Re: HP 3456A Problem Solved
The Service Note states Serial Number Prior to 2201A06299. I haven't checked the serial number on mine but would be surprised that they changed the construction of those grounds. Maybe so. Thanks,
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n4buq
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#103724
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Re: HP 3456A Problem Solved
Barry The argument for restoring the original ground points has often to do with "ground loops" inside the unit. While not obvious most measurement levels, there are possible unexpected anomalies or
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Dave / NR1DX
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#103723
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Re: Testing dummy loads with a VNA
Thanks, Robert (and others who've assisted here with this query). A bit of background might be appropriate. I'm just a hobbyist and radio ham, albeit a bit more advanced than most. I bought this
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Jinxie
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#103722
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Re: HP 651B Oscillator restoration and an OOPS!!
It is possible that someone ordered from them, ther returned existing stock that wasn't properly inspected. I was involved in Sprague shutting down their plant near Oralando, 30 years ago. That one
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Michael A. Terrell
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#103721
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Re: 693B sweep oscillator restoration
You would be better off adding a transformer wired to buck the extra voltage. It won't generate a lot of heat, like the series resistir, and it won't degrade the line regulation. A transformer with a
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Michael A. Terrell
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#103720
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Re: HP 8591 external reference connector (1250-1499)
I used these RA cables on a couple of my HP3325A Function Generators, until I can try to make my own version of the originals. I wonder if there is enough market to try to sell them?
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Michael A. Terrell
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#103719
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Re: Testing dummy loads with a VNA
Hi Jinxie, You need your existing splitter (or better a 2 resistor 1 in 2 out one) an a Return Loss Bridge (RLB) either professional or one like this
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Robert G8RPI
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#103718
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Re: Testing dummy loads with a VNA
I think that an honest question regarding measuring SWR or return loss has gone off on a strange tangent. The answer to the question is relatively easy to answer if we know what frequency range is
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Stuart Landau
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#103717
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Re: HP System One feet
Hi Guys, I have some of the System 1 feet (Black with release in center). Not sure how many or cosmetics, but if interested, $5 + postage ea...Contact me off list Dan in Chandler, AZ
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Daniel Nelson
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#103716
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Re: HP 8591 external reference connector (1250-1499)
Thanks all. I have the right piece coming. -Matthew
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medasaro
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#103715
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Re: HP 3456A Problem Solved
Which versions of the 3456A does this apply to?? Or all three(?) -Dave
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Dave Seiter
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#103714
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Re: HP System One feet
I have noticed the same issue. Five years ago those things seemed really common, now it took looking on eBay for a couple of months just to find a single set of four. That said, I am sure they are
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medasaro
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#103713
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Re: HP 3456A Problem Solved
Larry, I had a similar symptom with my 3456A.? It was intermittent when I got it, but since it worked a good part of the time I decided to keep it and live with it. After a while the intermittent
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Bob Albert <bob91343@...>
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#103712
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HP 3456A Problem Solved
A few weeks ago, I reported a problem with my 3456A where it would fail at startup with "--------" on the readout and fail Test 3. I reseated one of the microprocessors and the problem seemed to go
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n4buq
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#103711
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Re: HP 8591 external reference connector (1250-1499)
Daun is right a bnc to bnc will work fine. Do it all the time. Any reasonable cable length will work. Have fun Regards Paul WB8TSL
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paulswed
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#103710
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Re: HP 8591 external reference connector (1250-1499)
All - Thanks. I am glad to hear that a regular piece of short quality BNC (HP 10502A or similar I presume) will work fine. I figured that the special form factor is just for mechanical convenience,
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medasaro
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#103709
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Re: Testing dummy loads with a VNA
Leave it to the ME to mess up the Ohm¡¯s law :) I meant of course F=ma vs I=V/R, and mass is then the equivalent of conductance, not resistance. D¡¯oh. - Kuba
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Kuba Sunderland-Ober
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#103708
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Re: Testing dummy loads with a VNA
I can chime in as a ME wearing an EE hat :) I see S11 measurement as essentially a shaker table measurement where you are not allowed to touch anything but the interface plane. Imagine a shaker and a
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Kuba Sunderland-Ober
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#103707
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Re: HP 8591 external reference connector (1250-1499)
Matthew: Re: Connector for Ref Osc Intetconnect It is not special other than being a low profile shape. A BNC - BNC cable will work fine. If you want a work around - two BNC Male-Female elbows + one
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Daniel Nelson
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#103706
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Re: Testing dummy loads with a VNA
What you missed Jeff is that he didn't state what sort of test equipment he had, and what frequency range he intended to use as well as connector types. With a modern piece of equipment like the
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Stuart Landau
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#103705
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