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Re: HP 334A distortion analyser problem

 

On Tue, May 20, 2025 at 10:25 AM, Goran Parezanovic wrote:
I applied "supper cold" spray ( -20 deg)to each transistor in the measuring circuit ( Q5 to Q9) but the voltmeter works fine, stays at zero.?
?
I think it's more likely that the problem is one or more electrolytic capacitors which often tend to be "leaky" when they are first charged up. This will go away after a bit of time.? If the required warmup time is short enough for you to tolerate it, just leave it as is. If it's long enough to be annoying, you can try walking thru the circuit, grounding things that won't mind being grounded, until you get to the point where the problem no longer occurs.
?
If you ground a point and find that the meter now stays at zero even when cold, you know that the problem is not after the stage you grounded, but it might be IN the stage you just grounded.
?
If the circuit path is long, the best way to do this is a binary search, where you start in the middle, dividing it in half, then proceed into quarters, etc. Eventually you'll narrow it down to one section of the circuit, where you'll have to decide which element is the problem.
?
--
Jim Adney
Madison, WI USA
Re: HP 334A distortion analyser problem

 

In message <[email protected]>, Goran Parezanovic via
groups.io <GParezanovic@...> writes
Thank you for the input, you gave me new perspective. I was focused
on the metering circuit, and when I applied freeze spray to the
transistors in power supply, I found the culprit on second
transistor I tried. Confirmed twice, now to find the replacement !

_._,_._,_

Result then!, but do make sure you change the capacities in the power
supply especially the main smoothing ones. I did this with my 339A and
the figures for distortion residuals improved quite a bit, ripple on the
supply rails..

--
Tony Sayer
Re: HP 8566B repair

 

I tried to start the automatic calibration routine (Shift W): the photos show the results obtained... I don't understand what "Recall: reg 7" means.
..
Re: HP 334A distortion analyser problem

 

Thank you for the input, you gave me new perspective. I was focused on the metering circuit, and when I applied freeze spray to the transistors in power supply, I found the culprit on second transistor I tried. Confirmed twice, now to find the replacement !
Re: how to convert HP83711B to 83712B!

 

Hi folks,
?
I have uploaded my 837xx EEPROM manipulation software.
I have also uploaded a ducument how I did an amplitude calibration of my HP83732A.
Both can be found here:
?
Tom
Re: BNC that does not have the bayonet lugs

 

Condor mobile 2-way VHF/UHF radios had those "no lock" connectors in panel mount versions. Used in car mounts, the radio was on slide rails allowing easy removal/installation.

In the Netherlands commonly found on ham flea markets.

Wilko
Re: BNC that does not have the bayonet lugs

 

Paul,
?
Do you have a photo of the connectors you are looking for ?
?
Rgds
Eric
Re: BNC that does not have the bayonet lugs

 

How about a Push-On BNC connector

On Wed, May 21, 2025, 5:31?PM Paul Bicknell via <admin=[email protected]> wrote:
Hi Dave thank you I have both the? SHV and the MHV? connecters that are the size of the BNC connecters? but they all have the Bayonet lugs on them

The connecters I want are the size of the above but without the Bayonet lugs and connect together as a push fit without twisting and to release you pull the outer ring back

Regards Paul



-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave McGuire via
Sent: 21 May 2025 01:59
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs


? ?There's another one, called "SHV".? It's common in the world of lasers and particle physics.

? ? ? ? ? ? ? ? -Dave

On 5/20/25 20:36, Bill Carver wrote:
> High voltage BNC = "MHV" connector. I used it in RG8 for 3.5
> KV-and-ground? to tube amplifier.
> W7AAZ
>
>
> On 5/20/2025 3:39 PM, Mike via wrote:
>> SHV?
>>
>>
>> 73, Mike,
>>
>> Mike Stevens,
>>
>> G8CUL/F4VRB.
>>
>>
>> From: [email protected]
>> <[email protected]> On Behalf Of Paul Bicknell
>> via
>> Sent: 20 May 2025 22:05
>> To: [email protected]
>> Subject: [HP-Agilent-Keysight-equipment] BNC that does not have the
>> bayonet lugs
>>
>>
>> Hi all a bit off base? but has anyone ever come across a connector
>> that is the same size and form as a BNC but it does not have the
>> bayonet lugs and uses a locking grove where the lugs would be? it is
>> Made by Radial? and there is even a High voltage version with more
>> insulation like the high voltage BNC? as I would like to get hold of
>> a few mating sets
>>
>> Regards Paul? located in the? UK
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>


--
Dave McGuire, AK4HZ
New Kensington, PA
Re: BNC that does not have the bayonet lugs

 

¿ªÔÆÌåÓý

Hi john

?

Yes that is possibly ok for the sockets as some BNC connecters do have a grove by the lugs? but it is getting the mating connecters to go on the cable that is the problem

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of John Pease via groups.io
Sent: 21 May 2025 01:15
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs

?

I have the same problem, but I do not need to design for manufacturing. The dremel tool made short work of the lugs/nubs.
Re: BNC that does not have the bayonet lugs

 

Hi Dave thank you I have both the SHV and the MHV connecters that are the size of the BNC connecters but they all have the Bayonet lugs on them

The connecters I want are the size of the above but without the Bayonet lugs and connect together as a push fit without twisting and to release you pull the outer ring back

Regards Paul

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave McGuire via groups.io
Sent: 21 May 2025 01:59
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs


There's another one, called "SHV". It's common in the world of lasers and particle physics.

-Dave

On 5/20/25 20:36, Bill Carver wrote:
High voltage BNC = "MHV" connector. I used it in RG8 for 3.5
KV-and-ground to tube amplifier.
W7AAZ


On 5/20/2025 3:39 PM, Mike via groups.io wrote:
SHV?


73, Mike,

Mike Stevens,

G8CUL/F4VRB.


From: [email protected]
<[email protected]> On Behalf Of Paul Bicknell
via groups.io
Sent: 20 May 2025 22:05
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] BNC that does not have the
bayonet lugs


Hi all a bit off base but has anyone ever come across a connector
that is the same size and form as a BNC but it does not have the
bayonet lugs and uses a locking grove where the lugs would be it is
Made by Radial and there is even a High voltage version with more
insulation like the high voltage BNC as I would like to get hold of
a few mating sets

Regards Paul located in the UK












--
Dave McGuire, AK4HZ
New Kensington, PA
Two ex MOD HP 3561A DSA's for sale in the UK.

 

¿ªÔÆÌåÓý

Hi.

In case anyone is looking for a parts unit, or project, there are two HP3561A DSA's up for grabs on the UK auction site:-

??? ?? (Scroll down.)

One with handle, one without.? Both look a bit sorry for themselves, but seem complete (from the outside photo's) if scruffy.

Current starting bids are ?50 (no handle) and ?100 (with handle) UKP.

NO AFFILIATION, just for info.

Should anyone wish to take a punt at one or both, make sure you read the T's & C's before committing yourself!? (Fee's and taxes etc.)

Regards.

Dave 'KBV.? (Who has no spare room for such things!)
Re: BNC that does not have the bayonet lugs

 

TNC thread on types perhaps? Same form factor as a BNC except for the thread on feature.

Don Bitters
Re: HP 8566B repair

 

The ACLU¡¯s have been known to fail for various reasons, I have replaced 4 or 5 of them in the past. It may be possible to repair it if you have the skill set to repair microcircuits. If not there are a few guys on the forum that do.
One of the failure modes was if you rotated the ACLU module 90* and it clunked - the internal circuitry bond to the case has failed and it is loose inside and the bond wire to the case connectors are probably broken.
I suspect very strongly that you will now have to do the full frequency tune and frequency response adjustments, an involved procedure.

Don Bitters
Re: BNC that does not have the bayonet lugs

 

¿ªÔÆÌåÓý

When contemplating use of such connectors for high voltage and high current ¡­ meaning more than microamps for a PM tube, think long and hard about whether you have a guarantee that ground will make before the high voltage, as well as any connectors that might potentially mate with either modified or unmodified connectors and whether the other end of the connector poses a similar hazard for any residual stored charge.



From: [email protected] <[email protected]> on behalf of John Pease via groups.io <john_pease123@...>
Sent: Tuesday, May 20, 2025 7:14:39 PM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs
?
I have the same problem, but I do not need to design for manufacturing. The dremel tool made short work of the lugs/nubs.
Re: HP8757A Display Problem (Scalar Network Analyzer)

 

Success! (Well, 96% success, I still must do the final adjustments over again after this nights(!) work, it is 04:28 in the morning as I type this!)...
?
On circuit board A1 there is a pre-set pot A1-R70 which sets the writing speed - and while checking other waveforms with the 'scope probe and also checking some of the voltages around R70 - R73 I noticed that the test waveform (Pikes peak) would suddenly judder - tapping that corner of the board near those components did the same - so I decided to take out that board and examine it again.
?
Looking at it, the solder joints for the R70 pot and R72 (274R) and R73 (56.2K) they looked 'dry'. ON cleaning all the joints for resistors R70 - R73 them to re-solder them, the wire from R71 (75K) became loose and dropped from the hole! On the other side, it had detached from the resistor body.
?
Since the pre-set pot R70 went from -15V to +15V, the centre voltage being divided by R71 and R72, the actual voltage fed to the writing I.C. to set the writing speed does not need to be so accurately divided so I was able to replace all 3 resistors with E12 values with 2% tolerances which I have plenty of in stock - so I used 47K for R71, 270R for R72 and 56K for R73 after taking out all 3 resistors and cleaning the solder side of the board for the new resistors.
?
Re-setting the board in place and powering up the unit (display now back in the instrument) I used the front panel keys to call up the test pattern, and I was able to adjust R70 to obtain the 7 'dashes' in the set of lines at the lower right corner of the display (as the service manual calls for) - I had to re-adjust the main intensity and background intensity settings for the "bright" and "normal" levels which are of course controlled by the vector writing timing - but I had a working display unit and it also presented the instrument waveforms as expected except for some of the astigmatism and focus issues - these I will deal with tomorrow (today!) morning later on.
?
Looking back on it all, many of the observations and measurements I made must have been clearly affected by the intermittent voltages created by these resistors and their soldered joints due to vibration and the odd knock as I moved the unit around while working on it.
?
I will post a final note when I have completely finished with the final adjustments and closed up the instrument.
?
Thank you again for all of the hints and tips, and to Philip, thanks a great deal for taking all the time to help me with this problem.
?
?
Re: BNC that does not have the bayonet lugs

 

There's another one, called "SHV". It's common in the world of lasers and particle physics.

-Dave

On 5/20/25 20:36, Bill Carver wrote:
High voltage BNC = "MHV" connector. I used it in RG8 for 3.5 KV-and-ground? to tube amplifier.
W7AAZ
On 5/20/2025 3:39 PM, Mike via groups.io wrote:
SHV?


73, Mike,

Mike Stevens,

G8CUL/F4VRB.


From: [email protected] <[email protected]> On Behalf Of Paul Bicknell via groups.io
Sent: 20 May 2025 22:05
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs


Hi all a bit off base? but has anyone ever come across a connector that is the same size and form as a BNC but it does not have the bayonet lugs and uses a locking grove where the lugs would be? it is Made by Radial? and there is even a High voltage version with more insulation like the high voltage BNC? as I would like to get hold of a few mating sets

Regards Paul? located in the? UK








--
Dave McGuire, AK4HZ
New Kensington, PA
Re: BNC that does not have the bayonet lugs

 

High voltage BNC = "MHV" connector. I used it in RG8 for 3.5 KV-and-ground? to tube amplifier.
W7AAZ

On 5/20/2025 3:39 PM, Mike via groups.io wrote:
SHV?


73, Mike,

Mike Stevens,

G8CUL/F4VRB.


From: [email protected] <[email protected]> On Behalf Of Paul Bicknell via groups.io
Sent: 20 May 2025 22:05
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs


Hi all a bit off base but has anyone ever come across a connector that is the same size and form as a BNC but it does not have the bayonet lugs and uses a locking grove where the lugs would be it is Made by Radial and there is even a High voltage version with more insulation like the high voltage BNC as I would like to get hold of a few mating sets

Regards Paul located in the UK
Re: BNC that does not have the bayonet lugs

 

I have the same problem, but I do not need to design for manufacturing. The dremel tool made short work of the lugs/nubs.
Understanding HP 54112D time base operation

 

The range setting in the 54112D allows you to specify the width of the main time display.? ?
From the documentation it looks as though it is possible to use any value for the graph width e.g. 60.5mS
Other parts of the manual indicate that the display width is fixed at 500 points
?
For both of these to be true, the scope software may either be resampling the data before it is displayed or dynamically changing the ADC sampling rate
?
Slightly newer HP scopes, like the 54504A, force the user to use a 1,2,5 sequence i.e. if you request a 60mS time graph width the scope will automatically round to the preferred value of 50mS.?
This seems to make more sense as each time width corresponds to a sample rate that could be derived by simple clock division
?
So I'm not 100% understanding how the 54112D allows you to use non-preferred steps when defining the time base
?
Is anyone able to cast some light or point me in the direction of relevant documentation?
?
Peter
Re: BNC that does not have the bayonet lugs

 

Paul
I know you say it's Radial but it sounds similar to the Lemo unipole connectors with their push-pull locking system, perhaps Radial make a similar range.
Might help
John
MW1FGQ
101 - 120 of 151554