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Re: HP 54542C Scope

 

Have you checked the power supplies and ripple?

On 2016-Feb-06 1:55 AM, michael.rosanbalm@... [hp_agilent_equipment] wrote:

Greetings,

I recently found an 54542C and the previous owner stated it was stuck in diagnostic mode or had boot issues. I placed it on the bench and it fired up right away. I'm not sure how competent he was in this model so I can't be sure there was an actual issue with booting. However upon closer examination there is an issue, not with booting but with the display. Everything seems fine except stability of the trace, when I feed a sine wave in, at any frequency, it just isn't stable. I'm not sure how else to describe it, but slightly jittery. This instability shows up in measurements of frequency, and voltages also which makes it pretty much unusable. It's not a huge jitter but enough to throw off measurements. I'm thinking it might be in triggering rather then a vertical issue but not sure. I could up load a video if anyone has questions or ideas. I would sure like anyone's thinking on this~!~

Thanks in advance,

~Michael - AF7U
HP 54542C Scope

 

Greetings,?

I recently found an 54542C and the previous owner stated it was stuck in diagnostic mode or had boot issues. ?I placed it on the bench and it fired up right away. ?I'm not sure how competent he was in this model so I can't be sure there was an actual issue with booting. ?However upon closer examination there is an issue, not with booting but with the display. ?Everything seems fine except stability of the trace, when I feed a sine wave in, at any frequency, it just isn't stable. ?I'm not sure how else to describe it, but slightly jittery. ?This instability shows up in measurements of frequency, and voltages also which makes it pretty much unusable. ?It's not a huge jitter but enough to throw off measurements. I'm thinking it might be in triggering rather then a vertical issue but not sure. ?I could up load a video if anyone has questions or ideas. ?I would sure like anyone's thinking on this~!~


Thanks in advance,

~Michael - AF7U
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New file uploaded to hp_agilent_equipment

[email protected]
 

Hello,


This email message is a notification to let you know that
a file has been uploaded to the Files area of the hp_agilent_equipment
group.


File : /HP859X Calibration Constants/HP859X_Correction_Constants.xls
Uploaded by : sreaves22655 <sam.reaves@...>
Description : An Excel file for recording the calibration constants before you change the battery!


You can access this file at the URL:



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Re: HP 8593E attenuator repair...

 

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Hello,

Friday, February 5, 2016, 5:21:07, pianovt at yahoo dot com wrote:


 ?
Yes, there is a very good chance that it is the same pad, but I can't guarantee it. At one time, the 4 GHz attenuators were the same as the higher frequency models except that they were not tested above 4 GHz. Some 4GHz attenuators may have been 22 GHz units that didn't perform quite as well above 4 GHz, so they ended up as 4 GHz units.
__



Purchased that 33321-60045, opened it up... And found three pads, one is looking exactly the same as blown 10 dB pad in 33321-60039 from 8593E, another one is like three remaining 20 dB pads in 8593E attenuator, and one wide pad, probably 40 dB one.

10 dB pad was carefully moved to 8593E attenuator, and instrument passed self-calibration without any errors. Not yet tested it at a frequencies over 1.5 GHz, but at least to 1,5 GHz everyting is within specs.


--
Best regards,
Yuri ? ? ? ? ? ? ? ? ? ? ? ? ?mailto:yuri@...
Re: 3325A/B vs 3324A

 

The 3325 is much more capable than the 3324. I can't think of any advantage that the 3324 has over the 3325 other than it looks more modern.. Originally the advanage was lower purchase cost.

Robert G8RPI.
Re: HP 8563E spectrum analyser help needed

 

Hello Chris,

I am having 8563E with only the vertical line on display. I suspect it to be the X-POS video circuitry after the Line generator DACs, however I am unable to troubleshoot further.?

Could you be able to share the A2 controller schematic?

kailashkhairnar@...
kailashkhairnar@...

Regards,
Kailash Khairnar
Re: HP8593A Power Supply repair

 

Hi all,

Update:

Symptom: No display in HP8593A with low supply rail (+5V) after initial power up. I tested the power supply on bench with 2.5A load on +5V, 0.8A each on +/- 15V. The power supply was up and running fine. Short Pin 19 with 17 to bring on PS. There was no fault in any of the electrolytics.

So prepared Power supply extension cable (1 mtr length) ?for the 37 pin D-connector as it was not feasible to test the voltages on pins. And voila!! the spectrum was up and running. I switched it off and on several times to confirm the power supply was not in fault.

The HPWRUP signal from power supply(Pin 37) to Controller board feeds 74HC14 gate and o/p is again inverted by 2-i/p distinct nand gates to obtain LRST and LHLT signals to the processor. When the CPU is halted the current drawn falls below the PS required threshold and hence the PS stops regulating.

1. It was the Power supply unit connector fault and several attempts were made to onstall the P/S but the result was not consistent sometimes the SA would come ON and some times not. There was loose connection in the mating 37-pin D-connectors. The D-connector on the P/S unit mounting was then bent outwards by about 2mm to ensure proper mating, but then that lost flexibility of adjusting the connectors mating. The Connector on the Power supply can move about 3-4mm sideways to ensure the mating on the main board. That was not a problem as once installed there is no need to move the power supply again till it fails.

Line trigger is the signal used by the SA in its trigger function. Thanks for the one who made the circuit schematic available of the board. Thanks Roumen for the schematic of Power supply.

Thanks for your inputs.


Regards,
Kailash Khairnar

On Sun, Jan 31, 2016 at 9:48 AM, AMiTHA <amitha.my@...> wrote:
Hi,

Looking at your problem indicates maybe the filter Capacitor's ESR might be high, try changing the Filter Caps and see if you can bring up the supply back to 5.2V, most logic circuits will work intermittently when the supply drops below 4.8V.

Good Luck?
Amitha?

On Thu, Jan 28, 2016 at 4:09 PM, kailashkhairnar@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
?

Hi Roumen,


I too have a 8593A and there is no display. HPWRUP signal (5V) comes for a second and goes down to zero after Power On. All the supply LEDs are glowing. However the +5.2 V drops to about 4V. I am unable to understand whether this is power supply issue or motherboard issue. What is the function of Line trigger? and is 2.5V on this terminal OK, if you remember.

Please send the schematic on my e-mail id. Thanks for your favour.


Regards,
Kailash Khairnar
India
Re: HP 8593E attenuator repair...

 

Yes, there is a very good chance that it is the same pad, but I can't guarantee it. At one time, the 4 GHz attenuators were the same as the higher frequency models except that they were not tested above 4 GHz. Some 4GHz attenuators may have been 22 GHz units that didn't perform quite as well above 4 GHz, so they ended up as 4 GHz units.

Vladan
Re: OT: Wiltron 360 NWA Disk Needed

 

Adrian,

What's a good way to give you these?
Re: 8665A v4.2.1+ ROMs

 

Thanks Pete, but I already have v4.2.2 for 8664A. I actually posted those in the Files section some time ago.

Cheers!

Colby

On Feb 4, 2016 1:57 PM, "petepdx1955@... [hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:

?

Around April I will be set up again to use my bench.


I have a couple broken 8664's with 4.2.1 and will get out the Data-I/O and one
of them generators copy the ROMs.

But will be around April.

-pete
3325A/B vs 3324A

 

Have a 3325B and deciding if I should spend a time and $'s to fix the 3324A I have or take it to the next Ham swap meet.


One thing the 3324A needs is a new display.


Any thoughts on what a 3324A can do a 3325B can't ?


-pete
Re: 8665A v4.2.1+ ROMs

 

Around April I will be set up again to use my bench.

I have a couple broken 8664's with 4.2.1 and will get out the Data-I/O and one
of them generators copy the ROMs.

But will be around April.

-pete
HP 8593E attenuator repair...

 

Hello,

Does anyone have experience in ordering attenuator pads from Keysight?

If I understand correctly, 10 dB pad for attenuator used in HP 8593E
is p/n 1GT1-3737 and this part is marked as "orderable" in
Find-A-Part. No price there. Maybe someone tried to order this part
last year or so, and know current price?

And, another question... I was able to locate a 4 GHz 70 dB attenuator
unit locally (p/n 33321-60045). Is there a chance that it use the same
pads as 22 GHz unit in 8593E?


--
Sincerely,
Yuri mailto:yuri@...
Re: HP 3582A won't start up

[email protected]
 

Chuck, thanks - that's good stuff.
Re: HP Z3801A Internal Power Supply issues

 

Telco positive grounds came into being because they discovered early on that they were experiencing electrolysis issues with their outside plant copper wires.? Of course, this standard then propagated through all parts of the telco infrastructure including inside apparatus (PBX systems, etc) forever.

A brief description can be found at .

Greg

>On Tue Feb?2,?2016 5:19?am (PST)

, Mark wrote

>Must have been originally designed by the Prince of Darkness - Lucas
>Electric. Isn't that how English automobiles with positive grounds came
>to be? ;-)

>Mark
Re: 8640B Flashing Display

 

I would take a look at the "Counter Phase Lock Circuits Schematic Diagram" which includes the "Counter Mode" switch.

On 2016-Feb-03 9:20 AM, Barry n4buq@... [hp_agilent_equipment] wrote:
The last time I used it (about 6 months ago), my 8640B was working fine. I turned it on last night and now the counter display flashes constantly. This is regardless of the lock switch position.

Anyone know what this might be indicating? I suppose it's possible the lock switch contacts are stuck regardless of the physical position of the button (haven't checked that) but thought I'd ask if there is some other condition that would cause the display to flash.

The generator appears to be working (e.g. generating a CW and/or modulated signal, etc.) at the displayed (albeit flashing) frequency.

Any thoughts?

Thanks,
Barry - N4BUQ
Re: 8640B Flashing Display

 

Hi Frank,

(I sent the first part of this reply earlier but never saw it come through so including it again.)
I thought about that and checked it last night. Set to EXT, the counter goes to zero (I think I recall it still flashed) and with it set to INT, the counter worked as described.

Good thought, though.

I plan to test the counter's ability to work with an external input as well as check the output of the generator with another counter. That might give me something to go on.


UPDATE:
The counter is flashing regardless of any of the switch settings. Even with external input, it flashes so I suspect something's turning on the flash oscillator incorrectly. Looks like I need to look into the circuit that switches that on. I'm guessing a shorted gate.

Thanks again,
Barry - N4BUQ

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Francesco Messineo francesco.messineo@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
To: "hp_agilent_equipment" <hp_agilent_equipment@...>
Sent: Wednesday, February 3, 2016 8:49:10 AM
Subject: Re: [hp_agilent_equipment] 8640B Flashing Display

Hi Barry

On Wed, Feb 3, 2016 at 3:20 PM, Barry n4buq@...
[hp_agilent_equipment] <hp_agilent_equipment@...> wrote:



The last time I used it (about 6 months ago), my 8640B was working fine. I
turned it on last night and now the counter display flashes constantly.
This is regardless of the lock switch position.

Anyone know what this might be indicating? I suppose it's possible the lock
switch contacts are stuck regardless of the physical position of the
button (haven't checked that) but thought I'd ask if there is some other
condition that would cause the display to flash.

The generator appears to be working (e.g. generating a CW and/or modulated
signal, etc.) at the displayed (albeit flashing) frequency.
Check the int/ext rear switch for the time base.
If I remember correctly, no time base signal can cause that behaviour.
Of course it might be another random fault inside the counter assembly
and that needs some troubleshooting to be identified.

Best regards
Frank IZ8DWF
Re: 8640B Flashing Display

 

Hi Frank,

I thought about that and checked it last night. Set to EXT, the counter goes to zero (I think I recall it still flashed) and with it set to INT, the counter worked as described.

Good thought, though.

I plan to test the counter's ability to work with an external input as well as check the output of the generator with another counter. That might give me something to go on.

Thanks again,
Barry - N4BUQ

----- Original Message -----
From: "Francesco Messineo francesco.messineo@... [hp_agilent_equipment]" <hp_agilent_equipment@...>
To: "hp_agilent_equipment" <hp_agilent_equipment@...>
Sent: Wednesday, February 3, 2016 8:49:10 AM
Subject: Re: [hp_agilent_equipment] 8640B Flashing Display

Hi Barry

On Wed, Feb 3, 2016 at 3:20 PM, Barry n4buq@...
[hp_agilent_equipment] <hp_agilent_equipment@...> wrote:



The last time I used it (about 6 months ago), my 8640B was working fine. I
turned it on last night and now the counter display flashes constantly.
This is regardless of the lock switch position.

Anyone know what this might be indicating? I suppose it's possible the lock
switch contacts are stuck regardless of the physical position of the
button (haven't checked that) but thought I'd ask if there is some other
condition that would cause the display to flash.

The generator appears to be working (e.g. generating a CW and/or modulated
signal, etc.) at the displayed (albeit flashing) frequency.
Check the int/ext rear switch for the time base.
If I remember correctly, no time base signal can cause that behaviour.
Of course it might be another random fault inside the counter assembly
and that needs some troubleshooting to be identified.

Best regards
Frank IZ8DWF
Re: 8640B Flashing Display

 

Hi Barry

On Wed, Feb 3, 2016 at 3:20 PM, Barry n4buq@...
[hp_agilent_equipment] <hp_agilent_equipment@...> wrote:



The last time I used it (about 6 months ago), my 8640B was working fine. I turned it on last night and now the counter display flashes constantly. This is regardless of the lock switch position.

Anyone know what this might be indicating? I suppose it's possible the lock switch contacts are stuck regardless of the physical position of the button (haven't checked that) but thought I'd ask if there is some other condition that would cause the display to flash.

The generator appears to be working (e.g. generating a CW and/or modulated signal, etc.) at the displayed (albeit flashing) frequency.
Check the int/ext rear switch for the time base.
If I remember correctly, no time base signal can cause that behaviour.
Of course it might be another random fault inside the counter assembly
and that needs some troubleshooting to be identified.

Best regards
Frank IZ8DWF
78061 - 78080 of 151433