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Foam for active probe carrying cases
¿ªÔÆÌåÓýI have a couple HP active probes (54001A and 1145A).? The foam inside
the carrying cases is deteriorating rapidly and getting very messy.? Has
anyone any suggestions as to how to cut or mold new foam for the carrying
cases?
I've worked with rigid foam before but that could be cut easily with a
utility knife, but?that doesn't seem to work well with the type of foam in
the probe cases.? It's just too soft.
I'm thinking a hot wire cutter would probably be best to shape the
cutouts.? I'm open to suggestions that might work better.
?
Thanks, Dave M |
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Yes, the 8753D has a CRT display.?? I use the external display as it is far easier to read but one has to be more careful about button pushing!? The LCD replacement is a better solution but more expensive. The use of the external keyboard is an improvement that everyone can do, and at low cost.? Just plug it in and quit the time-consuming letter-by-letter labeling.? That one is a "No Brainer". I will follow this thread to see what LCD display is functional on the HP8753D at the lowest cost. I assume that there can be repair issues that should be undertaken first that would be less costly. Those would be of interest to me. Ed Lawrence WA5SWD Physical Address: 93 Spring Haven Dr., Oldtown, ID 83822 Mailing Address: Box 313 Priest River, ID 83856 Cell 970-481-4491 Home 208-437-1378 On Friday, February 26, 2016 6:21 AM, "twrch@... [hp_agilent_equipment]" wrote:
?
Dave,
I would replace the CCFL's first.? I've done this on R+S, Advantest, HP, Tektronix with great results.? Remove the old tubes, measure, find the appropriate replacement online (I typically find mine on ebay or one of the CCFL specialty sites online that can be found with a standard internet search) and place them in.? If your inverters are suspect, those should also be readily available.? $179.90 seems like a lot of money to pay for one of those new bright LCD displays when all you need is twenty dollars of CCFL. |
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Dave,
I would replace the CCFL's first.? I've done this on R+S, Advantest, HP, Tektronix with great results.? Remove the old tubes, measure, find the appropriate replacement online (I typically find mine on ebay or one of the CCFL specialty sites online that can be found with a standard internet search) and place them in.? If your inverters are suspect, those should also be readily available.? $179.90 seems like a lot of money to pay for one of those new bright LCD displays when all you need is twenty dollars of CCFL. |
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Re: Weinschel step attenuator gets stuck
Hello Tom,Page 207 for reloading constants from list previously recorded.I tried downloading a picture rastro_8593E_20160226.? Not sure if it got posted??I'll try attaching to this reply.
toggle quoted message
Show quoted text
On Friday, February 26, 2016 12:43 AM, "iphi@... [hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:
? Hi Rastro, many thanks for coming back on the HP8593E! So, you actually can change the leveling by entering new leveling information? I had a brief look at the calibration manual and I did see the sheets where to note down the measured levels. But I didn't find out what to do with those. I wonder if these measurements can be done with a little software via GPIB. Should be a lot more convenient. I have just uploaded a screenshot of the noise floor in the PHOTOS section, folder DG8SAQ. This was measured right after Instrument Preset. Can you please have a look if your noise floor looks similar, particularly that of the highest band in comparison to the previous ones. Could you possibly post a screenshot of your instrument's noise floor? Btw, where can this leveling info be read out or entered into the instrument? A page number in the manual would be of great help. About a month after purchase it went blind - backup battery died.Oh dear. I had assumed, my battery has long been dead without effect. It was last serviced in 1997. Is this a NiCd battery? The battery of my sweeper was dead, too, and the electrolyte was seeping out. I had taken the sweeper completely apart right after purchase, because I had to wash all components with ethanol to get rid of strong cigarette smell. The beast apparently came from the German army, which is a bunch of heavy smokers. So, I spotted the seeping battery and took it out without replacing it. I found it only buffers the GPIB address memory and I had no problem using the factory preset address only. I had assumed that the HP8593E would work in similar fashion without battery. I guess, I'll have to take it apart soon after all. Best regards, Tom DG8SAQ #yiv4959629144 #yiv4959629144 -- #yiv4959629144ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv4959629144 #yiv4959629144ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv4959629144 #yiv4959629144ygrp-mkp #yiv4959629144hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv4959629144 #yiv4959629144ygrp-mkp #yiv4959629144ads {margin-bottom:10px;}#yiv4959629144 #yiv4959629144ygrp-mkp .yiv4959629144ad {padding:0 0;}#yiv4959629144 #yiv4959629144ygrp-mkp .yiv4959629144ad p {margin:0;}#yiv4959629144 #yiv4959629144ygrp-mkp .yiv4959629144ad a {color:#0000ff;text-decoration:none;}#yiv4959629144 #yiv4959629144ygrp-sponsor #yiv4959629144ygrp-lc {font-family:Arial;}#yiv4959629144 #yiv4959629144ygrp-sponsor #yiv4959629144ygrp-lc #yiv4959629144hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv4959629144 #yiv4959629144ygrp-sponsor #yiv4959629144ygrp-lc .yiv4959629144ad 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Re: Spring loaded Old Style Front Panel Buttons
Hi Martin,
toggle quoted message
Show quoted text
The dimensions are critical, but easily done with a pair of scissors and an example spring. I made one by coloring in the spring stock with a magic marker pen, and carefully scribing the outline of the example spring. I then snipped it out using a pair of electrician's scissors.... and learned about the serrated edge. I ground the serrated edge from the spring with a diamond sharpening stone. The metal in an automotive "feeler gauge" has the proper temper. Somewhere in this group's archives is information about the proper thickness, and size. -Chuck Harris Martin.Hepperle@... [hp_agilent_equipment] wrote: Hi Chuck, |
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Re: 85685A in standalone mode and how it operates with the voltage input from SA
Vladan, ??????????????? thanks for the information that makes more sense from the description. I guess I could also have checked the schematic for the 8568B. since at least that exists. Tim From: "pianovt@... [hp_agilent_equipment]" To: hp_agilent_equipment@... Sent: Thursday, February 25, 2016 7:56 PM Subject: [hp_agilent_equipment] Re: 85685A in standalone mode and how it operates with the voltage input from SA
?
Tim,
HSWP is not an analog signal. It's one of the digital control lines on the 8566/8568 bus. Pulling the line low stops the analyzer sweep. This line is not normally available to the user, but for the preselector system it was brought out through a connector on an adapter that attached to the bus connector. Vladan >I had always assumed that the SA and Preselector used both HPIB and analog hswp voltage to coordinate tracking of filter. |
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Re: Spring loaded Old Style Front Panel Buttons
Hi Chuck,
thank you for sharing your experience. Indeed I found two of the springs, on the floor but the other one seems to be lost and not inside the box. As an interim solution I might try to make a coil spring. I understand that the length of the spring is critical and must be accurate. Regards, Martin |
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Re: Weinschel step attenuator gets stuck
Hi Rastro,
many thanks for coming back on the HP8593E! So, you actually can change the leveling by entering new leveling information? I had a brief look at the calibration manual and I did see the sheets where to note down the measured levels. But I didn't find out what to do with those. I wonder if these measurements can be done with a little software via GPIB. Should be a lot more convenient. I have just uploaded a screenshot of the noise floor in the PHOTOS section, folder DG8SAQ. This was measured right after Instrument Preset. Can you please have a look if your noise floor looks similar, particularly that of the highest band in comparison to the previous ones. Could you possibly post a screenshot of your instrument's noise floor? Btw, where can this leveling info be read out or entered into the instrument? A page number in the manual would be of great help. >About a month after purchase it went blind - backup battery died. Oh dear. I had assumed, my battery has long been dead without effect. It was last serviced in 1997. Is this a NiCd battery? The battery of my sweeper was dead, too, and the electrolyte was seeping out. I had taken the sweeper completely apart right after purchase, because I had to wash all components with ethanol to get rid of strong cigarette smell. The beast apparently came from the German army, which is a bunch of heavy smokers. So, I spotted the seeping battery and took it out without replacing it. I found it only buffers the GPIB address memory and I had no problem using the factory preset address only. I had assumed that the HP8593E would work in similar fashion without battery. I guess, I'll have to take it apart soon after all. Best regards, Tom DG8SAQ |
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Re: 85685A in standalone mode and how it operates with the voltage input from SA
Tim,
toggle quoted message
Show quoted text
HSWP is not an analog signal. It's one of the digital control lines on the 8566/8568 bus. Pulling the line low stops the analyzer sweep. This line is not normally available to the user, but for the preselector system it was brought out through a connector on an adapter that attached to the bus connector. Vladan I had always assumed that the SA and Preselector used both HPIB and analog hswp voltage to coordinate tracking of filter. |
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85685A in standalone mode and how it operates with the voltage input from SA
I was trying to understand the 85685A preselector better thinking it might be useful as a tuneable preamp without the SA. I have one which works but is a bit flakey probably due to sticky relays and at some stage will likely try to fix it. Unfortunately detailed repair/schematics etc was never released. I had always assumed that the SA and Preselector used both HPIB and analog hswp voltage to coordinate tracking of filter. The documents say: "The HSWP line enables the preselector to stop the spectrum analyzer
sweep momentarily in order to perform other functions. Once these
functions are completed, the sweep continues. This allows the
preselector to continue to sweep in sync with the spectrum analyzer." I assume that preselctor gets messages about the sweep range from the SA and then uses the hswp voltage from the SA to track the SA in realtime. That is, it knows the voltages for start and end of sweep and gets told what frequencies those points correspond to, depending on user settings. If it is preselector is changing ranges in mid sweep, then it must overide/overdrive the voltage sweep as described above?? Does anybody know if this is how it works? The programming manual does not mention the HSWP line so hard to know if you can program frequency ranges and then have a voltage controlled swept filter? Interested if anybody understands this and could share here. Thanks, Tim Hughes |
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Steve
¿ªÔÆÌåÓýHello Ed,I would like to have information about the keyboard and display you have used with the 8753D. Thanks. Steve, K8JQ
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Dr. David Kirkby (Kirkby Microwave Ltd)
<hp_agilent_equipment@...> wrote: Naturally you have to match the connectors for all external accessories.? Connect everything and look
I believe the 8753D uses a CRT - not an LCD. My 4291B impedance/material analyzer looks very similar to the 8753 / 8720 series, and is of the same sort of era, but the display is much better on that. But the 4291B, despite looking quite similar to an 8753, was not developed in the same division of HP, so they might well use different screens. The 8753s were developed in the USA, whereas the 4291B was developed in Japan. Dave |
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Re: HP 16505a and 16500b/c scsi interface
On Wed, Feb 24, 2016 at 9:20 PM, Glen Slick <glen.slick@...> wrote:
This is an example of what you can see in a listing window using the FuturePlus config and IA tools with an E2423A SCSI Bus Preprocessor on a 16700 series logic analyzer. I truncated most of the columns from the listing window and the output is probably still too wide to display correctly in email. I captured this today from the start of a bus trace while looking into some SCSI controller/device issues. State Number Time FUTUREPLUS SYSTEMS c 1999 DATA PHASE Decimal Absolute Phase SCSI mnemonic U3/160M REV 1.0 Hex Symbols ____________ ___________ ______________________________________ ____ ___________ 0 0 s Arbitrate ID=None 0000 ST_DATA_OUT 1 584.000 ns Arbitrate ID=07 0080 ST_DATA_OUT 2 600.000 ns Arbitrate ID=07 0080 ST_DATA_OUT 3 4.364 ms Select ID=00 0081 ST_DATA_OUT 4 4.405 ms SDat_O 81H DBP=1 0081 ST_DATA_OUT 5 4.406 ms Commd Start/Stop 001B COMMAND 6 4.408 ms Commd Lu=0 0000 COMMAND 7 4.409 ms Commd 0000 COMMAND 8 4.410 ms Commd 0000 COMMAND 9 4.411 ms Commd Make Unit Ready 0001 COMMAND 10 5.154 ms Commd 0000 COMMAND 11 5.277 ms Status Check Condition 0002 STAT 12 5.489 ms Msg_in Command Complete 0000 MSG IN 13 5.490 ms Bus Free 0000 MSG IN 14 6.448 ms Bus Free 0000 ST_DATA_OUT 15 6.452 ms Arbitrate ID=None 0000 ST_DATA_OUT 16 6.452 ms Arbitrate ID=07 0080 ST_DATA_OUT 17 6.452 ms Arbitrate ID=07 0080 ST_DATA_OUT 18 6.453 ms Select ID=00 0081 ST_DATA_OUT 19 6.455 ms SDat_O 81H DBP=1 0081 ST_DATA_OUT 20 6.456 ms Commd Start/Stop 001B COMMAND 21 6.457 ms Commd Lu=0 0000 COMMAND 22 6.459 ms Commd 0000 COMMAND 23 6.460 ms Commd 0000 COMMAND 24 6.461 ms Commd Make Unit Ready 0001 COMMAND 25 7.144 ms Commd 0000 COMMAND 26 7.267 ms Status Good 0000 STAT 27 7.480 ms Msg_in Command Complete 0000 MSG IN 28 7.480 ms Bus Free 0000 MSG IN |
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Re: BRIGHT Replacement LCD for 8753/8720 VNAs with dim LCD displays
Another option with the HP8753D is to use an external display, a fairly common PC display. I have used one for several years, and an external keyboard as well.? Both are easily available as PC items, older and inexpensive.? The PC keyboard takes most of the work out of labeling the display so the printed display is much better for your record keeping. Back to the PC video display.? Look at your 8753D manual and note the frequency of the sweep. It is lower than the spec's of many video displays so match this when you choose one.? Also check which of the three colors carries the sync signal.? That is critical. Naturally you have to match the connectors for all external accessories.? Connect everything and look at the display.? It probably it needs the Horizontal width adjusted.? Display a Smith Chart and adjust the width until it is round.? Easy! I can go check which display and keyboard I am using if there is any interest in this addition.? ? Ed Lawrence WA5SWD Physical Address: 93 Spring Haven Dr., Oldtown, ID 83822 Mailing Address: Box 313 Priest River, ID 83856 Cell 970-481-4491 Home 208-437-1378 On Wednesday, February 24, 2016 7:54 PM, "ovidiu.popa@... [hp_agilent_equipment]" wrote:
?
Unfortunately the SimmConn kits are not designed to replace the 8753D/E displays. |
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Re: Weinschel step attenuator gets stuck
Hello Tom, I also have a HP8593E - a little over a year now.? I really like it.? About a month after purchase it went blind - backup battery died.? I'm just glad it was not a blown front end.? Anyway I had to re-accomplish the leveling calibration points - over 100 points.? In retrospect, when I first got it , I should have gone through the procedure that records all these points then it just would have been a matter of reentering them from a hard-copy record.? Regards rastro On Thursday, February 25, 2016 8:45 AM, "iphi@... [hp_agilent_equipment]" wrote:
?
Hi Ian,
many thanks for the warm welcome. Now it's over with being incognito ;-) I'm trying to get into the high GHz field using high notch second hand HP equipment. Here's my complete HP inventory for the records: HP425A (excellent uV meter with valves, that I could rescue from junk and fix it successfully) HP3430A (DVM, also rescued from junk, nice, but a bit bulky, not used lately) HP34401A (impressive 6.5 digit multimeter, purchased recently) HP8350B+HP83529A (cool sweeper 10MHz...20GHz, purchased recently. I'm using it a lot. Quite instructive to see how various coax cables behave at 18GHz.) HP8593E (my latest purchase, 26.5GHz SA to replace a borrowed HP8591A). I might need advice on the HP8593E soon when I have time to take care. I have the impression that the highest band (19GHz...26GHz) shows 10dB to low amplitudes, verified with the sweeper as signal source up to 20.4GHz and double-checked against a Gigatronics power meter, which nicely matches the HP83529A output power display within a few tenths of a dB). The noise floor of that band displays 5dB lower that that of the previous band. I would have expected it to be 5dB higher than that of the previous band as harmonic mixing gets increasingly less efficient at higher harmonics. I wonder if this can be fixed with a software setting. Best regards, Tom DG8SAQ |
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Re: Part Needed
Joe, drop me a private post. If you can wait 3+ weeks until I can access my lab. Ill look to see if I have any AVANTEK GPDs of the correct spec. Ill send you one free if I do....Im really not certain if I have any of them left.
Im on holiday (vacation) in Malaysia at present and home is UK Pete G4GJL |
Pete_G4GJL
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