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Re: Digest Number 928
Hi Steve:
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In addition to what John has already said I'm like to remind you that many HP instruments were built using a Motorola 68000 uC and it's clock speed is much slower than today's PCs so it's good to put in some time delays to give the instrument time to process the command. Have Fun, Brooke Clarke w/Java w/o Java 1a. GPIB comms with 8753C |
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Re: GPIB comms with 8753C
sadavis80
John,
Thanks for the response. At some point I guess I'll need to try out your program (after I find enough time to figure out how to use it with my 8753 <g>). In answer ... **Send those commands with my query.exe command-line utility.... If I interpret correctly from your website, this will only gather a SINGLE sweep of data - my biggest problem is when I need to do multiple sweeps (maybe 50) with automatically reconfigured inputs from an antenna. Last night I was running some data and on several occasions, the transfer from the 8753 failed at least 10 times in a row before executing properly (from an identically running program loop). **Is there anything else on the GPIB bus... Occasionally there will be an 8640 (powered UP), but most of the time the 8753 is alone on the bus. I have observed no difference in operation either way. ** What timeout settings are you using? ... I'm using 10 seconds. The normal response time is in milliseconds. Each data point is represented by a 50 byte packet and I read the packets (one per data point) one at a time. I have also tried reading the data 1 char at a time (Boy is THAT slow), but I have the same problem with occasional failed reads. Hmmmm - I have looked at ibcntl, but not necessarily after a failed read (truncated data isn't useful in this case). I'll have to see if there is any consistency there - not that it would help me much to know, but it would be .... interesting <g>. **Are you terminating your command string with a CR, LF, or both? I have tried all 4 possible combinations - it seems to work equally well with any except LF/CR. CR, or LF, or CR/LF all work fine (or at least the same). I should also note an interesting corollary - on occasion, the reads will be progressing properly (it takes about 10 seconds to get all 201 points) and will STOP at some random location in the data set - the data will stay STOPPED for some random amount of time (up to as much as 30 seconds) with no error... then suddenly will pick up and finish the data set. I have checked the computer side of this and nothing appears to be "wrong" - the processor load appears normal (low), the hard drive isn't being accessed, etc. It's never happened (to my knowledge) more than once in a data set and doesn't happen very often - but it does happen. This has happened both from a program running within my (Delphi 6) IDE and also if it's running alone outside the IDE. I have not been able to determine exactly where it is within the program when this happens, but it appears to be inside the call to ibrd. How can it not timeout? Lots of this stuff is baffling me. I have also tried this with several different computers and 3 different GPIB control modules - 2 USB/GPIB-A units and a PCI based controller with a different version of NI-488.2. Same results in all cases. However, I have only a single 8753, so I can't try another one to see if it's the NA itself or not. The code base came from (Basic) example programs provided in the GPIB docs, but THEY apparently use a dll or something (that's not discussed) that is called from the basic code. All their info is based on code used in the dedicated HP computer (like the 9825) from that era. I would be really interested to hear that SOME ONE out there has successfully read multiple sweeps in consecutive loops from their 8753 without problems. tks, Steve |
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Re: Is For Sale Messages OK ?
im interested in thev broken test equipment too??
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----- Original Message -----
From: Rasputin Novgorod To: hp_agilent_equipment@... Sent: Thursday, January 25, 2007 11:35 AM Subject: Re: [hp_agilent_equipment] Is For Sale Messages OK ? --- Robert Hagenbach <rc_hagenbach@...> wrote: > Would anyone be interested in HP test equipment that needs repair? > Power meters, AC voltmeters, RF signal generators et-cetera. I would be; I get most of my gear that way. (I buy off eBay...) /b __________________________________________________________ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains. |
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Re: Is For Sale Messages OK ?
Jos Raven
Me too,
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send a list of available equipment to; jos.raven@... Jos PA0AMX At 09:35 25-1-2007 -0800, you wrote:
--- Robert Hagenbach <rc_hagenbach@...> wrote:Would anyone be interested in HP test equipment that needs repair?I would be; I get most of my gear that way. |
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Re: New Manual Website, Things is beginning to run now.
Tomas Larsson
Hi groups.
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Things is getting up and running now. The site is up, it seems like I got the file-area working (don't upload anyting to i yet though, there are some small issues to resolve, still). I have uploaded some manuals, and you can feel free to test-run it, and give me some feed-back As mentioned previously, the url is www.ebaman.com With best regards Tomas Larsson Sweden for downloads etc. For uploads use the free www.yousendit.com service. and send it to my e-mail address Excellent and cheap hosting, use Verus Amicus Est Tamquam Alter Idem -----Original Message-----__________________________________________________ Anv?nder du Yahoo!? ?r du tr?tt p? spam? Yahoo! E-post har det b?sta spamskyddet som finns |
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HP Equipment For Sale
Richard W. Solomon
Contact me off-list for particulars:
8601A Generator/Sweeper 3200B VHF Oscillator 3581A Wave Analyzer 8341A Synthesized Sweeper 35660A Dynamic Signal Analyzer 8922H GSM Test Set (Service Monitor Big Brother) All items work. Manuals for some are included. Pick-up in Lexington, MA preferred, but shipping is possible. Be aware, some of these are heavy and packing/shipping will Not be cheap. (The 8922H weighs 70 #). Thanks, Dick, W1KSZ |
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Re: GPIB comms with 8753C
John Miles
I'd suggest trying a couple of things:
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1) Send those commands with my query.exe command-line utility (see ) and see if it works any differently. That will help rule out programming errors on your part. 2) To verify your hardware's OK, try capturing a plot from the 8753C (run 7470.exe and hit 'w', then initiate an HP-GL plot from the 8753C's front panel; it may be necessary to put 7470 in listen-only mode via the GPIB menu, and/or put the 8753C in talk-only mode to make this work). If that can't be made to work, then you may have a hardware problem, because other users have definitely been able to capture plots from 8753As. 3) Is there anything else on the GPIB bus, particularly including any powered-down equipment? Try connecting the analyzer directly to your adapter for testing. 4) What timeout settings are you using? I'd use at least 10 seconds to receive a long ASCII trace dump (assuming that's what those commands do). Alternatively, try using very short timeouts (1 second or less) and a series of smaller reads limited to 256 bytes each, then terminate your overall read operation when you time out without receiving any data at all. (Keep in mind that even though you get a timeout error from ibrd(), you may still have read some valid data. What is your ibcntl value after a timeout error?) 5) Are you terminating your command string with a CR, LF, or both? Play with that and see if there's something the analyzer doesn't like. -- john, KE5FX -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]On Behalf Of sadavis80 Sent: Thursday, January 25, 2007 6:02 AM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] GPIB comms with 8753C I have been using a USB-GPIB-A adapter to talk to my 8753C and continue to have trouble sending and reading information without errors. Has anyone else used GPIB to communicate with an 8753? |
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Re: Is For Sale Messages OK ?
Rasputin Novgorod
--- Robert Hagenbach <rc_hagenbach@...> wrote:
Would anyone be interested in HP test equipment that needs repair?I would be; I get most of my gear that way. (I buy off eBay...) /b ____________________________________________________________________________________ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains. |
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Selling items on this list
Thomas Fowler
As founder and moderator of this group (which seems to be prospering thanks to all the efforts of its members) let us have the following policy for selling test equipment items. If you have something for sale personally (no commercial sales, please!), list the items and if you like the price, and ask members to contact you off-list if they are interested. I think that this is a worthwhile service for the group members.
-- Thomas B. Fowler, Sc.D. Senior Principal Engineer Mitretek Systems 3150 Fairview Park Drive Falls Church, VA 22042 703-610-2944 Fax 703-610-2399 tfowler@... |
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GPIB comms with 8753C
sadavis80
I have been using a USB-GPIB-A adapter to talk to my 8753C and
continue to have trouble sending and reading information without errors. Has anyone else used GPIB to communicate with an 8753? I have finally found what should be sufficient documentation, but it just doesn't want to work the way the book says. The OPC commands "seem" to work the way they should - I get the '1' response, however, often times the following command will generate an error and will not be recognized. On reads using a command like POIN 201; CHAN1; FORM4; SING; OUTPFORM; (copied from an example program from HP) I almost always get the first point response, but the rest often do not come and I get a timeout error. If I put the entire sequence in a loop (loops back on timeout error), then it will read correctly some times and some times it will fail. I have tried MANY MANY different delays between the sequential reads and have finally gotten it to work fairly reliably, but acquiring the data takes considerably longer than it should (due to the required delays). Yesterday, I thought I realized that the 'CHAN1;' part of the above was causing problems so I separated the command and now send POIN 201; CHAN1; FORM4; as a separate command before the point loop (CHAN1 is OPC'able, but it doesn't seem to matter). Then a short delay and then SING; OUTPFORM; before entering the read data loop. It seems to work a little more reliably, but I still have to have more delay than should be necessary between read requests (ibrd). I also determined that if I read the first 10 points or so slower and "get it going" (so to speak), I can then drop the delays altogether and read the subsequent points without error (MOST of the time). This all just seems WEIRD to me - I wonder if my 8753 has a problem or is it just characteristic of that model. I'm using a fairly fast computer (1.5 - 2 GHZ Intel PC with WinXP), but the docs say the GPIB drivers should 'get' the data when the 8753 is ready to send it - but it doesn't work that way exactly. Apparently, I can make the ibrd request before the 8753 can recognize it and it hoses the works. I wonder if the older GPIB drivers and the older 8753 just weren't designed to work with these new much faster computers? Anyone have info, thoughts or ideas? tia, Steve |
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Re: Is For Sale Messages OK ?
Robert Hagenbach
Would anyone be interested in HP test equipment that needs reapir? Power meters, AC voltmeters, RF signal generators et-cetera.
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Didier Juges <didier@...> wrote: You would not be the first one, or the last one :-) Didier KO4BB Richard W. Solomon wrote: I have several pieces of HP Test Equipment that I need to |
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Re: HP 5351B counter
In the last 3 months on eBay, there have been three attempts at selling a single
5351B (270046272591, 270052702560, 270058523120) at $1995. No takers. So all that tells us, is that's what someone wants to get. Sorry I don't have anything further back in time. A 5351A (120057862525) on the other hand sold for $950, so at least you have some range (albeit statistically small) to consider. If it has Option 001 or 010 (OCXO HP10811) then it's probably close to the original cal. Or you can get you a GPS Disciplined Oscillator jack it in as an external oscillator and never have to worry about calibration again. See page 126 _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of Steve Sent: Wednesday, January 24, 2007 7:37 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] HP 5351B counter I ran across an HP 5351B counter that looks to be in good shape cosmetically and operationally. The guy said he'd think about selling it to me. What's the price range? It hasn't been calibrated for several years, so if I buy it I'll likely send it to a cal lab. Anyone have experience with this counter? Does it have a history of problems? A good reputation? Other? Thanks. Steve K8JQ |
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Re: Is For Sale Messages OK ?
Mark
A Colleague of mine reckons it is harder to ask permission first than
to apologise later! --- In hp_agilent_equipment@..., "Richard W. Solomon" <w1ksz@...> wrote:
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Re: Is For Sale Messages OK ?
Didier Juges
You would not be the first one, or the last one :-)
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Didier KO4BB Richard W. Solomon wrote: I have several pieces of HP Test Equipment that I need to |
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8505A counter problem
I posted the following on the 8505A group but I'm not sure if anyone
is using it. All my messages come from here so I will repeat it here. My HP 8505A Freq Counter displays incorrectly. The actual frequency out seems normal in CW and Sweep modes on all three ranges but the counter reads three times the frequency. When increasing the frequency slowly (CW) the units and tens increment correctly but the hundreds digit counts 1, 3, 5, 7, 9 (I'm talking about the third digit from the right, ignoring the decimal point). The higher digits count OK but the third digit seems to change going 33, 66 and 99 on the lowest digits but not every time. It depends on the value of the third digit. Refer to Fig C3-66 A2A5 Prescaler/Counter schematic: U6 (a 4029 presettable up/down CMOS counter is acting up; The QA (pin 6) output stays high, the other outputs seem normal as though there were twice the number of input pulses, but there are only 5 input pulses on pin 15 between the Carry Out pulses (pin 7). It seems like the input pulses are bypassing the first flip-flop. I checked every pin signal, the +5 volts, and looked for noise or oscillations with a 300 MHz `scope (Tek 2465). I cut the trace from pin 6 to U13 pin 2, no difference. I placed a 1K resistor from pin 15 to +5 volts to sharpen the input pulses, no difference. I then replaced the 4029 chip (U6) but there was no change. I then bread- boarded the U6 and U3B circuit and it works perfectly. I shorted pin 6 to the +5 volts and it still works perfectly. I lowered the power supply to 4 volts and it still works. Now I wish I had socketed the 4029 instead of soldering it in. I may do that yet - cut all pins, unsolder pins one at a time, solder suck the holes, clean and install. Does anyone have any other suggestions? My brain is about to implode. Peter. |
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Re: Is For Sale Messages OK ?
list them please
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----- Original Message -----
From: Richard W. Solomon To: hp_agilent_equipment@... Sent: Wednesday, January 24, 2007 6:43 PM Subject: [hp_agilent_equipment] Is For Sale Messages OK ? I have several pieces of HP Test Equipment that I need to pass on before I move. Is it proper to list them here ? Thanks, Dick, W1KSZ |
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HP 5351B counter
Steve
I ran across an HP 5351B counter that looks to be in good shape cosmetically and operationally. The guy said he'd think about selling it to me.
What's the price range? It hasn't been calibrated for several years, so if I buy it I'll likely send it to a cal lab. Anyone have experience with this counter? Does it have a history of problems? A good reputation? Other? Thanks. Steve K8JQ |
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