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Re: Agilent 8753ES P? and up arrow on left side of display ?
The up arrow means fast sweep mode P? I found to mean unlevelled power at the start or end of the sweep. Perhaps the power settings are causing it to be out of range at the start or end of the sweep. Considering the noisy trace, the red error message - it looks like it is not locked. Maybe it is just not able to phase lock due to the power being set too low. - is that possible on a good 8753ES with a built in test set? (assuming it is not option 011) Of course it could be a bad YIG too Details here page 44 (1-8) On Mon, 17 Feb 2025 at 13:37, Hank WD5JFR via <kolesnik=[email protected]> wrote:
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Re: IPA type for 3.5mm connector cleaning
There have been a number of recent posts about various alcohols for cleaning.
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I wonder if there has been confusion between ethanol (EtOH) (grain alcohol) and isopropanol.? When distilling? grain mash, the best alcohol concentration you can get is about 70% EtOH and 30% water.? To get 99% EtOH, like Everclear, you have to dry the EtOH / H2O mix with a desiccant like silica gel.? 99% EtOH will avidly absorb water from the atmosphere until it reaches the 70/30 ratio again. If EtOH is sold without a liquor tax stamp, it is denatured with something like Methanol, isopropanol, acetone, or MEK to keep it from being consumed internally. Isopropanol (Often sold as rubbing alcohol) is very definitely toxic, and does not require denaturing. Methanol (wood alcohol) is also toxic, and causes blindness if ingested in a significant quantity.? Methanol comes off the fermented mash in the early stages of distillation, in the "heads", and is supposed to be discarded. Dave On 2/16/2025 6:39 PM, Steve Byan via groups.io wrote:
The 91% isopropyl at my CVS has a bitterant added to it to prevent people from drinking it. It leaves a white residue behind. Since discovering that, I use only 99% isopropyl. Try asking the pharmacist for the 99% variety, some pharmacies stock it. Otherwise you can buy it from electronics distributors such as Mouser and DigiKey. |
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By: Yves Tardif <yves_tardif@...> Description: |
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Re: IPA type for 3.5mm connector cleaning
The 91% isopropyl at my CVS has a bitterant added to it to prevent people from drinking it. It leaves a white residue behind. Since discovering that, I use only 99% isopropyl. Try asking the pharmacist for the 99% variety, some pharmacies stock it. Otherwise you can buy it from electronics distributors such as Mouser and DigiKey. |
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Re: IPA type for 3.5mm connector cleaning
On 2025-02-16 6:09 PM, Dave Daniel via groups.io wrote:
Oh. Like separating sugar from gasoline by adding water, agitating and siphoning off the walter/sugar solution. I hadn't thought of that. Cool. Thanks.I bet there's a story behind that knowledge, maybe one that can only be told with the passing of the years..... Steve Hendrix |
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Re: IPA type for 3.5mm connector cleaning
Oh. Like separating sugar from gasoline by adding water, agitating and siphoning off the walter/sugar solution. I hadn't thought of that. Cool. Thanks. DaveD KC0WJN On Sun, Feb 16, 2025 at 17:56 Roger Henderson via <hendorog=[email protected]> wrote:
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Re: HP 8670B amplifier - does it ring a bell with anyone?
OK, very sorry I still don't have photo(s) to post.
I expect to be where the unit is (a distance away) next weekend, I'll get photo(s) and post those then. In the meantime thanks so much for the comments and discussion, and I'll be sure to come back to this as soon as I have access to the unit for photo(s). Dave |
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Re: IPA type for 3.5mm connector cleaning
My simple minded approach: IPA can be purified using a salting out process - because salt is not soluable in IPA but is soluable in water.? I dont know which process is actually used. But because I worry about residual salt in the remaining water portion, I avoid the low conc. versions. On Mon, 17 Feb 2025, 11:36 Dave Daniel via , <kc0wjn=[email protected]> wrote:
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Re: IPA type for 3.5mm connector clean ing
Some hardware stores also sell 99% IPA. For electronics I find 91% or higher has the best cleaning action.
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Doug ---------- Original Message ---------- From: "Dave Daniel via groups.io" <kc0wjn@...> To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] IPA type for 3.5mm connector cleaning Date: Sun, 16 Feb 2025 17:36:23 -0500 AFAIK, the difference between IPA solutions of different concentrations is the amount of water in them. IPA is naturally hydroscopic and will absorb water over time. For lab purposes, I use the highest concentration that I can find in the local stores, which is usually 99% IPA.
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I've actually been wondering if there is an easy method to determine the concentration of water in IPA solutions, since I assume that 99% IPA becomes less concentrated as it is exposed to the atmosphere over time. Perhaps specific gravity measurement.
DaveD
KC0WJN ?
On Sun, Feb 16, 2025 at 16:49 Calvin Guan via <guancalvin=[email protected]> wrote:
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Re: IPA type for 3.5mm connector cleaning
AFAIK, the difference between IPA solutions of different concentrations is the amount of water in them. IPA is naturally hydroscopic and will absorb water over time. For lab purposes, I use the highest concentration that I can find in the local stores, which is usually 99% IPA. I've actually been wondering if there is an easy method to determine the concentration of water in IPA solutions, since I assume that 99% IPA becomes less concentrated as it is exposed to the atmosphere over time. Perhaps specific gravity measurement. DaveD KC0WJN On Sun, Feb 16, 2025 at 16:49 Calvin Guan via <guancalvin=[email protected]> wrote:
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IPA type for 3.5mm connector cleaning
Hi,
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I am trying to clean the connector threads and surface of my 3.5mm VNA Calibration kits.
Keysight manual says use IPA but it doesn't say what kind of IPA. My local CVS has 70% and 91%, amazon has 99.9%.
Which one the best and saftest for the delicate devices like a cal kit?
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Regards,
Calvin |
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Re: Test Set Program Development Tool DEV_PL on 3.5" floppy
Yes Roy it is a nice gadget and there are equivalents for other media
as well. If you have all those machines and you still have the disks that go with them I suggest you get one and add images of your disks to archive.org or the VCF or something. I got into it because I am trying now to archive the work of my father's coworkers in the late 1970s to early 1990s on video graphics hardware. Drivers etc that likely no one else has by now. On Sat, Feb 15, 2025 at 3:13?PM Roy J. Tellason, Sr. via groups.io <roy@...> wrote:
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Re: Test Set Program Development Tool DEV_PL on 3.5" floppy
There's a newer version of lifutils here that's being maintained (last update Dec 2024):
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In addition to Linux, the developer has also included versions for macOS and windows 32/64 bit.
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-mark
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On Sat, Feb 15, 2025 at 05:12 PM, Tim Fagan wrote:
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Re: HP 8670B amplifier - does it ring a bell with anyone?
This is just a hail-Maty, check out the1985 - RF & Phase Noise Measurement Seminar (124 pages)? at
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The document mentions 8672 / 8673 as products and the "The HP 8670 family...." and it also goes in to detail how to use it in a system of things. |
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Re: Hp8660c repair, extender cards.needed.
IIRC, the kits for the different 8660 signal source models (A-D) are slightly different, with different HP part numbers. DaveD KC0WJN On Sat, Feb 15, 2025 at 20:43 David Feldman via <wb0gaz=[email protected]> wrote: Hello Olaf, |
Steve Byan
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