Hmm, as in no longer heating? That would make sense. Is there a common failure mode?
I'll de-rack it over the weekend.
-Dave
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On 9/11/20 5:44 PM, John Ackermann N8UR wrote: For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire <mcguire@... <mailto:mcguire@...>> wrote:
I have a 5061A Cs-beam oscillator that was working great, in very
occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz
oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator
frequency adjustment down. It hit the end of its travel with the
oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what
may have happened to the oscillator? I had been performing flawlessly
until now, but I'd not checked its output in probably nine months, so I
don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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For that big an offset, I'd suspect the oven in the OCXO.
John
On Sep 11, 2020, at 5:41 PM, Dave McGuire < mcguire@...> wrote:
I have a 5061A Cs-beam oscillator that was working great, in very
occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz
oscillator, with the loop open, in "Cs off" mode, was about 100Hz high.
I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator
frequency adjustment down. It hit the end of its travel with the
oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what
may have happened to the oscillator? I had been performing flawlessly
until now, but I'd not checked its output in probably nine months, so I
don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
|
I have a 5061A Cs-beam oscillator that was working great, in very occasional use. One day recently it refused to lock.
A quick glance through the important stuff showed that the 5MHz oscillator, with the loop open, in "Cs off" mode, was about 100Hz high. I believe this is well outside the PLL capture range.
Not stopping to think much, I cranked the coarse 5MHz oscillator frequency adjustment down. It hit the end of its travel with the oscillator's output still being 40Hz high.
Before I start digging in, can anyone offer any thoughts as to what may have happened to the oscillator? I had been performing flawlessly until now, but I'd not checked its output in probably nine months, so I don't know if the frequency drifted high, or if it "jumped".
Any advice or thoughts on this would be greatly appreciated.
Thanks,
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Re: OT (just a bit) - Centralab Steatite Switches
This is the range switch for a VTVM so I presume high impedance is needed. Phenolic might work but then someone might go in there and spray it with "contact cleaner" and I don't think that would be good on phenolic. Electroswitch has started making those wafers out of glass epoxy and I think that would be a reasonable substitute and I can find new, exact replacements.
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Ed Breya via groups.io" <edbreya@...>
To: [email protected]
Sent: Friday, September 11, 2020 3:47:01 PM
Subject: Re: [HP-Agilent-Keysight-equipment] OT (just a bit) - Centralab Steatite Switches
Does it have to be the ceramic type wafer? You may find more options if
phenolic is OK.
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What is the max DC voltage you can have on the RF Output Connector ?
And, no, I haven't done that, yet. Just curious.
73, Dick, W1KSZ
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Re: Hp8566B DLP installation from windows PC
On Fri, Sep 11, 2020 at 02:25 AM, brian.flynn wrote:
Note:
These files worked on my 8566B (serial # 2332A) with the exception of the
waterfall display. It comes back with an error message:
"INVALID STORE DEST: W_LOOP? SRQ 140". W_LOOP seems to be defined in the code
but I do not have experience of HPIB/GPIB programming to debug. Any helpful suggestions
gratefully received!
Brian, Thank you for creating and uploading the Windows *.bat files so people can download these DLPs from their PC's. The error you are getting seems to indicate that the W_LOOP variable was NOT defined when the DLP is executed. The SRQ 140 error indicates that W_LOOP is undefined (as a recognizable command/variable). I assume you tried downloading the DLP again to ensure that it wasn't just a one of. Since the W_LOOP variable definition is the very first line in the water_8566B_8568B.bat's outputting to the GPIB, I'm wondering if somehow it is/was NOT getting successfully sent. I would try adding a new line before the "VARDEF W_LOOP,0;" line, something like "VARDEF W_TEMP,0;".? Since that new line would now be the first line sent, I would hope that the W_LOOP definition line would be now seen. This is just a guess about the first line being lost/garbled.? Let me know what you see.? You can send a private e-mail to me if you want. -- rmb_guru (I'm the one who wrote these DLP's while working as a Software Engineer on the HP8566 Production line at HP and uploaded the source to this group's file region)
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Re: OT (just a bit) - Centralab Steatite Switches
Does it have to be the ceramic type wafer? You may find more options if phenolic is OK.
|
Re: HP 89410A / 89441A internal 3 1/2 floppy replacement
Hi Roy,
Pretty sure, when you connect the original disk up to the interface it blows a 2A SMD fuse on the Memory / controller card in the instrument (A42).??
I had a quick probe around on the original disk and there is nothing obviously wrong with it (shorted caps etc.)
You are right though, I might give it a more thorough inspection to try to see what the issue is.? It seems like the fuse blows as soon as the drive head tries to seek so perhaps it is an issue with the positioning motor or its driver.
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Re: HP 8593e alimentation A8
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On Thu, Sep 10, 2020 at 10:54 PM, <on4lj@...> wrote:
JOHN,
sorry but I can not find the db37 connector it is well at ko4bb that you put it or elsewhere?
thank you
JOEL
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Hewlett Packard 5335A Universal Frequency Counter Fail Massage 5.1
Hello Everyone I have a Hewlett Packard 5335A Universal Frequency Counter
With Fail Massage 5.1 when Powered on, according to the manual it is
Start Interpolator Problem, I have tried to trace the problem but no luck
I hope that some one has some experience with this counter and can
Point me in the right direction Thank You I am looking forward to hear
from a knowledgeable individual that is more knowledgeable I
Thank You
Sal C. Cornacchia
RF Microwave Engineer (Ret.)
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Re: HP 89410A / 89441A internal 3 1/2 floppy replacement
On Fri, Sep 11, 2020 at 03:54 AM, Peter Brown wrote:
I have an 89410A VSA that needs a replacement 3.5 inch floppy drive
Hi Peter: R U sure that the floppy disk drive is bad?
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Re: InfiniiVision 1000 X-Series Oscilloscopes
Chuck,
FYI - It appears that this poster (Carl Moon) is the Original Poster/spammer. ?
Be aware of it's apparent agenda. ?
Ben
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Re: 3582A troubleshooting
On 9/10/20 9:54 PM, Mark Litwack wrote: Another gadget to trace shorted circuit current is the Aim-TTi I-prober 520.? It has a tiny fluxgate magnetometer in the tip to detect the magnitude and direction of magnetic fields, DC to 5MHz.
By injecting a known signal on the shorted circuit, it's easy to trace the path by watching for the signal on a scope.? It can sometimes be a bit noisy though, in which case the scope needs to be triggered in sync with the injected signal and waveform averaging turned on.? I've been able to track shorts down to individual pins on SOIC chips.
Unfortunately the I-prober is not cheap, but they do have other uses, like being a regular DC current probe. I would be all over that if it weren't...jeeze, $800. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: 3582A troubleshooting
Mike Harrison did an interesting article on the i-prober. I was especially impressed by the hack he develops in the last couple of minutes on the video, which gives a crude spatial image of the current flows. That would entirely be worth developing further.
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I'm not sure I'm quite ready to say that there are no hardware problem, but it could be a software issue.
One of the thing you could try is to boot on the recovery partition and recover your OS. Prior to do this, you should make a copy of your HDD on a secondary drive. I don't mean a copy paste of windows, I really mean a duplicate drive. I did it using UBCD, it's quite easy and is definitely worth it (be careful not to wipe the scope HDD)! Of course test your duplicate. Then just boot on the recovery and try to run the cal in recovery, it might work. If not, recover the primary partition. If this doesn't work, reinstall the scope software, I doubt that it will work, but it's simple enough that it's worth trying.
You only have the Probe board that fail at the moment, I'm a bit surprised, I would have expected something closer to the ADC. I think you should follow the troubleshooting procedure in the service manual to find the issue.? It could very well be a unconnected cable. When I received mine, I had a similar issue (I had traces on all channels) and the issue was a connector plugged at the wrong place.?
I would be curious on seeing what the wave looks on the defective channel. Is it that the ADC is saturated, is it that the display overlay shoots nothing or something else. What happens when you try to measure something on that waveform? On other waveform?
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Re: InfiniiVision 1000 X-Series Oscilloscopes
Have you even read this thread?
Try doing so, you might be enlightened.
-Chuck Harris
Carl Moon via groups.io wrote:
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Calling to ban a person simply because you do not agree with him on how he should
post is rather simplistic. I think we should learn to tolerate each other.
Carl
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Re: HP 8593e alimentation A8
OK George thank you for the information. Thank Joel ? ? ? Hi Joel
Sorry you misunderstood what I was saying, I don;t have a spare supply for sale. What I meant was I have one that I can give you information from.
Good luck with the repair, it should be a simple one, the problem comes with the smaller SMD control board, but this looks like it is working OK. Standard fault with these supplies is that they will not turn on at all.
George G6HIG Dover UK On Friday, 11 September 2020, 08:39:33 BST, <on4lj@...> wrote: well received George, ? thank you for the proposal of the power supply unit but I will first see if I can troubleshoot mine thank you for the info. ? Joel ON4LJ ? ? Hi Joel
Although the attached circuit diagram is for a different SA PSU you should be able to use it for yours. The 37pin D connector pins are on the right of the first drawing.
If you have any problems I do have a 8593 PSU that I can check for you.
Yell if you have problems.
George G6HIG Dover UK On Friday, 11 September 2020, 06:57:42 BST, <on4lj@...> wrote: OK George,
thank you for you information for me
tkank
joel
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HP 89410A / 89441A internal 3 1/2 floppy replacement
Hi All,?
I have an 89410A VSA that needs a replacement 3.5 inch floppy drive.?
It seems like the correct drive is a very specific skew that has a pin out that differs significantly from a 'regular' PC drive (e.g. the drive is powered over the 34 pin ribbon cable with +5V expected on pins 7,9 and 11)
The part number for the original drive is? EPSON SMD 340-006-02
Does anyone have experience with replacement of drives in these VSAs??
I have found a drive that has pins 7, 9 and 11 on a separate trace that can be configured either as ground (regular PC pin out) or can be routed to the +5V rail using soldered jumpers.
This drive is a Sony MPF920-E/131
Does anyone have a schematic for this Sony drive that would allow me to determine the function of the various soldered jumpers on the board?
The controller used by the Sony drive is a CXA8061Q
Does anyone have a datasheet for this controller that shows pin function?
Thanks in advance
Peter
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Re: InfiniiVision 1000 X-Series Oscilloscopes
Calling to ban a person simply because you do not agree with him on how he should post is rather simplistic. I think we should learn to tolerate each other.
Carl
|
Hp8566B DLP installation from windows PC
I have uploaded a set of five? *.bat files to install the default set of DLPs in HP8566B/8567b/8568B
spectrum analysers from a windows PC.
/g/HP-Agilent-Keysight-equipment/files/8000%20to%209999/8566%20B,67%20A,68%20B%20Spectrum%20Analyzers.%20DLPs%28Down%20Loadable%20Programs%29%20and%20Tools
To use them you must have the John Miles's, KE5FX GPIB toolkit installed and either a NI or
Prologix GPIB adapter. The toolkit is available at
?
http://www.ke5fx.com/gpib/readme.htm
To run the files to install the DLPs, simply copy the files into the folder containing the toolkit
(Default location:? C:\Program Files (x86)\KE5FX\GPIB ). To upload the GPIB programs
simply doubleclick on each of the *.bat files in turn. These call John's utility? "talk.exe" to
do the magic and upload the HPIB/GPIB code.
The files in the folder are
README.txt
harm_8566B_8568B.bat
intro_8566B_8568B.bat
main_menu_8566B_8568B.bat
peaks_8566B_8568B.bat
water_8566B_8568B.bat
There is also another bat file already in the toolkit? IMD_8566B_8568B.bat, which can also be used .
Note:
These files worked on my 8566B (serial # 2332A) with the exception of the
waterfall display. It comes back with an error message:
"INVALID STORE DEST: W_LOOP? SRQ 140". W_LOOP seems to be defined in the code
but I do not have experience of HPIB/GPIB programming to debug. Any helpful suggestions
gratefully received!
73s
Brian Flynn GM8BJF
11 Sept 2020
|
Dave McGuire
rmb_guru