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.
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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
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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
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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
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So I'm not 100% understanding how the 54112D allows you to use non-preferred steps when defining the time base
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Is anyone able to cast some light or point me in the direction of relevant documentation?
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Peter
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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
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Re: BNC that does not have the bayonet lugs
Paul,
I have an old BWD 880 PowerScope oscilloscope (was manufactured in Australia) that is used for AC mains diagnostics that uses a similar connector except that it does not have the locking feature on the connectors. BWD calls them ¡°Special snap-fit shrouded high voltage¡± connectors.
The connectors are basically lug-less BNCs and the mating probe connectors are simply are pushed over the BNCs. They are recessed in insulators in the panel. If you are curious I could send a photo. I have one replacement connector assembly for this unit and have been looking for a few more.
BWD PowerScope pamphlet:
Greg
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Re: BNC that does not have the bayonet lugs
Hi the connecter I am after is the same form and size as the BNC and TNC? but it has no screw thread or Banet lugs? it has a snap connecter action with a recess grove where the BNC lugs would be ? Regards Paul ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Lynn C via groups.io
Sent: 20 May 2025 23:23
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs ? The internals of BNC and TNC connectors are the same, but TNC connectors have a threaded locking mechanism. I have never seen any connector with BNC/TNC internals and just a locking groove (instead of the bayonet lugs on BNCs, and threads on TNCs). SHV and MHV connectors have locking lugs like BNCs. ? 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
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Re: BNC that does not have the bayonet lugs
The internals of BNC and TNC connectors are the same, but TNC connectors have a threaded locking mechanism.
I have never seen any connector with BNC/TNC internals and just a locking groove (instead of the bayonet lugs on BNCs, and threads on TNCs).
SHV and MHV connectors have locking lugs like BNCs.
Lynn C. KA7FPH
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
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Re: BNC that does not have the bayonet lugs
Hi Mike Thy can look like? the standard SHV but that has bayonet lugs on ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Mike via groups.io
Sent: 20 May 2025 22:39
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] BNC that does not have the bayonet lugs? SHV? ? 73, Mike, Mike Stevens, G8CUL/F4VRB. ? ? 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
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Re: BNC that does not have the bayonet lugs
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Re: BNC that does not have the bayonet lugs
SHVs have bayonet lugs.
-Dave
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On 5/20/25 17:39, 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
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Dave McGuire, AK4HZ
New Kensington, PA
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Re: BNC that does not have the bayonet lugs
SHV? ? 73, Mike, Mike Stevens, G8CUL/F4VRB. ?
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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
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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
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Re: HP 478A Thermistor Sensor. Input return loss and matching
On Mon, May 19, 2025 at 11:54 PM, Jim Ford wrote:
Yes, 1206 is rather large. ?I¡¯ve not opened up the 478A or the other thermistor sensor I have for use with the 432A, one goes to 10GHz and the other to 18 GHz, but I would check into smaller resistors. ?0805, 0603, 0402, 0201, and the near-microscopic 01005 are common. ?I think they even go smaller than 01005. ?Conventional wisdom says smaller ones have lower parasitics. ?Good luck. ?HTH.
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I think some testing of any alternative capacitors would be required because MLCC type caps often have subtle package resonances and they can also develop transmission line type properties when mounted near a ground surface and this can affect the frequency response in subtle ways. In this respect, some high performance COG/NP0 caps are totally unsuitable for wideband use. The classic ATC 100 and 800 range of high Q caps is a good example of a NP0 capacitor type that should be avoided if the aim is to achieve a very flat frequency response across a very wide frequency range. These caps have various package resonances that cause subtle (and very narrow) resonance dips in their frequency response. Often these ATC caps can suffer with several little resonances across VHF and UHF. So these caps would be unsuitable for use in a power meter although I don't think they offer high values in NP0 anyway. The same mini resonance risk applies across all high Q C0G/NP0 MLCC caps although I find that the lower cost ones (with lower Q) tend to give a smoother response but at the expense of higher ESR. Sometimes, mounting the cap on its side can remove a subtle resonance.
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The main risk with selecting really small class 2 (eg X7R) caps is that the capacitance can become very dependent on the applied DC voltage and it also becomes highly temperature dependent. So I don't see the selection of alternative caps as being an easy task. 1206 would probably be OK if they can be made to fit but I'd recommend a very thorough sweep test in very small frequency increments to make sure there aren't any little resonant dips anywhere. These dips can be quite shallow at maybe 0.05dB to 0.3dB and they can be very narrow at maybe 5 MHz wide. It's usually C0G/NP0 caps that suffer in this respect though.
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Regards
Jeremy
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Re: HP 334A distortion analyser problem
Not specific to this device - but check power rails.? Failed capacitors or deteriorated gain transistors in the power supply will cause more noise on the power rail - could be a simple fix . I would start with a PS inspection.? Connect your scope to the rails and look at the signal.? You can look at it with AC mode if the scope cannot provide enough?offset.? ?The ideal?result is a flat line? -? but most likely you will see some 100/120Hz ripple (depending on country) .? If the ripple is going to the filtered DC power rails that can get into the measured signal chain.?? The cold spray might suggest there are failing transistors or diodes but could?also be carbon composition resistors if present.? These? carbon comp. resistors should almost always be replaced with metal film resistors as they don't age well.? Another?reason for hot cold issues is cracked solder joints.? No other way to identify but to? look at the solder joints.? Usually? this happens in areas that?heat up.? The thermal cycling causes the solder to crack.? Take some pictures of the A2 board .?
Also a video here about the unit :?
Maciek?
On Tue, May 20, 2025 at 11:26?AM Goran Parezanovic via <GParezanovic= [email protected]> wrote: I was wondering if someone has the idea about this problem:
In voltmeter mode , just after starting it up, the needle will deflect from zero, for about 5% of the scale ( no input ). This will happen on all the ranges and the deflection is about the same regardless of the range, ( except for two lowest ranges where it gets more than 5 % ). After warming up ( a few minutes ) the needle will go to zero, where it's supposed to be. So I suspected that a warmed up component will go to the good working area. Board A2 has the measuring circuit on itself and transistors Q5 to Q9 form an amplifier that goes to the measuring bridge and then to the meter. I disconnected the input to the measuring circuit and still had the same symptoms, so my conclusion is that the amplifier is inducing the noise. Now comes the puzzling part: 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.?
At the moment I'm looking for advice, the manual reads that the full scale signal is 1 mV ( and has to be measured with 10 Mohm, 10 pF probe ), so for my 5 % deflection the signal would be 50uV, and with my oscilloscope and probes I have I can't trace this level to try to find problem that way ).
Any advice or suggestion greatly appreciated.
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Sorry: maybe I didn't explain myself well: in fact A3A8 is in test mode, as indicated on page 164 of the service manual (Jumper A3A8 TP1 SWP TO A3A9TP3). Anyway I replaced the ACLU module and things have definitely improved: the noise intervals have reappeared and the signal placed at the input is visible again on the CRT. in band "A" things are quite good, while the other bands (2 - 22Ghz) show a signal rather variable in amplitude depending on the frequency.... So the fundamental problem was due to the ACLU module apparently...
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HP 334A distortion analyser problem
I was wondering if someone has the idea about this problem:
In voltmeter mode , just after starting it up, the needle will deflect from zero, for about 5% of the scale ( no input ). This will happen on all the ranges and the deflection is about the same regardless of the range, ( except for two lowest ranges where it gets more than 5 % ). After warming up ( a few minutes ) the needle will go to zero, where it's supposed to be. So I suspected that a warmed up component will go to the good working area. Board A2 has the measuring circuit on itself and transistors Q5 to Q9 form an amplifier that goes to the measuring bridge and then to the meter. I disconnected the input to the measuring circuit and still had the same symptoms, so my conclusion is that the amplifier is inducing the noise. Now comes the puzzling part: 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.?
At the moment I'm looking for advice, the manual reads that the full scale signal is 1 mV ( and has to be measured with 10 Mohm, 10 pF probe ), so for my 5 % deflection the signal would be 50uV, and with my oscilloscope and probes I have I can't trace this level to try to find problem that way ).
Any advice or suggestion greatly appreciated.
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Re: (OT?...) Sticky labels for aluminum and other typical materials panels
Maybe this is the t=right thread to ask if anyone knows of a truly Permanent marker ?
If i write on polythene bags with a Sharpie it rubs off in a few weeks.
A Biro is a little better but too narrow to read easily unless the bag has a white label patch.
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OFF TOPIC - JSR RM3500 automatic modulation meter manual
Date: Mon, 19 May 2025 12:44:52 -03
Does anyone have the manual for the JSR RM3500 automatic modulation meter?
Thank you.
Marcelo F. Ruiz
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Re: (OT?...) Sticky labels for aluminum and other typical materials panels
Custom front panels are a perennial pain, so a lot of people have tried different ways. You may get some useful ideas from this post and the links in that post.
FYI: I haven't tried any of them.
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Looking for manuals for Yokogawa-HP 4255A Universal Bridge
Hi all,
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I am thinking of maybe picking up a 4255A Universal Bridge for some fun, but I can't seem to find a manual for it anywhere.
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Does anyone have a copy of any user or service manuals for this instrument?
I'm happy to buy a paper manual (which I'll scan and upload) or if anyone has a scan they can provide?
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Thanks!
Jared
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Paul Bicknell
Dave McGuire
Marcelo Ruiz
Jared Cabot