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
- TekScopes
- Messages
Search
|
Re: Birdies on a 492....what's normal?
John Miles
Not sure I've ever seen those options mentioned, but the minimum discernible
toggle quoted message
Show quoted text
signal should be in the specs. The noise floor of a 49x in 100 Hz RBW is around -125 dBm in band 1. The 8640B goes down to -139 dBm, so it may be time to tighten up a few connectors in the 8640B if you can still see it! (Either that, or perhaps those option codes refer to some kind of internal preamp. Would be interesting to know for sure... Deane and Stan, have you ever heard of those?) I recently posted the TekScopes issue announcing the 492 for another fellow; it's still on my web space, and will be for a few days (until I need the space back), if you or anyone else would like to grab a copy: It's about 12 MB, not a great scan for browsing but looks OK when printed. -- john, KE5FX My 492 has mod UB and kit KE/FE installed. Would you happen to know |
|
Re: Birdies on a 492....what's normal?
Chris Johnson
I'm still learning my way around the groups. I may have sent replies
to individuals rather than the group. Sorry about that. I went inside and checked all the cabling and found a few connections that were a bit loose. Most of them were push-on SMB connections. After tightening them all up, all the birdies flew away. :) My 492 has mod UB and kit KE/FE installed. Would you happen to know what those are? What's the lowest power signal that this should be able to resolve at minimum span, max resolution, and with the minimum noise filter engaged and with video filtering set to narrow? I'm asking because whatever it is, my HP 8640B won't go that low, even at its -130dBM range with the vernier turned down all the way. I'm impressed! CJ |
|
Re: TR501 vs. TR502
Gregor,
With the exception of the stop sweep circuitry, a TR 501 is identical to a TR 502. The TR 501 was actually intended to be used with the 7L12. The stop sweep feature only works with the more stable 7L13 or 7L14. A typical configuration is a 7L13 Spectrum Analyzer, TR 502 Tracking Generator, DC 508A/07 1.3 GHz Frequency Counter and a TM 503/07 Power Supply. The combination stops the spectrum analyzer sweep to allow the frequency counter to count the tracking generator frequency at the center frequency that the spectrum analyzer is tuned to. When the counter has finished counting the center frequency, the sweep continues to the right of the center frequency. You can do something somewhat similiar using a 7L12, TR 501, DC 50x (or any high frequency frequency counter), and a TM 503. You use the analyzer's manual sweep mode and tune the spectrum analyzer sweep to the frequency of interest. With counter connected to the auxiliary output of the TR 501 it will count the tracking generator frequency at whatever point the spectrum analyzer sweep is manually tuned to assuming the 7L12, and TR 502 are properly synchronized. You can also use the zero span mode which stops the sweep at the center frequency as well. It is very helpful to have a frequency counter connected to the tracking generator's auxiliary output. Rather than being limited by the 7Lxx spectrum analyzers' readout accuracy of 1 MHz or less, you can determine the exact frequency that the analyzer is tuned to easily. Brian, WB6QED |
|
TR501 vs. TR502
Gregor Lasser
Hi!
I'm looking for a TR502 tracking generator for my 7L12 for a long time now, but now I found an ebay offer for a TR501 that seems to have the same functionality. Is that correct, or what are the differences between TR502 and TR501? On an internet page I found the hint "Tektronix TR501 tracking generator 100kHz-1.8GHz for 7L12 (no sweep stop)" But what is this sweep stop functionality? Regards Gregor, OE1GLC |
|
465M ?
Charles A. Pratt
I have a question on the power supply replacement of the caps on the 5V
side the Negative polarity is reversed on the - 5 side? The old caps are not marked and I figured it out from the shield being insulated on the -5V side. If anyone has a schematic of the PSU it would be great! Charles |
|
7D02 Logic Analyzer
Paul Anderson
I have a Tektronix 7603 mainframe, with a 7D02 logic analyzer plugin.
Unfortunately, I don't have any probes, personality modules or manuals. I'm not really what constitutes normal behaviour when you just turn it on or not, so I'm wondering if it's seriously unhealthy. When I turn the scope on, the screen fills with nines and underscores, like this: 9_9_9_9_9_ 9_9_9_9_9_ 9_9_9_9_9_ The longer the scope is on, some of the 9's will start changing into other characters like semicolons and equal signs. It almost seems like I'm looking at a memory dump? Does anyone have any thoughts on the meaning of this output? -- Paul Anderson VE3HOP wackyvorlon@... "May the electromotive force be with you." |
|
Re: Replacement to DS1230AB Lithium backed NVRAM
"John Miles" <jmiles@...> wrote:
Sounds like the whole RAM is battery-backed, not just the address space usedIt wouldn't be the first time something like that has been done: Not Dallas, but it's the same idea. -ls- |
|
Re: Replacement to DS1230AB Lithium backed NVRAM
John Miles
Sounds like the whole RAM is battery-backed, not just the address space used
toggle quoted message
Show quoted text
to hold calibration constants and instrument state. Is it practical to Dremel the Dallas part open and replace its integral lithium cell with an outboard cell? -- john, KE5FX I have found that the FRAM devices are not a viable option in the |
|
Re: Replacement to DS1230AB Lithium backed NVRAM
I have found that the FRAM devices are not a viable option in the
243X/40. Sadly I must report that what looked like a very promising alternative to the DALLAS RAM/Lithium cell combo has turned out to be a dead end. I have been testing for over one month now on a 2430A, 2440 and 2465B and everything seemed fine. My last test was to actually determine the read/write frequency to the device. It turn out a 2430A writes to the battery-backed devices as often as once every microsecond. Since the FRAM device as a maximum of 10^10 read/write cycles (before it loses its NV capability) a quick calculation reveals that the 2430A scope will render the FRAM device a volatile device in one to three months. For now I can only recommend the DALLAS (or other vendors) RAM/Lithium cell combo pack device for use in Tek scopes. Sorry for getting everyone's hopes up for a more inexpensive replacement for NVRAM. --Victor Silva |
|
1S2 Sampling Unit and TDR Manual to a good home
Dennis Tillman
Hi everybody,
I have a genuine original Tek 1S2 manual (070-0889-00, no serial number). Cover page says Copyright 1966, new material copyright 1968 so it probably covers many instruments. No additional changes are shown in the back of the manual. No serial numbers indicated on the schematic pages so it appears to cover all the 1S2s made up through 1968. About 1" (25mm) thick Also included is a xerox copy of Tek Service Scope Aug 1967 article on TDR using the 1S2. First one to claim it gets it. Domestic shipping will be via UPS Ground. No other charges for packing. Flat feee for shipping to anywhere in the US is $8.00 (unless you will be picking it up in person). Overseas shipping costs via the USPS are anybody's guess. NON-DISCLAIMER: I have a 100% financial interest in the disposition of this item :) Dennis Tillman Silicon Designs, Inc. 1445 NW Mall Street Issaquah, WA 98027-5344 dennis@... www.silicondesigns.com 425-391-8329 Voice 425-391-4077 FAX |
|
Re: Acquisition of 535A and 581 - info for a 7000-er?
arthurok
the 535a is a fine choice as a general purpose lab scope
toggle quoted message
Show quoted text
if 15 mhz will do it. im a bit down on the 545a because of its 4 cm verticle height + very complex vert delay line as a plug in tester i think that it will test any letter and number plug ins if 15 mhz will do you ----- Original Message -----
From: Bill R Cc: TekScopes@... Sent: Thursday, February 01, 2007 7:43 PM Subject: Re: [TekScopes] Acquisition of 535A and 581 - info for a 7000-er? Christian, BAMA has the 585 manual. A 581 is like a 585 but has only one timebase. The vertical amps will be the same, and the power supplies will be very close. The one sweep on the 581 will be the same as "A" sweep on the 585. Right: To use letter series plug-ins with a 581 you need an adapter plug-in, type 81. The plug-in of choice for the 581 is the type 82, a dual channel. Single channel is type 86. Both 581 and 585 came in "A" versions. Good luck! Bill R Christian A Weagle wrote: > Good day, > > A friend of mine has offered me two tube scopes of unknown provenance, > he believes however that they are not working. They are > > Type 581 Serial #001067 > Type 535A Serial #025668 > > BAMA has provided me with manual for the 535A (even seems to be the > right vintage), but I came up short on the 581 - any pointers? I > don't know what/if any plugins will be coming (the scopes are > currently a long way away from both of us). > > This will be my first foray into the earlier offerings from Tek. I > understand that both of these scopes will use letter and 1-series > plugins, the 581 needing the 81 adapter. Any other gotchas? I will > of course peruse the archives, but I would welcome any tips useful to > someone used to working on 7000-era gear. Ahh, yes, I know that the > voltages tend to be a bit higher, and that I probably could stand to > get a 100x probe! > > > > > Yahoo! Groups Links > > > > > > |
|
Re: Acquisition of 535A and 581 - info for a 7000-er?
faustian.spirit
--- In TekScopes@..., Bill R <bill1904@...> wrote:
timebase. The vertical amps will be the same, and the power supplies will be verySo what is your total cost for these (even if they are for free, shipment or petrol costs...)? "Non working" could mean one or more of the following faults, which WILL require either unusual spare parts or workarounds: CRT gassy or out of geometry. Defective mains transformer (mainly heater winding insulation). Defective EHT transformer (people have probably talked up a book about that here). Defective time relay (not easily obtained). Several capacitors leaky (depends on the brand and charge used at time of production it seems). All kinds of fan trouble (stuck fans, worn bearings, inoperative motors, soccer hooligans...). Some other things I have not thought of. Also see the advice I solicited here a few weeks ago about bringing up a 500 series (a 555 in that case, which I have since then powered up but not gotten completely operational yet...)
|
|
Re: Acquisition of 535A and 581 - info for a 7000-er?
Bill R
Christian,
toggle quoted message
Show quoted text
BAMA has the 585 manual. A 581 is like a 585 but has only one timebase. The vertical amps will be the same, and the power supplies will be very close. The one sweep on the 581 will be the same as "A" sweep on the 585. Right: To use letter series plug-ins with a 581 you need an adapter plug-in, type 81. The plug-in of choice for the 581 is the type 82, a dual channel. Single channel is type 86. Both 581 and 585 came in "A" versions. Good luck! Bill R Christian A Weagle wrote: Good day, |
|
File - Posting Rules
Please edit any posts/replies to the list to
minimize quoted material to that required for continuity. Please do not send personal replies to the list. List replies go to the original sender by default. If you want to also reply to the list, use Reply-to-all (or whatever it's called in your mailer), or manually add the TekScopes address. Do this if your reply would be of interest to the list. Otherwise, just reply to the sender. Those congesting the list with with either of the above may have posting rights revoked. Only by following these simple rules will we have a "clean" archive. They also reduce inbox clutter, make digests much nicer to read, improve searches, and reduce the chance of having old messages deleted. To post to the group, mail to: TekScopes@... I occasionally get emails meant for the group mistakenly sent to TekScopes-owner@...! I just delete these, so please watch where you're sending... If you post or have posted to the Photos section, please make sure your files are fairly small (<100K). See the bottom of this message for further instructions. If you do not wish to belong to TekScopes, you may unsubscribe by sending an email to TekScopes-unsubscribe@... You may also visit the Yahoo web site to modify your subscription: Check out the files, links, and photos sections, and remember, you can search the group's archives from its home page, or when reading messages. The group's home is at: Regards, Michael Dunn Listowner, TekScopes Keeping Photos Small: There's no point uploading large images to the photos section, as Yahoo severely limits the size and quality that others can view them at. I reserve the right to delete oversize files without warning. Therefore: I would ask anyone who has uploaded large (>100K) files (you can see file sizes by selecting list instead of thumbnail view) to either: 1. Delete the full-sized version via Yahoo by first viewing it. There is then a link (top-center) that allows deletion. 2. Replace it with a reduced-size version. 3. Delete it. |
|
slightly OT: HP 3589A Spectrum / Network Analyzer: Trace Math syntax
martin_u_fischer
Hello TekScope Community,
apologies for the slightly OT; please admit the following questions: I am looking for informations about Trace Math in the HP 3589A Spectrum / Network Analyzer. The Product Data Sheet merely mentions some characteristics of this feature. The HP 3589A Operator?s Guide downloaded the from the Agilent website doesn?t even mention this feature. Does anybody have any further informations about or experience with Trace Math syntax in this Model? Or do I miss a dedicated manual covering this topic? Any hint will be highly appreciated. Regards Martin mailto:Martin.Fischer@... |
|
Re: Birdies on a 492....what's normal?
John Miles
There should be no birdies whatsoever except for the big one at 0 Hz. You
toggle quoted message
Show quoted text
have a problem (possibly bad cabling in the front end, although what local signals would be coming through at 41 MHz and 300 MHz, I don't know...) Interrupt the RF signal path (as recommended in my earlier reply) until you see where they're coming from. -- john, KE5FX -----Original Message----- |
to navigate to use esc to dismiss