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- HP-Agilent-Keysight-Equipment
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Free GPIB software for Prologix GPIB USB Interface
Ulrich Bangert
Hi folks,
I am a newbie to this group. While I own a number of older HP devices this is not the reason why I enter this newsgroup. Instead, the people at Prologix told me that my EZGPIB utility that I have programmed for their USB GPIB Interface might be of interest to some of you. So, if you own a Prologix USB GPIB interface or plan to buy one: I have done a utility that gives you high level access to the Prologix USB GPIB interface in a PASCAL like programming environment without the necessity to deal with low level serial programming. It is freeware. If your are interested I suggest you download the (still not complete) manual from and the complete utility with examples from Have fun with it and send me your feedback for improvements! Ulrich Bangert df6jb@... Ortholzer Weg 1 D-27243 Gross Ippener Germany |
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Re: HP8568B on screen text intensity - FIXED !!!
Didier Juges
Don't feel bad, you learned something (we all did), the instrument is working and your wallet is not depleted, that's all that matters :-)
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A lot of these magnificent instruments do have CRT wear-out issues, and this has been addressed here many times, so you are actually one of the lucky ones. I'll take lucky over smart any day :-) Didier KO4BB david_woodhead wrote: Well I feel pretty stupid as all it was was an adjustment! - the intensity limit pot (R516) was incorrectly set. It's not imeadiately obvious from the schematic but this POT has the effect of offsetting the Z intensity and pushing the lower intensity (voltage) levels into cutoff but with little effect on the higher intensity levels - this was exactly what I was seeing. |
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Re: HP8568B on screen text intensity - FIXED !!!
Well I feel pretty stupid as all it was was an adjustment! - the
intensity limit pot (R516) was incorrectly set. It's not imeadiately obvious from the schematic but this POT has the effect of offsetting the Z intensity and pushing the lower intensity (voltage) levels into cutoff but with little effect on the higher intensity levels - this was exactly what I was seeing. Thanks for the comments posted. David. --- In hp_agilent_equipment@..., "david_woodhead" <david_woodhead@...> wrote: the trace line lengths get shorter. On screen text, consisting of shorton TP301 (Z axis output) with 0 volts being the bottom graticule. Thevisible) trace. |
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Re: HP8568B on screen text intensity
Didier Juges
Chuck Harris wrote:
Hi David,There is a third fix: a company (I forgot whom, but they should not be too hard to google, or John Miles can post it here) makes a color LCD replacement for the entire display. Pretty neat, and great use of color. It's not cheap, but worth it, considering what these instruments are worth in good condition. This replacement makes it better than new! Didier KO4BB |
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Re: HP8568B on screen text intensity
Hi David,
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You have a low emission CRT. Most HP CRT's are on RF instruments where the operator feels inclined to leave the instrument on 24/7 to keep it warmed up and stable for use at a moment's notice. This wears out the cathode in the CRT's gun assembly, and makes it become increasingly dim, and blurry. There are only two fixes for this problem: 1) replace the CRT, something that is becoming more and more difficult, and 2) restore/rejuvenate the CRT, a process that sometimes extends the useful life of the CRT for a good while. I have restored several HP CRTS (I have never needed to do a tektronix CRT) using my Sencore CR70 CRT restorer. The Sencore CR70, and CR7000 are about the best that are routinely available. They were made for the television/ computer monitor repair market, but are equally applicable to scope, and test equipment CRT's. After you have restored/rejuvenated a CRT, you should avoid leaving the instrument on 24/7. If you only turn it on when you need it, it will last you for many many years. If you use it 24/7, it might last you only another couple of thousand hours. Each additional time you restore/rejuvenate the CRT, you get less of an improvement, and less additional life, until it just quits. -Chuck Harris david_woodhead wrote: I have 2 of these analyzers and both demonstrate exactly the same problem - the trace intensity becomes inreasingly less visible as the trace line lengths get shorter. On screen text, consisting of short lines, is barely visible (unless I really turn up the intensity control). |
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HP8568B on screen text intensity
I have 2 of these analyzers and both demonstrate exactly the same
problem - the trace intensity becomes inreasingly less visible as the trace line lengths get shorter. On screen text, consisting of short lines, is barely visible (unless I really turn up the intensity control). Has anyone else seen this? I have posted a pic here of the signal on TP301 (Z axis output) with 0 volts being the bottom graticule. The intensity control is adjusted for a low intensity (but clearly visible) trace. I'd appreciate hearing from anyone that might have seen this or can compare my scope trace with thiers? David. KM5TZ |
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Re: [TekScopes] Want to use a high-res voltmeter in the Portland Oregon area
Thanks Lars, but that instrument is only specified to
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1% accuracy. I need one that's about 10000 times better. And so do you! Please, send further replies off-list to avoid crossposting. If I hear anything of interest to the lists, I'll forward it. Dave -----Original Message-----
From: Lars Ahlstr?m [mailto:lea56@...] Sent: Friday, January 12, 2007 3:16 PM To: David Wise; hp_agilent_equipment@...; TekScopes@... Subject: SV: [TekScopes] Want to use a high-res voltmeter in the Portland Oregon area Hi Dave, I could recommend this one. Ebay: 140070877954 I think its just a question of square dollars. ;) I have the former model, and this one has even BNC out. Its just great, I checked my 8520's with it... allmost just zeroes after the dot... =) They have a UK website as well: (where you can se their former one) /Lars -----Ursprungligt meddelande----- Fr?n: TekScopes@... [mailto:TekScopes@...] F?r David Wise Skickat: den 12 januari 2007 23:09 Till: hp_agilent_equipment@...; TekScopes@... ?mne: [TekScopes] Want to use a high-res voltmeter in the Portland Oregon area I have a couple of 5-1/2 digit differential voltmeters (Fluke 877A and 895A) in whose calibration I have lost confidence. Since (a) I don't have cubic dollars to spare and (b) it's Just A Hobby, a cal lab is out of the question. Do you know of anyone local to me (Portland Oregon) who has a 6-1/2 digit or better voltmeter that's in good cal? I will also gladly accept suggestions for other places to ask. No profits are riding on this. I'm doing it just for the heck of it, to satisfy myself that they're in spec. Thanks, Dave Wise |
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Want to use a high-res voltmeter in the Portland Oregon area
I have a couple of 5-1/2 digit differential
voltmeters (Fluke 877A and 895A) in whose calibration I have lost confidence. Since (a) I don't have cubic dollars to spare and (b) it's Just A Hobby, a cal lab is out of the question. Do you know of anyone local to me (Portland Oregon) who has a 6-1/2 digit or better voltmeter that's in good cal? I will also gladly accept suggestions for other places to ask. No profits are riding on this. I'm doing it just for the heck of it, to satisfy myself that they're in spec. Thanks, Dave Wise |
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Re: CLIP for 8753A?
If your friend isn't planning on keeping his 8753A turned on 24/7,
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he can probably restore the CRT's brightness by using a common CRT restorer/rejuvenator. I have done this with other HP CRT's, and had good success. Another poster has done some life experiments, and found that the restored/rejuvenated HP CRT's have quite a few hours left in them after the procedure is done. -Chuck Harris rovmkr wrote: Hi Dean, I'm not sure what you are looking for on the 8753A but on behalf of a friend without internet (dont ask)... His HP 8753B has a very faint display, does he need a new CRT? Any one with similar experience? Any one know where to get one? |
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Re: CLIP for 8753A?
Hi Dean, I'm not sure what you are looking for on the 8753A but on
behalf of a friend without internet (dont ask)... His HP 8753B has a very faint display, does he need a new CRT? Any one with similar experience? Any one know where to get one? He needs to scan continuous to 6 GHz and is thinking of an 8753D with opt 006. Will this do it or is it in two bands? Anyone know where to get one? Another thought is the 8752C but is the instruction set for these different instruments the same as that of the 8753B? He doesnt want to re-write the software. We need to get hold of a catalog in the mid '90s. Peter. --- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...> wrote:
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HP1000 gold plated prototyping board with bus decoders
Hi Chaps,
Have an HP1000 prototyping board, its gold plated and fits in the CPU chassis, has 11 bus decoder logic chips and room for 40+ ICs, in excellent condition :0 Anyone still using these around the traps / Regards from Mike Massen Network Power Systems Lab +61 (0) 8 9444 8961 Mb +61 (0) 438 048961 Perth, Western Australia * USA GMC, Opel and Australian VL/VK/VN,VP Commodore Fuse Rail that wont warp or melt ! * RB30 Skyline/Nissan/VL Upgraded ignition driver now in long term economy trials * Twin tyres for most sedans, trikes and motorcycle sidecars * Industrial grade PolyVinyliDeneChloride (PVDC Copolymer) in bulk, the best oxygen and water protective barrier you can find for circuit boards. * Special Equipment for sale: 60KVA 3-phase UPS with large battery cabinet - $12,000 Web site under construction, Ebay and Oztion Auctions |
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Re: 1820-0098 decade divider IC for 5321A
marc_bury
--- In hp_agilent_equipment@..., "arthurok" <arthurok@...>
wrote: crystal osc down to 5 hz i think a 7492 is a divide by 12 counter.More informations on the schematics: The logic power supply is +5V (more exactly 5,1V according to the manual), the logic is TTL (not ECL) but the function of the I/O pins is not totally trivial. The decade divider chip 1820-0098 picks up its 100Hz input with a capacitor coupling just behind the 155V high voltage rectifier. The chip has an input pin and divide by 10 output cascaded to another divide by 10 chip, a reset input, plus a couple of less obvious pins: I named them control input and controlled output. The controlled outputs from the two cascaded dividers are connected together directly and to the Clock input of the counter Main Gate JK flip-flop. The control pins are connected to the gate time selector switch that can ground one or the other divider's control pin. The logic appears to be: grounded control pin => controlled output is active divide by 10 output, else controlled output is high Z. So I guess I could effectively replace this chip with a modern decade divider such as a 7490, a logic OR and an open collector transistor. My main option is still to try to find a spare chip ... -Marc- |
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Re: Powering a HP 1141A probe
Robert Hagenbach
Mark,
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Thanks! I am watching the item now! Bob Mark Kahrs <mark.kahrs@...> wrote: Why bother? Just buy a 1142A supply; one is on epay right now for $9.99. On 1/10/07, Robert Hagenbach <rc_hagenbach@...> wrote:
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Re: Digest Number 912
Chris Bartram
--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@... I just want to add that I need a schematic for the frac-N digitalI'm also chasing a sporadic problem with my 8753B - it appears to also be in the Frac-N synthesiser board. Maybe a 'sticky' gate. I've been asking around about a CLIP for about a year. Someone did contact me with an offer of a pack for $100, which I'd be quite prepared to pay - particularly at the current UK?-US$ exchange rate(!!) - but I lost his email address in a bout of finger trouble. I've also emailed Mike Kawasaki at Agilent, who has been extraordinarily helpful, but has not been able to assist with the CLIP. My suspicion is that the early 8753 analysers still form a revenue stream for Agilent repair facilities, and that they are (understandably) reluctant to allow the information into the public domain. Cheers Chris GW4DGU |
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Re: Powering a HP 1141A probe
Why bother? Just buy a 1142A supply; one is on epay right now for $9.99.
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On 1/10/07, Robert Hagenbach <rc_hagenbach@...> wrote:
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Re: spectrum analyzer 1st mixer
Hi erik,
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Whether you can repair HP mixers at home probably has to do with what you have at home to work with ;-) I would have to see the mixer in question. It probably requires a microscope, and a wire bonding machine... but maybe not. I have friends that have put new transistors in HP hybrids from that time frame with a microscope, some silver epoxy, and a steady hand. -Chuck Harris erik wrote: On Tuesday 09 January 2007 21:30, Chuck Harris wrote: |
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Re: 1820-0098 decade divider IC for 5321A
does the unit use a 5 volt power supply?
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one trick would be to build up a circuit to divide a crystal osc down to 5 hz i think a 7492 is a divide by 12 counter. 7490 is divide by 10 in ttl ----- Original Message -----
From: marc_bury To: hp_agilent_equipment@... Sent: Thursday, January 11, 2007 1:01 AM Subject: [hp_agilent_equipment] 1820-0098 decade divider IC for 5321A Hello group, I have an "almost" working HP 5321A counter. It is a small 4 Nixie tubes counter with modest frequency capability, and my problem is that this instrument uses the 60 Hz power source as its reference, but I live in a 50 Hz area... According to the manual, the 50 Hz option includes changing an IC from a "divide by 6" to a decade counter. Nothing surprising there, but I found that the afore-mentionned decade IC is an HP specific part: 1820-0098. (8 pin TO like metal can) And Google only leads me to the usual sites reserved for professionnal traders. (Sphere does not carry this reference) So if any good soul in the group has a spare 1820-0098, or a defunct board for an HP counter in this range (there is another decade divider on the board, also 5321A and 5221A are basically the same instrument), I would be glad to arrange a trade. Alternatively a datasheet, or equivalent modern reference would allow me to restore my 5321A to normal counting if not with original parts. Thank you for reading, Marc |
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