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Re: Advice on how to use an SA for test point troubleshooting
Tony In years past I made probes from two resistors and a length of coax. The probe was made of a series 5100 ohm resistor that connected to the center of the coax cable. A 51 ohm resistor was placed
By Chuck Moore <wd4hxg@...> · #132727 ·
Re: HP 212A pulse generator - asbestos inside!
Asbestos can be removed quite safely if you soak it with water before disturbing it. It will become a soft gooey mess which can be bagged and disposed of in an approved disposal facility.
By SCMenasian · #132726 ·
Re: HP 212A pulse generator - asbestos inside!
Chuck- you are not the only one having the same info, I had the same. before that growing up in the 60's we did our own brake work ( no air blowing) , wrapped pipes with disgarded asbestos sleeves,
By Ren¨¦e · #132725 ·
Re: 8662A questions
You might also perform troubleshooting test 15 for BD9 as described in vol 2 of the manual. Matt "Dave Miller" <ve7hr@...> writes:
By Matt Huszagh · #132724 ·
Re: 8662A questions
"Dave Miller" <ve7hr@...> writes: I'm sorry, I don't recall, but I want to say that's correct. Since you have other units, I'd check the behavior against those. If those aren't accessible I can
By Matt Huszagh · #132723 ·
Re: HP 8662A A2 Slots
What¡¯s the serial number of your unit? HP got rid of the ROM/RAM board in put all the necessary ROM/RAM on an existing board after some revision. Is your unit working? If so, your unit is almost
By Matt Huszagh · #132722 ·
Does an HP Transformer Specification Document exist ?
Did HP have a Transformer Specification Document ? similar to the Tek version: https://w140.com/Transformers_ 120-1007-00_to_120-1349-00.pdf (
By gren · #132721 ·
Re: Advice on how to use an SA for test point troubleshooting
"Tony" <tonycox01@...> writes: If you have it, I'd probably use a high-frequency passive probe for this. For example, the PMK PML series: https://www.pmk.de/en/products/2_5_mm_tastkoepfe I think
By Matt Huszagh · #132720 ·
Re: Advice on how to use an SA for test point troubleshooting
A x10 scope probe won't work well with a SA because the probe is made up of a 9M series resistance that works with the 'scopes 1M input resistance to make x10. The SA has a 50R input resistance, so
By Adrian Godwin · #132719 ·
Re: HP8510 push-buttons
No, I would not use tuner cleaner or any of its descendants. 91% IPA, sprayed liberally (eg. soak it!) does everything that is required. Use a spray bottle, like is used for ordinary window cleaner.
By Chuck Harris · #132718 ·
Re: HP 212A pulse generator - asbestos inside!
One thing that doesn't get mentioned much is the small particles of asbestos don't survive exposure to moderately high heat and to sunlight. Or, so said the engineering course I took on air pollution
By Chuck Harris · #132717 ·
Re: 8662A questions
Hi Askild, I have the Artech manuals on the 866A that are wonderful scans. I will grab the 8663A set once I am about to work on the 8663A. The 2 8662A are enough of a handful. They are apparently
By Dave Miller · #132716 ·
Re: 8662A questions
Hi Paul, I probably did not explain properly. I am referring to the diagnostic LED¡¯s on the front most card on the left side of the card cage. That one shows using 7 LED¡¯s which key has been
By Dave Miller · #132715 ·
Re: Advice on how to use an SA for test point troubleshooting
Do you have a scope? If so try that first. Even if the BW is lower than 500MHz you should be able to see some signal and it will give you DC levels. That should let you determine if there are SA
By Stephen Hanselman · #132714 ·
Re: 5086-7337 *Yig Oscillator issue*
Hi Ruben, I was thinking of the main coil. The FM coil can be ignored for now, as it only affect the frequency a little. Probably good to check the heater and FET drive as well. Regards, Askild
By Askild · #132713 ·
Re: Advice on how to use an SA for test point troubleshooting
dBm is a power reading, so it cannot be made without knowing the impedance at the point of measurement. They probably mean dBm @ 50 ohms. I think you will be able to observe that the test point is at
By Chuck Harris · #132712 ·
Re: 8662A questions
Oh my 8662 and 8663s are indeed heavy no more than one on the bench at a time... At least my bench. If all the displays are on thats like a power start up and then suspect the unit hangs. Definitely
By paulswed · #132711 ·
Re: 5086-7337 *Yig Oscillator issue*
Hi Askild You mean the main coil or the FM coil? Maybe I should do a test setup and measure de current drawing of both coils, heater and final stage FET amplifier¡­ Regards, Ruben
By RubenRubio · #132710 ·
Re: HP 212A pulse generator - asbestos inside!
Greetings, To add my less than 2 cent¡¯s worth. Many older appliances such as stoves, hot plates, and the like used asbestos insulated wire. Ken
By ken chalfant · #132709 ·
Re: HP 8662A A2 Slots
my working instrument has the same slots empty (it¡¯s difficult to see the light blue guide in this picture). The 8662A has a lot of variation in the card configurations over it¡¯s various versions
By Tony · #132708 ·