Re: Bill West keytop puller
On Sun, Apr 12, 2020 at 02:05 PM, Maurice Smulders wrote:
What is the safest way to pull the keytops of a Bill West keyboard? I have a 3325A and 8131A with sticky keys I want to fix...
AT https://www.youtube.com/watch?v=kYV7oWQTfVI From 3:10 to 5:08... Curious Mark pulls the caps off a 3325A Bill West keyboard... and shows cleaning and lubing (with DeoxiT... which I think, DeoxiT is mostly bunkum). There is a shot of the tool he is using (looks like a small nail puller) at exactly 4.03/15:18. Seems a bit brutal... He tore the plunger out of the 7 key's frame! (...you can see that if you watch closely.) If you look in the comments you'll see? Raymond Domp Frank's? recommendations (...same as he has posted in this thread.) Best regards and wishes. Roy
|
Re: GPSDO connected to external ref inputs
Thanks, Bruce and Lou.
I figured as long as the units were powered up everything should be OK.? Just paranoid I guess.
Jim
Sent from my Verizon, Samsung Galaxy smartphone
toggle quoted message
Show quoted text
-------- Original message -------- From: Lou Blasco <vk3alb@...> Date: 4/12/20 9:02 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] GPSDO connected to external ref inputs
Agree with Bruce, Been running my 10 MHz 24x7 into a HP-5342A, HP-8901B and Fluke 6060A/AN for years with no ill effects. Regards Lou VK3ALB
|
Re: GPSDO connected to external ref inputs
Agree with Bruce,
Been running my 10 MHz 24x7 into a HP-5342A, HP-8901B and Fluke 6060A/AN for years with no ill effects.
Regards
Lou
VK3ALB
|
Re: Opens and shorts for 4285A LCR meter owners
Hi David.
?
Where did you get the BNC connectors for your open and short?
Were they taken from test fixtures or can they be purchased separately?
Thanks!
|
Re: GPSDO connected to external ref inputs
I've had a lab" with several 8566s, two 8510c,and (probably) 5 5345As + numerous HP equipment with the distributio amp feeding everything all the time. Don't believe my amp puts out quite 4v (think it is more like 1.5 - 2.0, but I've never had a problem.
Quoting Jim Ford <james.ford@...>:
toggle quoted message
Show quoted text
Hi, everybody.
I keep my (Leo Bodnar) GPS-disciplined oscillator running continuously, and I have its output going to a BG7TBL distribution amp (yes, I could have designed and built my own distribution amp easily, but for <$100, it's not worth the time, since I'm not retired yet) . So far, the only instruments I own that can use the 10 MHz from the GPSDO are an 8566A spectrum analyzer and a 5343A frequency counter. Now the distribution amp puts out 4 Vp-p unterminated and 2 Vp-p = +10 dBm into 50 ohms, and I'm wondering if I should keep the outputs of the distrib amp running continuously into the spec an and freq counter.
Maybe I'm just extra cautious, but ISTR blowing something up early in my career by putting hot signals into something not powered up. I keep the 8566A and 5343A powered up and in Standby mode at all times. Perhaps we have the designers of said HP equipments in the group? Or at least somebody familiar with the innards of one and/or the other piece of gear. Magnificent stuff, BTW!
Thanks.
Jim Ford
|
Re: Are HP3325 A and B version parts interchangeable?
BTW, there are a few possibilities to explain instability of the output amplitude. One of the causes is worn out relays even with the newer Aromat relays. I ended up building a daughterboard using currently available Omron relays to replace the obsolete Aromat brand.
Other causes for instability are bad grounds and lossy coaxial cables downstream of the relays. Bad ribbon cables between the A21/A03/A14 and controller boards is another common cause. This is caused by high resistance contacts within the ribbon cable crimps. I have resorted to building my own replacement ribbon cables because the original cables are no longer manufactured. When replacing a ribbon cable, it is usually necessary to realign the 3325A/B because it is almost always too high on the DC Offset and function pp voltages
Joe
|
WTB: 3467A Printer module.
I have a 3567A Logging Multimeter here that I picked up cheap but it is missing the printer module.
Does anyone have a printer module they are willing to sell and send to Japan?
?
Thanks!
|
Re: Are HP3325 A and B version parts interchangeable?
Hi Ed,
I work on restoring both models and have run into these issue on occasion. The controller board, power supply, and front panel/display are not interchangeable between the A&B models, but the A3, A14, A21, and attenuator boards are interchangeable. Be careful not to use older revision boards in the B model (i.e. A14C, A21D, and A3C should be the only boards used in the B model). Additionally, both 001 and 002 options are interchangeable. Theoretically, the older Ovenaire OCXO used in the A model should work in the B Model, but newer the Nihon Dempa assemblies are more stable and warm up quicker.
IIRC, one of the service notes addresses older versions of A04 / A14 being applied to newer units due to a possibility of catching fire.
Regards,
Joe, KN5U
|
Hi, everybody.
I'm looking for a?85660-20101, the piece of hardline or semi-rigid coax that connects the IF input to the IF output on the front of the synthesizer section of an 8566A spectrum analyzer.? I can't find it on eBay.
My 8566A came with a piece of semi-flexible cable, so it works, but I keep bumping it because it's right about at knee level (I keep that 112 lb monster on the bottom shelf of my bench to keep the center of gravity low).? Sure would be nice to have the real thing!? Anybody have a parts mule that could spare an?85660-20101?
I'm in Southern California, USA.
Thanks.
Jim Ford
|
Re: Opens and shorts for 4285A LCR meter owners
Hello,
do not worry. Just send another gaggle of pics, and we will run
it.
Something else: I have one of these expensive Tyco, or Tymo or
Dymo label printer. But it was never used. If anyone needs labels
printed, let me know...maybe you can motivate me to bring it up. I
would simply ram the labels in an envelope and send it your way.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 04. 13. 3:29, Dr. David
Kirkby, Kirkby Microwave Ltd wrote:
toggle quoted message
Show quoted text
On Mon, 13 Apr 2020 at 02:01, Tam Hanna < tamhan@...>
wrote:
Hello Dave,
giving credit is life blood. I treat my Instagram as a
public rolodex, and hope that someone who needs sh*t you
sell slinks over to your firm.
If he just does it, and does not even email me, I am
even happier. I am not in it for ego...
Tam
I will create some better pictures later with
some printed labels, rather then ones I scribbled with a
pen.?
I have been thinking about how best to make a
fixture able to handle a wide range of lengths of coils ?I
was thinking of use earth blocks like these
?
Preferably not at Farnell prices!
Dave
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3
6DT, United Kingdom
|
GPSDO connected to external ref inputs
Hi, everybody.
I keep my (Leo Bodnar) GPS-disciplined oscillator running continuously, and I have its output going to a?BG7TBL distribution amp (yes, I could have designed and built my own distribution amp easily, but for <$100, it's not worth the time, since I'm not retired yet) .? So far, the only instruments I own that can use the 10 MHz from the GPSDO are an 8566A spectrum analyzer and a 5343A frequency counter.? Now the distribution amp puts out 4 Vp-p unterminated and 2 Vp-p = +10 dBm into 50 ohms, and I'm wondering if I should keep the outputs of the distrib amp running continuously into the spec an and freq counter.
Maybe I'm just extra cautious, but ISTR blowing something up early in my career by putting hot signals into something not powered up.??I keep the 8566A and 5343A powered up and in Standby mode at all times.?Perhaps we have the designers of said HP equipments in the group?? Or at least somebody familiar with the innards of one and/or the other piece of gear.? Magnificent stuff, BTW!
Thanks.
Jim Ford
|
Re: Opens and shorts for 4285A LCR meter owners
On Mon, 13 Apr 2020 at 02:01, Tam Hanna < tamhan@...> wrote:
Hello Dave,
giving credit is life blood. I treat my Instagram as a public
rolodex, and hope that someone who needs sh*t you sell slinks over
to your firm.
If he just does it, and does not even email me, I am even
happier. I am not in it for ego...
Tam I will create some better pictures later with some printed labels, rather then ones I scribbled with a pen.?
I have been thinking about how best to make a fixture able to handle a wide range of lengths of coils ?I was thinking of use earth blocks like these
?
Preferably not at Farnell prices!
Dave -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@...Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
Re: Opens and shorts for 4285A LCR meter owners
Hello Dave,
giving credit is life blood. I treat my Instagram as a public
rolodex, and hope that someone who needs sh*t you sell slinks over
to your firm.
If he just does it, and does not even email me, I am even
happier. I am not in it for ego...
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 04. 13. 2:59, Dr. David
Kirkby, Kirkby Microwave Ltd wrote:
toggle quoted message
Show quoted text
On Mon, 13 Apr 2020 at 01:53, Tam Hanna < tamhan@...>
wrote:
Hello David,
may I have these pictures for my Instagram?
Sure
I would give you full credit of course.
I was going to ask that anyway. But feel free
to use?
Tam
With best regards
Tam HANNA
Dave
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3
6DT, United Kingdom
|
Re: Opens and shorts for 4285A LCR meter owners
On Mon, 13 Apr 2020 at 01:53, Tam Hanna < tamhan@...> wrote:
Hello David,
may I have these pictures for my Instagram? Sure
I would give you full credit of course.
I was going to ask that anyway. But feel free to use? Tam
With best regards
Tam HANNA
Dave -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@...Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
Re: Opens and shorts for 4285A LCR meter owners
Hello David,
may I have these pictures for my Instagram?
I would give you full credit of course.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 04. 13. 2:41, Dr. David
Kirkby, Kirkby Microwave Ltd wrote:
toggle quoted message
Show quoted text
If you own a 30 MHz 4285A LCR meter, you may have
discovered that you should perform a cable compensation if using
1 m or 2 m cables. You need
* Supplied 100 ohm resistor?
* 42090A open
* 42091A short?
The latter are over $1200 each. The 4285A LCR
manual tells you how cobble together the open and short using
BNC adapters if you don’t have the 42090A and 42091A, but I
decided to make them up. Here’s an internal view of the short.
There are two suboptimal things here, but I decided to ignore
them.
1) One should use metal boxes That would short the
braids with a lower inductance, but I had the plastic boxes and
believe that the tags on the BNC connectors which are about 3 mm
wide, are not going to present much inductance.
2) I shorted the inner conductors with a scrap of
FR4 PCB. A bit of wide copper would have been better, but again
I don’t think it will matter. At the maximum frequency (30 MHz),
the wavelength is 10 m.?
The only difference between the open and short is
that the open joins the two pairs of outer BNCs, but doesn’t
short all 4.?
Tomorrow I will make up some proper labels for
these.?
I also a photograph that I made some time ago to
use with a 1 MHz 4284A. It has red and black connectors for the
DUT - there’s no provision for adding DC bias. That seems to
work okay with the 30 MHz 4285A. I intend making another of
these, with 100 mm spacing between the connectors, to handle
larger inductors.?
The LCR meter in the photographs in a 4284A, but
the 4285A looks identical.?
Note, that you don’t need the open and short for
the 4284 - only the 4285A. I don’t know what other LCR meters
these are used with. Keysight discontinued the 4285A, and do not
have a replacement.?
Dave
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3
6DT, United Kingdom
|
Opens and shorts for 4285A LCR meter owners
If you own a 30 MHz 4285A LCR meter, you may have discovered that you should perform a cable compensation if using 1 m or 2 m cables. You need
* Supplied 100 ohm resistor? * 42090A open * 42091A short? The latter are over $1200 each. The 4285A LCR manual tells you how cobble together the open and short using BNC adapters if you don’t have the 42090A and 42091A, but I decided to make them up. Here’s an internal view of the short. There are two suboptimal things here, but I decided to ignore them. 1) One should use metal boxes That would short the braids with a lower inductance, but I had the plastic boxes and believe that the tags on the BNC connectors which are about 3 mm wide, are not going to present much inductance.
2) I shorted the inner conductors with a scrap of FR4 PCB. A bit of wide copper would have been better, but again I don’t think it will matter. At the maximum frequency (30 MHz), the wavelength is 10 m.?
The only difference between the open and short is that the open joins the two pairs of outer BNCs, but doesn’t short all 4.?
Tomorrow I will make up some proper labels for these.?
I also a photograph that I made some time ago to use with a 1 MHz 4284A. It has red and black connectors for the DUT - there’s no provision for adding DC bias. That seems to work okay with the 30 MHz 4285A. I intend making another of these, with 100 mm spacing between the connectors, to handle larger inductors.?
The LCR meter in the photographs in a 4284A, but the 4285A looks identical.?
Note, that you don’t need the open and short for the 4284 - only the 4285A. I don’t know what other LCR meters these are used with. Keysight discontinued the 4285A, and do not have a replacement.?
Dave -- Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@...Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom
|
Hi Rick,
Thanks ! I know this one yet : very interesting indeed. I already
transfer it to my friend.
Best regards,
Fabien, F4CTZ.
Le 13/04/2020 à 01:54, garp6 a écrit?:
toggle quoted message
Show quoted text
hi Fabien,
? ?As well as the previous Web links, look at this repair of the
HP 70004a power supply:
rick
|
hi Fabien,
? ?As well as the previous Web links, look at this repair of the HP 70004a power supply:
rick
|
Everything is located in Downtown Los Angeles, CA.??I am willing to meet people, though we need to maintain social distancing for now.?J??I have the following, all is OBO:
?
Agilent 16702B logic analyzer with 2 cards, and lots of accessories $500.00 plus shipping
?
HP 435A Power Meter.??$50.00 plus shipping
?
HP 478A power sensor with cable.??$150.00??shipped.
?
HP 10811-60160 OCXO.??Includes a board and cable.??$250.00 shipped.
?
HP 53181A keypad board with Display.??$100.00 shipped.
?
I am parting out an HP 8594E.??Let me know what you want/need, and we can discuss pricing, or, make me an offer on the entire thing.
?
Pics https://imgur.com/a/hgUVc0I
|
Re: HP 8920A spectrum analyser amplitude calibration
Hi Colin
I have also seen your posting on the HP8924 group which has additional information in it.
First it is very important to say at what frequencies you are experiencing the errors, the main reason for this is that the front panel on a HP8920A gives the operating range as 400KHz to 1GHz. This is ONLY true for the original electromechanical attenuator version, all the ones that I have seen in the UK have had the PIN diode attenuator fitted which in my experience cannot be trusted below 50MHz. HP claimed 10MHz in their dreams.
Most of these test sets were purchased in the UK for analogue cellular use so the use of a PIN diode attenuator was not an issue.
I would first check to see if the input load measures 50 ohms at the N port, if it does then check and re torque the internal hard line SMA's using a torque spanner, this is very important to avoid damage to the SMA's. There were a number of optimal power handling input loads available, it is not unknown for excess RF power to damage them.
I have not had to work on a 8920A for some years, but as I recall the calibration/adjustment was carried out via the GPIB port using dedicated HP software that would not run on anything later than Windows 95 or possibly 98.
Hope that this helps
George G6HIG On Sunday, 12 April 2020, 22:18:40 BST, Colin Smithers <colin@...> wrote:
Hi all,
I have an 8920A and the spectrum analyser amplitude level is 3dB out. I have read enough to understand that calibrating this is a bit of a secret. Does anyone know it please?
Similarly for calibrating the power meter.
I have asked the same question on the 8924-series group.
Kind regards
Colin Smithers G4CWH
|
Jared Cabot
Dr. David Kirkby, Kirkby Microwave Ltd
