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Re: HP 16505a and 16500b/c scsi interface
I had the opposite problem.? I had the disk but not the adapter.? But they pop up often on eBay without the software. I wish there was a 16700 port of that software. Anyway, I'll try to pull it off my 16500 and upload it to the files section this weekend. Marc On Wed, Feb 24, 2016 at 6:41 PM, brunonorth@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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Re: 8555a indicator/cord replacement or modification
One more thing - depending on the microwave counter used, and it's signal kickout, it may add some spurs to the displayed signal. There's not much isolation on the 1LO port. If anything looks suspicious, it can be confirmed by disconnecting the counter.
Ed |
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Re: Spring loaded Old Style Front Panel Buttons
¿ªÔÆÌåÓýHi Chuck, ? Are you saying that you can clean the switches with IPA without taking the keyboard apart or removing it from the instrument? Do you just spray it in along side of the keys? ? I have an HP 3326A with keys that are kind of hard to push. ? Thanks Gary? K4FMX ? From:
hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] ? ? I have
advocated washing the assembled keyboards with > ----- Original Message -----
>> From: "Adrian Nicol fenland787@... [hp_agilent_equipment]" >> To: "hp agilent equipment" >> Sent: Wednesday, February 24, 2016 >> 9:52:43 AM Subject: Re: [hp_agilent_equipment] Spring loaded Old Style Front >> Panel Buttons >> >> Hi Barry, short answer is yes, that is the reason and the fix is dead easy and >> really effective, if my experience is anything to go by. There is a parallel >> thread running where I and others have posted their solutions - I just did a >> 3456A and 3455A as well as an 8566A and other gear - but this is what I did: >> >> Remove the switch PCB from the panel, flood spray the switches with IPA (Isoprop >> alcohol) and operate each a few times, within just three or four operations they >> free up like magic going from clunky 'feels-like-something-is-about-to-bust' to >> almost silky smooth! Then blow it off with an air-gun and give it another dose >> for luck. Works for me anyway! >> >> >> On Wednesday, February 24, 2016 3:09 PM, "Chuck Harris cfharris@... >> [hp_agilent_equipment]" wrote: |
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Re: 8555a indicator/cord replacement or modification
You can measure the first LO YTO frequency - hook up to the LO output on the front panel. It runs from about 2-4 GHz. By keeping track of the 1LO, n - the harmonic used, and the first IF - 2050 or 550 MHz, depending on band, you can figure out the center frequency. The band scales have the info on them.
Ed |
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Hi,
I have had experience with the SimmConn Labs CRT to LCD Replacement kit. I put the 6.5 inch LCD into my HP 8566B. It is an AWESOME DISPLAY. Different Color Schemes, everything is better, weighs less, very good product. They sell an LCD replacement kit for the HP8573A/B too (Newscope-9). Website is below: My only affiliation with SimmConn Labs is that I purchased the LCD Kit. I can tell you that the guy that designs and owns the business communicates well with his customers. I recommend this kit. The install time on their website and instructions is a little optimistic though. Ross Wellington From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] Sent: Wednesday, February 24, 2016 5:42 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays I have both an 8720D and an 8753ES. Both are LCD, but the displays are rather dim. I see a VNA in eBay which was advertised as having a brighter replacement LCD. Does anyone have any experience of these? I know that there are LCD replacements for older VNAs with CRTs, but I am not looking at those. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) [Non-text portions of this message have been removed] |
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Re: HP 16505a and 16500b/c scsi interface
By "source" do you mean the contents of the floppy or the source code that created it? I had the floppy (but I've misplaced it).? However I have the files in a directory on a 16500B hard drive.? I don't remember any tricky installation; I just copied the files over. Marc On Wed, Feb 24, 2016 at 5:57 PM, brunonorth@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
¿ªÔÆÌåÓýI agree.? I have replaced the CFL¡¯s in my 8753E and 8720D, and it was pretty easy.? They¡¯re not very expensive on *Bay either.? I¡¯m also considering doing an LED conversion next time around. ? Daun ? Daun E. Yeagley, II, N8ASB ? From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Wednesday, February 24, 2016 8:50 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays ? ? If the display is dim, there's a good chance the CFL lamps in the display are at EOL. If a new display is not available, there's not a big deal for a handy man to replace the CFL lamps with mechanically similar devices (length x dia). Replacement CFLs for LCD displays are available on EPay and the usual distributors. ? There's a small chance that the up converter used to fire (~1500V) and feed (~800V)?the CFL is defective, same story, most models are available for replacement. ? Even the full display can be replaced with a newer model, but the datasheets need a very careful analysis, both from an electrical and mechanical perspective. ? I did quite a few LCD repairs and replacements in Advantest (R3131, R3753, etc...) and R&S (UPD, UPL, etc...) equipment, it's not that scary it looks at the first glance. ? |
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
If the display is dim, there's a good chance the CFL lamps in the display are at EOL. If a new display is not available, there's not a big deal for a handy man to replace the CFL lamps with mechanically similar devices (length x dia). Replacement CFLs for LCD displays are available on EPay and the usual distributors. There's a small chance that the up converter used to fire (~1500V) and feed (~800V)?the CFL is defective, same story, most models are available for replacement. Even the full display can be replaced with a newer model, but the datasheets need a very careful analysis, both from an electrical and mechanical perspective. I did quite a few LCD repairs and replacements in Advantest (R3131, R3753, etc...) and R&S (UPD, UPL, etc...) equipment, it's not that scary it looks at the first glance. |
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Re: HP 8901A assistance needed.
Joe, interesting, the reason I found this problem was that I was implementing a more modern version of AN 286-2:? The 61.0 function resets the listen flip-flop and returns the state of the adressed to talk, and adressed to listen flip-flops.? 61.2 does the same for the ATN and REN lines.? My main consern was that the manual was wrong on how it should be returned on a idle instrument.? The 8901A GPIB connection does not respond when addressed. The instrument does understand most of the commands that don't require lock out, like a serial poll, but does not respond at all.? When addressed, the instrument does not show any sign of being addressed.? I tested the bus transceivers first, and they are fine, ?after this, I have worked my way through address decoder, listen and talk flip-flops and are running out of options.? The version I have has a masked ROM, and those should not go bad the same way EPROMs do.? BR. Thomas.
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?Please? avoid sending? me? Word? or? PowerPoint? attachments. ?See? <> PDF is an better alternative and there are always LaTeX! |
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Dear Dr. David: The original LCD for 8753E are SHARP LQ9D340H , it is still available somewhere ? Regard Tony Cheung FEB 25 2016 From: "'Dr. David Kirkby (Kirkby Microwave Ltd)' drkirkby@... [hp_agilent_equipment]" To: hp_agilent_equipment@... Sent: Thursday, February 25, 2016 8:41 AM Subject: [hp_agilent_equipment] BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
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I have both an 8720D and an 8753ES. Both are LCD, but the displays are rather dim. I see a VNA in eBay which was advertised as having a brighter replacement LCD. Does anyone have any experience of these?
I know that there are LCD replacements for older VNAs with CRTs, but I am not looking at those.
Dr David Kirkby
Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) |
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Re: [TekScopes] Re: Why is Mu Metal used?
Geoff
Mu metal performance is similar to that of ferrites on higher frequencies and powdered iron above that into the VHF region. They all contain the field due to the magnetic properties of the material used.
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It is primarily a nickel iron alloy altho several versions exist using small amounts of other metals and up to a 80% nickel content Carl ----- Original Message -----
From: 'cheater00 .' cheater00@... [hp_agilent_equipment] To: hp_agilent_equipment@... Sent: Saturday, February 20, 2016 2:08 PM Subject: Re: [hp_agilent_equipment] Re: [TekScopes] Re: Why is Mu Metal used? I know they're different Jack, I'm asking how. Cheers On Sat, Feb 20, 2016 at 8:06 PM, Jack Mcmullen forjack842@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote: You're comparing apples and oranges. 60hz Magnetic fields are what MU-metal are best at filtering out. Copper screen is best for shielding RF electric fields as radiated from antennae. Jack KG6INX -----Original Message----- From: 'cheater00 .' cheater00@... [hp_agilent_equipment] <hp_agilent_equipment@...> To: TekScopes <TekScopes@...>; hp_agilent_equipment <hp_agilent_equipment@...> Sent: Sat, Feb 20, 2016 11:02 am Subject: [hp_agilent_equipment] Re: [TekScopes] Re: Why is Mu Metal used? I understand a changing magnetic field would induce a current in the copper foil, and so the magnetic field would effectively be "used up" by the copper foil, though. Why is copper shielding not effective against 60 Hz? That's not DC after all. Thanks a lot I'm only learning about EM theory On Sat, Feb 20, 2016 at 7:57 PM, snapdiode@... [TekScopes] <TekScopes@...> wrote: grounded copper foil would do precisely zero against a dc field No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.6189 / Virus Database: 4533/11666 - Release Date: 02/20/16 |
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Re: HP 8901A assistance needed.
Thomas, Yes, the GPIB is fully functional on my 8902A. I use?it for testing of various signal generators, including the 8642B. This specific generator has built-in GPIB intelligence for?controlling?the?verification tests?along with?the 8902A and a GPIB line printer. I have also developed some Visual Basic programs to?test the 8901A/B and 8902A using GPIB with the other instruments in my lab. I did not lookup the 61.0 / 61.2 SPCL commands, so I am not sure what these commands are telling you. I guess I should look it up now. What type of problems are you finding on your 8901A? Regards, Joe, KN5U |
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BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Dr. David Kirkby (Kirkby Microwave Ltd)
I have both an 8720D and an 8753ES. Both are LCD, but the displays are rather dim. I see a VNA in eBay which was advertised as having a brighter replacement LCD. Does anyone have any experience of these? I know that there are LCD replacements for older VNAs with CRTs, but I am not looking at those. Dr David Kirkby |
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Re: Spring loaded Old Style Front Panel Buttons
I have advocated washing the assembled keyboards with
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91 or 99% IPA before on this board. It changes the character of the keys from something that feels like you are going to do damage, to something that feels nice. I think that HP put the grease on the springs to modify the feel.... perhaps preferring a strong click? The grease will stick the spring to the plunger until it abruptly gives way, and the key pushed down. I think it was a bad idea given the adverse long term effects of dried grease. I have left all of my keyboards dry, and they seem perfect. -Chuck Harris Barry n4buq@... [hp_agilent_equipment] wrote: Hi Adrian, |
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Re: HP 8901A assistance needed.
This is most interesting, thank you for the help! 2 of 3 instruments does not respond according to the manual. John and Joe, have you tried your instruments with GPIB?? I suppose there could be a error mode in the instruments where the GPIB adressing stops working.? BR. Thomas. 2016-02-24 23:34 GMT+01:00 John Kernkamp wb4yjt@... [hp_agilent_equipment] <hp_agilent_equipment@...>:
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?Please? avoid sending? me? Word? or? PowerPoint? attachments. ?See? <> PDF is an better alternative and there are always LaTeX! |
Yiu On Tony C