated center into the BNC male body, solder BNC female center pin to protruding cathode lead, and thread main body over all.

Intend to measure performance on 8753D VNA when completed.

More as it happens...

Re: 8640B - No Count

 

Hi

You first need the first five characters of the instruments serial number.? There are some 8640B's that were made in Scotland which at first look more like they used parts of a 8640A.? Fifth character of serial number is a U.

George G6HIG
Re: 8640B - No Count

 

¿ªÔÆÌåÓý

I will pull the covers off tomorrow and have a look. I downloaded a rough copy of the service manual.

Is there a way to workout which of the versions the counter is.

The device is not mine but I would love to get it working as I have soft spot for them having used it to tune diplexers in the early 70s and liked them then.

Dave
VK6ZIP



-------- Original message --------
From: Brian <brianclarke01@...>
Date: 10/2/22 19:18 (GMT+08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] 8640B - No Count

Hello Dave,

?

I have the same problem. I found a self-proclaimed expert, but in the end he stopped communicating; his advice got me nowhere. The main thing I learned was that there have been many iterations of the counter, and a counter from one 8640B may not work at all in another, showing just the zeroes and decimal points you and I both get.

?

Please keep me in the loop if you find someone who can fix the counter module.

?

73 de Brian, VK2GCE

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Ireland
Sent: Thursday, 10 February 2022 9:20 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 8640B - No Count

?

I've borrowed a 8640B which as far as high level output works well.

The problem is that the counter on both internal and external selection shows all zeros with three decimal points thrown in.

There seems to be a lot of knowledge out there and heaps of discussion but I did not see one on just "0"s without flashing. Has anyone experienced this before?

Dave

Re: 8640B - No Count

 

¿ªÔÆÌåÓý

Hello Dave,

?

I have the same problem. I found a self-proclaimed expert, but in the end he stopped communicating; his advice got me nowhere. The main thing I learned was that there have been many iterations of the counter, and a counter from one 8640B may not work at all in another, showing just the zeroes and decimal points you and I both get.

?

Please keep me in the loop if you find someone who can fix the counter module.

?

73 de Brian, VK2GCE

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Ireland
Sent: Thursday, 10 February 2022 9:20 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 8640B - No Count

?

I've borrowed a 8640B which as far as high level output works well.

The problem is that the counter on both internal and external selection shows all zeros with three decimal points thrown in.

There seems to be a lot of knowledge out there and heaps of discussion but I did not see one on just "0"s without flashing. Has anyone experienced this before?

Dave

8640B - No Count

 

I've borrowed a 8640B which as far as high level output works well.

The problem is that the counter on both internal and external selection shows all zeros with three decimal points thrown in.

There seems to be a lot of knowledge out there and heaps of discussion but I did not see one on just "0"s without flashing. Has anyone experienced this before?

Dave
Re: 8560E Second Converter

 

¿ªÔÆÌåÓý

I'm trying to get my head around the LO amp, doubler and tripler circuit of the 8560E Second Converter.

Does anyone know to identify the transistor "Bz" and the propriety chip 1GXX-XXX?

Dave



Second Converter Reduced.jpg

Re: ESG-DP E4437B Signal Generation Issue

 

¿ªÔÆÌåÓý

If you are searching for chip replacement then Leo Bodnar is producing drop-in replacement, see:


-vf-



Dne 10.02.2022 v 7:06 bigpapak507@... napsal(a):

You are on the right track. The 1GC1-4210 chips tend to deteriorate over time causing the failure mode you described. Your other option is to find a 60019 board and replace it.?

Re: 8560E Second Converter

 

¿ªÔÆÌåÓý

Askild

I have a sig gen and a specan that both go to 3GHz.

The test point on the converter is labelled LO test and I assume that this is the 600MHZ but I see nothing on this even though the 600MHz input is correct. If however it is the 3.9Ghz, then I have no way of seeing this without mixing it to another frequency.

I can't see the output of the A8 Low Band mixer as it is again too high for my specan but the RF input is correct according to the manual at -21dBm and the drive voltages are -4.96V for the -5V rail and -4.14V for the -4V rail.

The 310.75MHz output of the converter when measured as per the manual is -59dBm where it should be -38dBm.? When I measure the voltage between the test connector J19 pins 15 and 6, the drive to the converter pin switch, I get +14.48V which is in the range of the manual.

The next item in the manual is measuring the mixer bias on the test connector J19 pin 1 where I get -39mV which is outside the required range of -150mV and -800mV. After that it just says if outside the range, probably the second converter is faulty.

The voltages to the second converter are:-

J12-1 Mixer Bias:??? ??? ??? ??? ??? ??? -39mV
J12-2 +5VF:?? ??? ???? ?? ?? ???? ??? ??? ??? 4.87V
J12-3 Analogue Gnd: ??? ??? ??? ??? ??? Yes
J12-4 +10VR:?? ??? ??? ?? ??? ??? ??? ??? ??? ? 9.9V
J12-5 Pin Switch:??? ??? ??? ??? ??? ??? 14.48V
J12-7 Drain Current Sense: ??? ??? 4.86V
J12-8 Drain Voltage:??? ??? ??? ?? ?? ?? 4.85V
J12-9 Doubler Bias:??? ??? ??? ??? ??? 14.48V
J12-10 Driver Bias:??? ?? ?? ??? ??? ?? 0.465V

Without the circuit of the converter I don't know the relevance of these but the only one that looks a bit strange is the doubler bias.

Do you have any thoughts after your experience?

I will pull it apart again and check out some of yours and Gerald's suggestions on the DC feeds, the feed throughs and where this LO test point comes from.

Thanks

Dave



On 8/02/2022 5:38 pm, Askild wrote:

Hi Dave,

I once fixed a 5086-7812? second converter with a 5021-8661 board.
The only problem on this, was cracked solder joints on the feed through capacitors on the board. So I did not have to open the cavity part of the converter.
HP had cut the legs after soldering, all the way down in the solder joint. This is a bad thing as it adds stress to the solder. I was sure HP would have known better.
I have pictures of it, but not at hand right now.

Do you have a second spectrum analyzer? You should check the output of the test port on the converter.
And also the input level of the LO and IF.

Maybe you can tell us a bit more about the fault. What is the loss through the converter?
Guess this SA only go to 2.9GHz? so there is no high band?
What test equipment do you have to test and fault find with.

Regards,
Askild



On Tue, Feb 8, 2022 at 6:20 AM Dave Ireland <mirrors@...> wrote:
Sorry I rushed that last email.

For more relevance the second converter I am talking about is a 5086-7957 and it is low on gain.

Dave

On 8/02/2022 1:10 pm, Dave Ireland wrote:
Has anyone had any joy repairing on of these.

Dave



Re: Cascaded amplifier for 8673D Watkins Johnson 6203-044 (HP 0955-0215 )

 

¿ªÔÆÌåÓý

?

Thank you very much for this information

?

-Yves

?

De?: [email protected] <[email protected]> De la part de bigpapak507@...
·¡²Ô±¹´Ç²â¨¦?: 10 f¨¦vrier 2022 00:37
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] Cascaded amplifier for 8673D Watkins Johnson 6203-044 (HP 0955-0215 )

?
Re: ESG-DP E4437B Signal Generation Issue

 

You are on the right track. The 1GC1-4210 chips tend to deteriorate over time causing the failure mode you described. Your other option is to find a 60019 board and replace it.?
Re: HP 8648C keyboard mostly dead

 

https://www.amazon.com/Circuit-Non-Toxic-Conductive-Electronic-Keyboard/dp/B08T9MKSG5/ref=sr_1_10?keywords=conductive+ink+pen&qid=1644472651&sr=8-10
Re: Cascaded amplifier for 8673D Watkins Johnson 6203-044 (HP 0955-0215 )

 

Re: HP detector

 

OK - then ther should be no DC "roll off"

Cheers!

Bruce

Quoting Dave Wright <davewrightsplace@...>:

The 8471A is DC coupled.
The input termination resistor is connected between the diode anode and case.
The output capacitor is connected between the diode cathode and the case.

_Dave
Re: HP detector

 

The 8471A is DC coupled.
The input termination resistor is connected between the diode anode and case.
The output capacitor is connected between the diode cathode and the case.


_Dave
Re: My Agilent MSOX2024A hangs at boot. Will Keysight still repair it at no charge?

 

Here's the response I got from Keysight today:

---------------------------------------------------------------------------------------------------------------------------------------------------------

?

If the oscilloscope has any of the following symptoms, it may qualify for a free repair under our internal Service Note DSOX2014A-06B:

  • It powers up but the screen remains blank and the keyboard LEDs begin to flash in sequence
  • Its splash screen is displayed with cycling keyboard LEDs
  • It continually reboots
  • The boot halts with any combination of the Serial, Digital, Math or Ref LEDs remaining lit

In this case, you can contact our service center at the following number and request an evaluation for the free repair:

800-829-4444 (Press 3, then 1)

If/when you call, please be sure to mention the Service Note and be as detailed as possible about the behavior you¡¯re seeing.? If your description does not match one of the four failure modes listed above, you will be charged for the evaluation.? The evaluation fee would only be refunded if our repair technician confirms the failure is covered under the service note.

Before sending the unit in, you may want to try solving the problem on your own.? This would require updating the firmware, which is only possible if you can get the unit to boot properly one time.? I would recommend making at least 10 or 20 attempts (i.e., power cycles), although some users have reported success after as many as 100 attempts.? If it boots normally just once, you should immediately install the latest 2.65 firmware before turning it off.? You¡¯ll find the download and installation instructions for the update here:

The new firmware would permanently solve the problem, and the unit would not need repair.

---------------------------------------------------------------------------------------------------------------------------------------------------------

Looks like there's an internal service note that addresses this very issue. I know my scope meets the criteria of the service note. We'll see what Keysight has to say about qualifying for a free repair. As soon as I get an RMA number I'll be sending it in.

Thanks to all who responded, and I'll keep the group posted on my progress!

Stan
Re: 54717A Calibrator

 

Can you post pictures from the bottom also ? Would be also nice if you would take out this board, and make photos with different angles, it's a lot of reflections there.?

Best Regards
Arkadiusz

W ?roda, 9 lutego 2022, 21:04:19 CET, <boddax@...> napisa?(-a):


here the pics..
Re: 54717A Calibrator

 

It has eeprom, it's the hn58c65.

W ?roda, 9 lutego 2022, 21:04:19 CET, <boddax@...> napisa?(-a):


here the pics..
Re: 54717A Calibrator

 

No i dont have disk ..ill post pics soon , maybe yes i dont know much about 54712A
Re: 54717A Calibrator

 

here the pics..
29221 - 29240 of 151362