Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: 456A current probe
can it
be that my rubber has just spun around hiding the hole? Yes it did spin around.........at first try it would not budge......second try after posting the original query found that more might was needed in the effort and lo and behold it did move and turning it 355 degrees still showed no hole, the last few degrees, and lo and behole.....there she be! |
|
456A current probe
Was thinking of cutting the double banana plug off, and replacing it
with Bnc (with the shunt capacitor also). Was also thinking of putting BNC on the amp for both probe and another for the output. This also means putting BNC on the probe too. The cable is .195" dia and heard that it is 75 ohm but don't remember where. Which leads me to figure on 50 or 75 ohm connectors (how can you tell by looking at BNC?) There also is a 100/1 divider available for this probe that connects to the probe end microdot connector, any facts on what in this little divider? The probe goround lead in the manual shows what appears to be the end screwing into the rubber of the cable strain relief, surely the rubber does not get used for the threads does it!!! I have another probe which at least has a threaded hole beneath in the metal, can it be that my rubber has just spun around hiding the hole? With a BNC on the end of the probe does it become a 1110a probe? Any other ideas to spiff up this probe a tad? Maybe bells or whistles!! Maybe its just getting late!!!!!!!! Thanks guys Dave |
|
Re: hp 83522a 2.4 ghz rf plug for 8350b
开云体育Thanks for the helpful suggestions,? I will
check the voltage potential on my DVM.
?
Regards
?
Richard Murray |
|
Re: hp 83522a 2.4 ghz rf plug for 8350b
开云体育jm
?
I checked the manual on my protek 506 dvm & it
said that the test current for diode testing is 1 ma.? The diode in
question is acting as a switch which is controlled by a bias voltage based on
frequency which is controlled by a MUX24FQ 4 channel analog ic.? If the mux
has failed then the bias will not be correct.? When I meter the circuit in
question I get -.34 v. relative to ground which would keep the diode off.?
In any event I just tested the main osc. on the unit and it has stopped working
& I had it up & running last week after resoldering the osc. control
board.? Frustrating.
?
Thanks
?
Richard
?
? |
|
Re: hp 83522a 2.4 ghz rf plug for 8350b
I do not think that it is current that would kill schottky diode, it is
toggle quoted message
Show quoted text
reverse voltage that might do it in. Some of very old meters were putting 100 mA on low ohm range, but I do not think that there are any of those left functional. Most digital meters use 1 mA current source and then measure voltage. I understand that some of those DVMs have output voltage that reaches level of its supply buttery and that is where you can damage a schottky. Oops, I went to check my Fluke and that is one of those 'schottky diode damaging meters' that applies 8 V plus to output terminals at no load; I was under impression that Fluke used a voltage clamp for all Ohm ranges, but, I guess, I was fooled. It is funny that my 'Harbor Freight Special', $3.99 meter is using 0.85 mA and output voltage does not exceed 2.6 V, what would be satisfactory for schottky diodes used in sampling bridges. Regards Miroslav Pokorni ----- Original Message -----
From: "John Miles" <jmiles@...> To: <hp_agilent_equipment@...> Sent: Friday, September 05, 2003 7:56 AM Subject: RE: [hp_agilent_equipment] Re: hp 83522a 2.4 ghz rf plug for 8350b Couple of ways:your VOM doesn't exceed it. Possibly need to disable autoranging on the meterto make sure. |
|
Have HP parts and info, looking for parts...
wshawlee2
We have a good cross section of HP parts for test gear, plus an
extensive on line cross reference for HP semiconductors, and a look up table for many CRTs. you can see this info here: we are always looking for HP parts in good condition for repairs, especially knobs, CRTs and display parts, happy to trade or buy. We also have a lot of items that get scrapped as not worth repair, happy to send for free for the cost of shipping, especially to schools, if you tell us what you are looking for. all the best, walter |
|
Re: hp 83522a 2.4 ghz rf plug for 8350b
John Miles
开云体育Couple
of ways:
?
1) See
how well it acts as a mixer in the frequency range in question.? (This is
what I usually test, since the DUT is usually part of a?mixer
assembly.)
2) Use
a curve tracer with appropriate current limits.
3)
Look up the diode's maximum forward current limit and make sure that your VOM
doesn't exceed it.? Possibly need to disable autoranging on the meter to
make sure.?
?
--
jm
?
|
|
HP 3469B multimeter
Hi all,
I've got an HP 3469B multimeter that's not behaving as it should - the display is behaving sensibly, but the values bear little relationship to the electrical signals applied. Nothing looks brown/smoked inside, and it has the largest multi-gang rotary switch which could have some dirty contacts. Anybody know anything about the insides of these? Do calibration/service manuals exist? I'll start tracing the circuit and checking levels but I'd prefer some intelligence before going in blind. Thanks, Michael |
|
New file uploaded to hp_agilent_equipment
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the hp_agilent_equipment group. File : /HP parts Xref.pdf Uploaded by : twobores <rsawday@...> Description : HP part no Xref You can access this file at the URL To learn more about file sharing for your group, please visit Regards, twobores <rsawday@...> |
|
Need knobs for 3580A spectrum analyzer
dr_charlesmorris
I have a good-condition HP 3580A spectrum analyzer with many broken
knobs. All four of the span/resolution/sweep knobs to the right of the CRT are busted, as well as the input attenuator knob. Since the scales are part of the knob, not the instrument panel, working with it is rather annoying. HP no longer supports this instrument and the knobs are not available from them. I have tried without success on the net to find surplus knobs. Can anyone help? thanks Charles |
|
Re: Difference between 54111D and 54112D
xaos
开云体育Dave,Sometimes when I fire up all my equipment, I wish I had a pair of those hearing protectors that construction workers use. The whiniest (if such a word) of my equipment is definitely the HP 5370A counter and it's brother the 5370B. But the loudest is the 8660C. Once I had to repair the 8660C, and I went deaf before I was through. Now, add to that the AC unit that keeps the room cool, and you can imagine what it sounds like in here. One weird thing happened lately was I purchased a Systron Donner Time code reader/generator (IRIG-B) and it had a faulty PS. Well, It was nothing more that a blown cap, but when I fixed it I realized that is was using a switched PS for the +12V. The design of the PS made it whine like crazy around 12KHz (or so). It is sooo annoying! Anyway, Paypal just informed me that it will be sending you the amount for the CD. Many thanks for your comments, -George nr1dx@... wrote: George |
|
Re: Difference between 54111D and 54112D
George
You definitely know the fan is on ..... It is definitely noiser than a tek 7904 , 496 or a 2200 series... not what I would call objectional per se but far from silent. I think HP in general likes to move more air than Tek. Of my two 54111D's one is slightly more noisy than the other. I also have a big rack mount HP 6.5 digit precision DVM ( I forget the number) which makes more noise than the 54111D by 2x sounds like a jet engine winding up. Will get that 54111D CD out to you right away... Dave On Thu, 04 Sep 2003 13:45:21 -0400 xaos <xaos@...> wrote: Hello Dave,<TEXTAREA NAME="Signature" ROWS="4" COLS="60"><TEXTAREA NAME="Signature" ROWS="4" COLS="60"><TEXTAREA NAME="Signature" ROWS="4" COLS="60"> |
|
Re: Difference between 54111D and 54112D
xaos
开云体育Hello Dave,How about this for a coincidence: I just purchased the 54111D manual on CD from you at eBay. I figured I'd look the manuals over before I made a decision. Thanks for your input. I was looking into the Tek 11403 which also has a color display but is is much slower. The Tek suffers from the same problem as the 54111D, namely that it cannot be serviced since the schematics were never published. Question: I have a 8660C Signal generator which sounds like a steam train when I power it up. How is the noise level of the 54111D? I see that it has two big fans in the back. 73, George H, N2FGX nr1dx@... wrote: Other things to consider in owning either of theses scopes |
|
Re: Difference between 54111D and 54112D
Other things to consider in owning either of theses scopes
I have a love-hate relationship with my (2) 54111D's On the love side... 1)They are very easy to use, the menus are well thought out and largely intuitive. a very felxible scope 2) The large color screen is a joy to use 3) They do lots of cool stuff 4) for what you get they are very cheap on Ebay even at $500+ On the hate side.... 1) THEY ARE HEAVY...About 50lbs 2) THEY ARE BIG .. 19" wide...24" deep 3) They are for the most part not repairable at the componenet level even if the service manual covered that which it doesn't. Spare boards and input amps are next to impossible to come by. Dave H On Thu, 04 Sep 2003 14:21:20 -0000 "tbfowler100" <tfowler@...> wrote: 54111D: 500MHz, 2 Ch, 2GS/s max, 8K record length, Color CRT, Auto measurments, IEEE-488 interface. Out of production '94, out of support '99.<TEXTAREA NAME="Signature" ROWS="4" COLS="60"><TEXTAREA NAME="Signature" ROWS="4" COLS="60"><TEXTAREA NAME="Signature" ROWS="4" COLS="60"> |
|
Manual for HP 226A Time-Mark Generator
Hi,
First off this is an excellant idea for a group and I wish it much success, but I guess that really depends on us and how we use it! I have acquired a HP 226A generator and am looking for a manual which will permit me to adjust the output. I am not sure how much variability is available in the design (a schematic would help here) but the output seems to be very low at the lower periods. Hard copy, photocopy or best of all pdf would be greatly appreciated! Thanks, Mitch |
|
Re: hp 83522a 2.4 ghz rf plug for 8350b
gleamfollower
--- In hp_agilent_equipment@..., "inert12001"
<inertial@j...> wrote: I'm having a problem with the sampler board. I have service manualafter the schotky diode which checks ok on my DVM. Anyone have anyNot usually a good idea to check these diodes with ohmmeters or (especially) DVM diode-test functions. You may have blown the diode. :( |
|
Difference between 54111D and 54112D
tbfowler100
54111D: 500MHz, 2 Ch, 2GS/s max, 8K record length, Color CRT, Auto
measurments, IEEE-488 interface. Out of production '94, out of support '99. 54112D: 100MHz, 4 ch., 400MS/s digitizing rate, 9" color CRT Auto measurment, GPIB interface. Out of production '93, out of support '99. For more detailed info on these and many test instruments, go to www.testmart.com and search on the model number (e.g. hp 54111D). |
to navigate to use esc to dismiss